Aluminum component to be brazed and method for producing a brazed body

Abstract

An aluminum member to be brazed, characterized in that it is brazed with a member formed of a brazing plate, two or more grooves are provided on the surface of the aluminum member to be brazed in the area where the fillet is formed, the groove depth (D1) of the groove is 0.005 to 0.50 mm, the groove width (W1) of the groove is 0.005 to 0.50 mm, the ratio (W1 / D1) of the groove width (W1) to the groove depth (D1) is 10.00 or less, and the interval (P1) between adjacent grooves is 0.00 to 0.30 mm. According to the present invention, an aluminum alloy material and a method for manufacturing a brazed body can be provided, which can ensure good brazing properties even if the gap between the members to be joined is large when brazing an aluminum material without using a flux.

Description

Technical Field

[0001] The present invention relates to an aluminum member to be brazed for brazing an aluminum material without using a flux. Background Art

[0002] Brazing is widely used as a method for joining products with a large number of joints, such as aluminum heat exchangers and mechanical parts. In order to braze aluminum materials (including aluminum alloy materials), the oxide film covering the surface must be destroyed and the molten brazing material must be brought into contact with the base material or the same molten brazing material. In order to destroy the oxide film of aluminum materials, there are two methods: using flux and heating in a vacuum, both of which have been put into practical use.

[0003] Brazing has a wide range of applications. The most representative example of brazing is automotive heat exchangers. Radiators, heaters, capacitors, evaporators and other automotive heat exchangers are basically made of aluminum and are basically brazed. Among them, the method of applying non-corrosive flux and heating in nitrogen currently accounts for the majority.

[0004] However, in the flux brazing method, the cost of flux and the process of applying flux are huge, which has become a factor in increasing the manufacturing cost of the heat exchanger. There is also a method of manufacturing heat exchangers by vacuum brazing, but the equipment cost and maintenance cost of the heating furnace of the vacuum brazing method are high, and there are also problems in productivity and brazing stability. Therefore, there is an increasing demand for brazing joints in a nitrogen furnace without using flux.

[0005] In order to meet this demand, Patent Document 1 proposes that surface bonding can be achieved by including Mg in the brazing material. In addition, Patent Document 2 proposes the following method: Mg is included in the core material, and Mg is diffused into the brazing material during brazing heating. It is disclosed that the formation of an oxide film on the surface of the brazing material during the manufacture of the coating material and brazing heating is prevented, and Mg effectively acts on the surface of the brazing material to destroy the oxide film. In addition, Reference Document 3 proposes the following method: grooves are provided in the core material of the brazing plate and the brazing portion of the brazed component to improve the brazing performance.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2013-215797

[0009] Patent Document 2: Japanese Patent Application Publication No. 2004-358519

[0010] Patent Document 3: Japanese Patent No. 2014-226704 Summary of the invention

[0011] Problem that the invention aims to solve

[0012] However, in the case of brazing without flux, in the method of making the brazing material contain Mg or making the Mg added to the core material diffuse in the brazing material as in Patent Documents 1 or 2, if the gap between the members to be joined is large, such as the joining of the top plate and the tube, there is a problem that the brazing material is not wettable and diffusible to the end face of the brazing plate (core material, intermediate material or sacrificial anode material), the surface of the core material and the brazed surface of the brazed member during brazing heating, and good brazing properties cannot be ensured. In addition, even if a groove is provided in the brazing portion of Patent Document 3, there is a problem that good brazing properties cannot be ensured when the gap between the members to be joined is large.

[0013] Therefore, an object of the present invention is to provide an aluminum material and a method for producing a brazed body that can ensure good brazing properties even when a gap between members to be joined is large when brazing an aluminum material without using flux.

[0014] Solutions for solving problems

[0015] The above-mentioned problems are solved by the following present invention.

[0016] That is, the present invention (1) provides an aluminum component to be brazed, characterized in that it is to be brazed with a component formed of a brazing plate, the brazing plate having at least: a core material formed of an aluminum alloy; and a brazing material formed of an aluminum alloy containing 3.00 to 13.00 mass % of Si and 2.00 mass % or less of Mg (excluding zero), the balance of which is aluminum and inevitable impurities,

[0017] On the surface of the aluminum component to be brazed, there are two or more grooves in the area where the weld fillet is formed, the groove depth (D1) of the groove is 0.005 to 0.50 mm, the groove width (W1) of the groove is 0.005 to 0.50 mm, the ratio (W1 / D1) of the groove width (W1) to the groove depth (D1) is less than 10.00, and the interval (P1) between adjacent grooves is 0.00 to 0.30 mm.

[0018] In addition, the present invention (2) provides an aluminum component to be brazed, characterized in that it is to be brazed with a component formed of a brazing plate, the brazing plate having at least: a core material formed of an aluminum alloy; and a brazing material formed of an aluminum alloy containing 3.00 to 13.00 mass % of Si and 2.00 mass % or less of Mg (excluding zero), the balance of which is aluminum and inevitable impurities,

[0019] A main groove and two or more sub-grooves arranged at the groove bottom of the main groove are provided on the surface of the weld fillet forming area of ​​the aluminum component to be hard-brazed, the groove depth (D2) of the sub-groove is 0.005 to 0.50 mm, the groove width (W2) of the sub-groove is 0.005 to 0.40 mm, the ratio (W2 / D2) of the groove width (W2) of the sub-groove to the groove depth (D2) of the sub-groove is less than 10.00, and the ratio (D2 / D3) of the groove depth (D2) of the sub-groove to the groove depth (D3) of the main groove is greater than 0.50 and less than 1.00.

[0020] In addition, the present invention (3) provides an aluminum component to be brazed as described in (1) or (2), characterized in that the aluminum alloy forming the aforementioned aluminum component to be brazed is an aluminum alloy containing any one or more of 1.50 mass% Si, 1.00 mass% Fe, 1.20 mass% Cu, 2.00 mass% Mn, 3.00 mass% Mg, 8.00 mass% Zn, 0.30 mass% Cr, 0.30 mass% Ti, 0.30 mass% Zr, 0.10 mass% In, 0.10 mass% Sn, 1.00 mass% Bi, 0.05 mass% Na, 0.05 mass% Sr and 0.05 mass% Sb, and the balance is composed of aluminum and unavoidable impurities.

[0021] In addition, the present invention (4) provides an aluminum component to be brazed according to any one of (1) to (3), characterized in that the brazing material of the brazing plate further contains any one or more of 1.00 mass% Bi, 1.00 mass% Fe, 1.20 mass% Cu, 2.00 mass% Mn, 8.00 mass% Zn, 0.30 mass% Cr, 0.30 mass% Ti, 0.30 mass% Zr, 0.10 mass% In, 0.10 mass% Sn, 0.05 mass% Na, 0.05 mass% Sr and 0.05 mass% Sb.

[0022] In addition, the present invention (5) provides an aluminum component to be brazed according to any one of (1) to (4), characterized in that the core material of the aforementioned brazing plate is an aluminum alloy containing any one or more of 1.50 mass% Si, 1.00 mass% Fe, 1.20 mass% Cu, 2.00 mass% Mn, 3.00 mass% Mg, 8.00 mass% Zn, 0.30 mass% Cr, 0.30 mass% Ti, 0.30 mass% Zr, 0.10 mass% In, 0.10 mass% Sn, 1.00 mass% Bi, 0.05 mass% Na, 0.05 mass% Sr and 0.05 mass% Sb, with the balance consisting of aluminum and unavoidable impurities.

[0023] In addition, the present invention (6) provides a method for manufacturing a brazed body, characterized in that the method comprises assembling a member formed of a brazing plate and an aluminum member to be brazed, and then performing brazing heating without using a flux, thereby manufacturing the brazed body.

[0024] The brazing material of the brazing sheet is formed of an aluminum alloy containing 3.00 to 13.00 mass % of Si and 2.00 mass % or less of Mg (excluding zero), and the balance is aluminum and inevitable impurities, and the core material is formed of the aluminum alloy.

[0025] On the surface of the aluminum component to be brazed, there are two or more grooves in the area where the weld fillet is formed, the groove depth (D1) of the groove is 0.005 to 0.50 mm, the groove width (W1) of the groove is 0.005 to 0.50 mm, the ratio (W1 / D1) of the groove width (W1) to the groove depth (D1) is less than 10.00, and the interval (P1) between adjacent grooves is 0.00 to 0.30 mm.

[0026] In addition, the present invention (7) provides a method for manufacturing a brazed body, characterized in that the method comprises assembling a member formed of a brazing plate and an aluminum member to be brazed, and then performing brazing heating without using a flux to manufacture the brazed body.

[0027] The brazing material of the brazing sheet is formed of an aluminum alloy containing 3.00 to 13.00 mass % of Si and 2.00 mass % or less of Mg (excluding zero), and the balance is aluminum and inevitable impurities, and the core material is formed of the aluminum alloy.

[0028] A main groove and two or more sub-grooves arranged at the groove bottom of the main groove are provided on the surface of the weld fillet forming area of ​​the aluminum component to be hard-brazed, the groove depth (D2) of the sub-groove is 0.005 to 0.50 mm, the groove width (W2) of the sub-groove is 0.005 to 0.40 mm, the ratio (W2 / D2) of the groove width (W2) of the sub-groove to the groove depth (D2) of the sub-groove is less than 10.00, and the ratio (D2 / D3) of the groove depth (D2) of the sub-groove to the groove depth (D3) of the main groove is greater than 0.50 and less than 1.00.

[0029] In addition, the present invention (8) provides a method for manufacturing a hard-soldering body of (6) or (7), characterized in that the aforementioned aluminum component to be hard-soldered is formed by an aluminum alloy containing any one or more of 1.50 mass % Si, 1.00 mass % or less Fe, 1.20 mass % or less Cu, 2.00 mass % or less Mn, 3.00 mass % or less Mg, 8.00 mass % or less Zn, 0.30 mass % or less Cr, 0.30 mass % or less Ti, 0.30 mass % or less Zr, 0.10 mass % or less In, 0.10 mass % or less Sn, 1.00 mass % or less Bi, 0.05 mass % or less Na, 0.05 mass % or less Sr and 0.05 mass % or less Sb, with the balance consisting of aluminum and unavoidable impurities.

[0030] In addition, the present invention (9) provides a method for manufacturing a hard solder body according to any one of (6) to (8), characterized in that the hard solder material of the aforementioned aluminum alloy hard solder plate also contains any one or more of 1.00 mass% Bi, 1.00 mass% Fe, 1.20 mass% Cu, 2.00 mass% Mn, 8.00 mass% Zn, 0.30 mass% Cr, 0.30 mass% Ti, 0.30 mass% Zr, 0.10 mass% In, 0.10 mass% Sn, 0.05 mass% Na, 0.05 mass% Sr and 0.05 mass% Sb.

[0031] In addition, the present invention (10) provides a method for manufacturing a hard solder body according to any one of (6) to (9), characterized in that the core material of the aforementioned aluminum alloy hard solder plate is formed by an aluminum alloy containing any one or more of 1.50 mass% Si, 1.00 mass% Fe, 1.20 mass% Cu, 2.00 mass% Mn, 3.00 mass% Mg, 8.00 mass% Zn, 0.30 mass% Cr, 0.30 mass% Ti, 0.30 mass% Zr, 0.10 mass% In, 0.10 mass% Sn, 1.00 mass% Bi, 0.05 mass% Na, 0.05 mass% Sr and 0.05 mass% Sb, and the balance is composed of aluminum and unavoidable impurities.

[0032] Effects of the Invention

[0033] According to the present invention, there are provided an aluminum material and a method for producing a brazed body, which can ensure good brazing properties even when a gap between members to be joined is large when brazing an aluminum material without using flux. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic cross-sectional view showing an example of the form of a groove formed in a member to be brazed.

[0035] Figure 2 It is a schematic cross-sectional view showing an example of the form of a groove formed in a member to be brazed.

[0036] Figure 3 It is a schematic cross-sectional view showing an example of the form of a groove formed in a member to be brazed.

[0037] Figure 4 It is a schematic cross-sectional view showing an example of the form of a groove formed in a member to be brazed.

[0038] Figure 5 It is a schematic cross-sectional view showing an example of the form of a groove formed in a member to be brazed.

[0039] Figure 6 It is a schematic cross-sectional view showing an example of the form of a groove formed in a member to be brazed.

[0040] Figure 7 It is a schematic cross-sectional view showing an example of the form of a groove formed in a member to be brazed.

[0041] Figure 8 This is a schematic perspective view showing an example of the shape of a pipe.

[0042] Fig. 9 This is a schematic perspective view showing an example of the shape of a plate material.

[0043] Fig.10 To show Figure 8 The pipe shown is Fig. 9 A perspective view of the assembly of panels shown.

[0044] Fig.11 A diagram for explaining the direction in which the grooves in the plate extend.

[0045] Fig.12 A diagram for explaining the direction in which grooves in a pipe extend.

[0046] Fig.13 It is a schematic diagram showing an example of the groove shape.

[0047] Fig.14 It is a diagram showing the formation range of the groove in the embodiment.

[0048] Fig.15 This is a diagram showing a test body used in a gap filling test in Examples. DETAILED DESCRIPTION

[0049] The first embodiment of the present invention is an aluminum component to be brazed, characterized in that it is brazed with a component formed of a brazing plate, the brazing plate having at least: a core material formed of an aluminum alloy; and a brazing material formed of an aluminum alloy containing 3.00 to 13.00 mass % of Si and 2.00 mass % or less of Mg (excluding zero), with the balance being aluminum and unavoidable impurities.

[0050] On the surface of the aluminum component to be brazed, there are two or more grooves in the area where the weld fillet is formed, the groove depth (D1) of the groove is 0.005 to 0.50 mm, the groove width (W1) of the groove is 0.005 to 0.50 mm, the ratio (W1 / D1) of the groove width (W1) to the groove depth (D1) is less than 10.00, and the interval (P1) between adjacent grooves is 0.00 to 0.30 mm.

[0051] The aluminum component to be brazed of the second embodiment of the present invention is an aluminum component to be brazed, characterized in that it is to be brazed with a component formed of a brazing plate, the brazing plate having at least: a core material formed of an aluminum alloy; and a brazing material formed of an aluminum alloy containing 3.00 to 13.00 mass % of Si and 2.00 mass % or less of Mg (excluding zero), with the balance being aluminum and unavoidable impurities,

[0052] A main groove and two or more sub-grooves arranged at the groove bottom of the main groove are provided on the surface of the weld fillet forming area of ​​the aluminum component to be hard-brazed, the groove depth (D2) of the sub-groove is 0.005 to 0.50 mm, the groove width (W2) of the sub-groove is 0.005 to 0.40 mm, the ratio (W2 / D2) of the groove width (W2) of the sub-groove to the groove depth (D2) of the sub-groove is less than 10.00, and the ratio (D2 / D3) of the groove depth (D2) of the sub-groove to the groove depth (D3) of the main groove is greater than 0.50 and less than 1.00.

[0053] In the first embodiment of the aluminum component to be brazed (hereinafter also referred to as the aluminum component to be brazed (1)) of the present invention and the second embodiment of the aluminum component to be brazed (hereinafter also referred to as the aluminum component to be brazed (2)), the shapes of the grooves on the surface of the aluminum component to be brazed within the range of forming the weld angle are different, but the composition and the shape of the components are the same. Therefore, regarding the same aspect, they are described as the aluminum component to be brazed (1 or 2).

[0054] The aluminum component (1 or 2) to be brazed is a molded body of pure aluminum or an aluminum alloy, and is an aluminum component to be brazed with a component formed of an aluminum alloy brazing plate in brazing without using flux, and does not have a brazing material. Hereinafter, the aluminum material (pure aluminum material or aluminum alloy material) formed into the aluminum component (1 or 2) to be brazed is referred to as pure aluminum for the component (1 or 2) to be brazed or an aluminum alloy for the component (1 or 2) to be brazed, and they are collectively referred to as aluminum materials for the component (1 or 2) to be brazed.

[0055] There are no particular restrictions on the aluminum component (1 or 2) to be brazed as long as it is used as a matching material for brazing with a component formed by a brazing plate by heating through brazing. For example, the following can be cited: a molded body in which the plate-like component (1 or 2) to be brazed is formed into a tube, fin, header, tank, cover, etc. using aluminum material; an extruded piping, an extruded porous tube, and a drawn material made by extruding the component (1 or 2) to be brazed using aluminum material; an electric welded pipe in which a strip-shaped plate material is bent in a manner in which the side end faces are opposed to each other, and the side end faces are high-frequency welded and deformed into a flat shape; etc.

[0056] The composition of the aluminum alloy for the member to be brazed (1 or 2) is not particularly limited as long as it is a composition used in a counterpart material brazed with a member formed of a brazing sheet by brazing heating.

[0057] As the aluminum alloy for the brazed component (1 or 2), there can be mentioned: an aluminum alloy containing any one or more of 1.50 mass % Si, 1.00 mass % or less Fe, 1.20 mass % or less Cu, 2.00 mass % or less Mn, 3.00 mass % or less Mg, 8.00 mass % or less Zn, 0.30 mass % or less Cr, 0.30 mass % or less Ti, 0.30 mass % or less Zr, 0.10 mass % or less In, 0.10 mass % or less Sn, 1.00 mass % or less Bi, 0.05 mass % or less Na, 0.05 mass % or less Sr and 0.05 mass % or less Sb, with the balance consisting of aluminum and unavoidable impurities.

[0058] The aluminum alloy for the brazed component (1 or 2) may contain Si. Si forms intermetallic compounds of the Al-Mn-Si system, Al-Fe-Si system, and Al-Fe-Mn-Si system together with Fe and Mn, and acts as a dispersion reinforcement, or is dissolved in the matrix to improve the material strength by solid solution strengthening. In addition, Si reacts with Mg and exerts an effect on the strength improvement caused by the aging precipitation of Mg2Si compounds. When the aluminum alloy for the brazed component (1 or 2) contains Si, the Si content in the aluminum alloy for the brazed component (1 or 2) is 1.50 mass% or less, preferably 0.05 to 1.50 mass%, and particularly preferably 0.20 to 1.00 mass%. If the Si content exceeds the above range, the solidus temperature (melting point) of the brazed component becomes lower, and the concern that the brazed component melts during brazing becomes higher.

[0059] The aluminum alloy for the brazed component (1 or 2) may contain Fe. Fe forms intermetallic compounds of Al-Fe-Mn system, Al-Fe-Si system, and Al-Fe-Mn-Si system together with Mn and Si, and acts as a dispersion reinforcement to improve the material strength. When the aluminum alloy for the brazed component (1 or 2) contains Fe, the Fe content in the aluminum alloy for the brazed component (1 or 2) is 1.00 mass% or less, preferably 0.05 to 1.00 mass%, and particularly preferably 0.05 to 0.70 mass%. If the Fe content exceeds the above range, a giant intermetallic compound is easily formed during casting, and the plastic workability becomes low.

[0060] The aluminum alloy for the brazed component (1 or 2) may contain Cu. Cu improves material strength by solid solution strengthening. When the aluminum alloy for the brazed component (1 or 2) contains Cu, the Cu content in the aluminum alloy for the brazed component (1 or 2) is 1.20 mass % or less, preferably 0.05 to 0.80 mass %. If the Cu content exceeds the above range, the solidus temperature (melting point) of the brazed component becomes lower, and the concern that the brazed component melts during brazing becomes higher.

[0061] The aluminum alloy for the brazed component (1 or 2) may contain Mn. Mn forms intermetallic compounds of the Al-Fe-Mn system, Al-Mn-Si system, and Al-Fe-Mn-Si system together with Fe and Si, and acts as a dispersion reinforcement, or is dissolved in the matrix to improve the material strength by solid solution strengthening. When the aluminum alloy for the brazed component (1 or 2) contains Mn, the Mn content in the aluminum alloy for the brazed component (1 or 2) is 2.00 mass% or less, preferably 0.60 to 1.50 mass%. If the Mn content exceeds the above range, giant intermetallic compounds are easily generated during casting, and plastic workability becomes low.

[0062] The aluminum alloy for the brazed member (1 or 2) may contain Mg. Mg destroys the aluminum oxide film covering the surface of the brazed member during brazing heating, and improves the wettability between the brazing material supplied from the brazing plate and the surface of the brazed member. When the aluminum alloy for the brazed member (1 or 2) contains Mg, the Mg content in the aluminum alloy for the brazed member (1 or 2) is 3.00 mass% or less, preferably 0.02 to 1.50 mass%, and particularly preferably 0.50 to 1.20 mass%. On the other hand, if the Mg content is lower than the above range, the effect of destroying the oxide film of the brazed member becomes insufficient. In addition, if it exceeds the above range, MgO is formed on the surface of the brazed member, so the brazing property is reduced.

[0063] The aluminum alloy for the brazed member (1 or 2) may contain Zn. Zn weakens the aluminum oxide film covering the surface of the brazed member, and through the synergistic effect of Bi and Mg contained at the same time, the oxide film of the brazed member is destroyed, and the wettability of the brazing material supplied from the brazing plate and the surface of the brazed member is improved. In addition, Zn makes the natural potential low and exerts a sacrificial anti-corrosion effect. When the aluminum alloy for the brazed member (1 or 2) contains Zn, the Zn content in the aluminum alloy for the brazed member (1 or 2) is 8.00 mass% or less, preferably 0.50 to 5.00 mass%, and particularly preferably 1.50 to 3.50 mass%. On the other hand, if the Zn content is lower than the above range, the effect of weakening the oxide film on the surface of the brazed member becomes insufficient. In addition, if it exceeds the above range, the solidus temperature (melting point) of the brazed member becomes low, and the concern of melting of the brazed member during brazing becomes high.

[0064] The aluminum alloy for the brazed member (1 or 2) may contain any one or more of Cr, Ti and Zr. Cr, Ti and Zr improve strength by solid solution strengthening. When the aluminum alloy for the brazed member (1 or 2) contains Cr, the Cr content in the aluminum alloy for the brazed member (1 or 2) is 0.30 mass % or less, preferably 0.10 to 0.20 mass %. When the aluminum alloy for the brazed member (1 or 2) contains Ti, the Ti content in the aluminum alloy for the brazed member (1 or 2) is 0.30 mass % or less, preferably 0.10 to 0.20 mass %. When the aluminum alloy for the brazed member (1 or 2) contains Zr, the Zr content in the aluminum alloy for the brazed member (1 or 2) is 0.30 mass % or less, preferably 0.10 to 0.20 mass %. If the content of Cr, Ti or Zr exceeds the above range, giant intermetallic compounds are easily formed during casting, and plastic workability decreases.

[0065] The aluminum alloy for the brazed component (1 or 2) may contain any one or two of In and Sn. In and Sn make the natural potential low and exert a sacrificial anti-corrosion effect. When the aluminum alloy for the brazed component (1 or 2) contains In, the In content in the aluminum alloy for the brazed component (1 or 2) is less than 0.10 mass%, preferably 0.005 to 0.10 mass%, and particularly preferably 0.01 to 0.05 mass%. When the aluminum alloy for the brazed component (1 or 2) contains Sn, the Sn content in the aluminum alloy for the brazed component (1 or 2) is less than 0.10 mass%, preferably 0.005 to 0.10 mass%, and particularly preferably 0.01 to 0.05 mass%. If the content of In or Sn exceeds the above range, local melting occurs during hot rolling, making manufacturing difficult.

[0066] The aluminum alloy for the brazed member (1 or 2) may contain Bi. Bi melts the surface layer of the brazed member by the brazing material supplied from the brazing plate during brazing heating, thereby reducing the surface tension of the brazed member and improving the wettability of the brazing material supplied from the brazing plate and the surface of the brazed member. When the aluminum alloy for the brazed member (1 or 2) contains Bi, the Bi content in the aluminum alloy for the brazed member (1 or 2) is 1.00 mass% or less, preferably 0.05 to 0.30 mass%. On the other hand, if the Bi content is lower than the above range, the effect of reducing the surface tension of the brazed member becomes insufficient. In addition, if it exceeds the above range, cracks will occur during hot rolling, making manufacturing difficult.

[0067] The aluminum alloy for the brazed component (1 or 2) may contain any one or more of Na, Sr and Sb. Na, Sr and Sb are dissolved into the fillet formed during brazing, so that the Si particles of the fillet are refined. When the aluminum alloy for the brazed component (1 or 2) contains Na, the Na content in the aluminum alloy for the brazed component (1 or 2) is 0.05 mass% or less, preferably 0.003 to 0.05 mass%, and particularly preferably 0.005 to 0.03 mass%. When the aluminum alloy for the brazed component (1 or 2) contains Sr, the Sr content in the aluminum alloy for the brazed component (1 or 2) is 0.05 mass% or less, preferably 0.003 to 0.05 mass%, and particularly preferably 0.005 to 0.03 mass%. When the aluminum alloy for the brazed member (1 or 2) contains Sb, the Sb content in the aluminum alloy for the brazed member (1 or 2) is 0.05 mass% or less, preferably 0.003 to 0.05 mass%, particularly preferably 0.005 to 0.03 mass%.

[0068] The aluminum component (1 or 2) to be brazed can be formed of a single aluminum alloy for the component (1 or 2) to be brazed, or can be formed of an aluminum alloy for the component (1 or 2) to be brazed having one or more aluminum alloy layers on the surface. As the aluminum alloy layer, a sacrificial anode material layer, a skin material layer, an intermediate material layer, a brazing sacrificial material layer, etc. can be cited. The sacrificial anode material layer can be a skin material layer, an intermediate material layer, a brazing sacrificial material layer, etc. The sacrificial anode material layer mainly contains Zn, etc., and is an aluminum alloy layer having the function of anti-corrosion through the sacrificial anode effect. As the skin material layer, an aluminum alloy layer mainly contains Si, melts when brazing is heated, and has the function of serving as a brazing material can be cited. As the intermediate layer, a coating layer having the function of a sacrificial anode material with Zn added, a function of improving strength by adding Mn, a function of adding Mg to diffuse Mg to the surface when brazing is heated, and a function of promoting the destruction of the oxide film can be cited. The composition of the aluminum alloy layer can be appropriately selected according to the function. As an aluminum member (1 or 2) to be brazed formed of a single aluminum alloy for a member (1 or 2) to be brazed, for example, there can be mentioned: an extruded processing material such as an extruded pipe or an extruded porous pipe manufactured by extruding one aluminum alloy; a plate-shaped bare material manufactured by rolling one aluminum alloy into a plate shape. As an aluminum member (1 or 2) to be brazed formed of an aluminum alloy for a member (1 or 2) to be brazed having one or more aluminum alloy layers on the surface, for example, there can be mentioned: a member to be brazed formed of a coating material with one or more aluminum alloy layers coated on one or both sides of a core material formed of a plate-shaped aluminum alloy for a member (1 or 2) to be brazed; a member to be brazed in which one or more aluminum alloy layers are thermally sprayed onto the surface of an extruded pipe or an extruded porous pipe of an aluminum alloy for a member (1 or 2) to be brazed, etc.

[0069] The component formed by the brazing plate of the aluminum component to be brazed (1) is the same as the component formed by the brazing plate of the aluminum component to be brazed (2). Hereinafter, the component formed by the brazing plate of the aluminum component to be brazed (1) and the component formed by the brazing plate of the aluminum component to be brazed (2) are collectively referred to as the component formed by the brazing plate of the present invention for explanation. In addition, the brazing plate forming the component formed by the brazing plate of the present invention is referred to as the brazing plate of the present invention.

[0070] The component formed of the brazing sheet of the present invention is a molded body of the brazing sheet of the present invention, and is a component formed of an aluminum alloy brazing sheet brazed with an aluminum component to be brazed (1 or 2) in brazing without using flux.

[0071] As components formed by the brazing sheet of the present invention, there can be cited: a molded body formed by molding the brazing sheet of the present invention into a tube, a fin, a header, a tank material, etc.; an extruded piping, an extruded porous tube, and a drawn material produced by extruding the brazed component using aluminum material; and an electric welded pipe in which a strip-shaped plate material is bent in a manner such that the side end faces are opposed to each other, the side end faces are high-frequency welded, and deformed into a flat shape.

[0072] The brazing sheet of the present invention has at least a core material and a brazing material. Examples of the brazing sheet of the present invention include: a two-layer cladding material having a brazing material disposed on one surface of a core material, a three-layer cladding material having a brazing material disposed on both surfaces of a core material, a multi-layer cladding material having one or more aluminum alloy layers and a brazing material disposed on one surface of a core material, and a multi-layer cladding material having one or more aluminum alloy layers or a brazing material disposed on both surfaces of a core material.

[0073] The aluminum alloy constituting the core material of the brazing plate of the present invention is an existing alloy having a solidus temperature of 600°C or above, and can be 1000 series, 2000 series, 3000 series, 4000 series, 5000 series, 6000 series, 7000 series, or 8000 series, preferably 1000 series, 3000 series, 5000 series, 6000 series, or 7000 series.

[0074] Examples of the core material of the brazing sheet of the present invention include an aluminum alloy containing any one or more of 1.50 mass % Si, 1.00 mass % Fe, 1.20 mass % Cu, 2.00 mass % Mn, 3.00 mass % Mg, 8.00 mass % Zn, 0.30 mass % Cr, 0.30 mass % Ti, 0.30 mass % Zr, 0.10 mass % In, 0.10 mass % Sn, 1.00 mass % Bi, 0.05 mass % Na, 0.05 mass % Sr and 0.05 mass % Sb, with the balance being aluminum and unavoidable impurities.

[0075] The core material of the brazing sheet of the present invention may contain Si. Si forms intermetallic compounds of the Al-Mn-Si system, Al-Fe-Si system, and Al-Fe-Mn-Si system together with Fe and Mn, and acts as a dispersion reinforcement, or is dissolved in the matrix to improve the material strength through solid solution strengthening. In addition, Si reacts with Mg to exert an effect on the strength improvement caused by the aging precipitation of Mg2Si compounds. In the case where the core material of the brazing sheet of the present invention contains Si, the Si content in the core material is 1.50 mass% or less, preferably 0.05 to 1.50 mass%, and particularly preferably 0.20 to 1.00 mass%. If the Si content exceeds the above range, the solidus temperature (melting point) of the brazed component becomes lower, and the concern that the brazed component melts during brazing becomes higher.

[0076] The core material of the brazing sheet of the present invention may contain Fe. Fe, together with Mn and Si, forms intermetallic compounds of the Al-Fe-Mn system, Al-Fe-Si system, and Al-Fe-Mn-Si system, and acts as a dispersion reinforcement to improve material strength. When the core material of the brazing sheet of the present invention contains Fe, the Fe content in the core material is 1.00 mass% or less, preferably 0.05 to 1.00 mass%, and particularly preferably 0.05 to 0.70 mass%. If the Fe content exceeds the above range, giant intermetallic compounds are easily formed during casting, and plastic workability becomes low.

[0077] The core material of the brazing sheet of the present invention may contain Cu. Cu improves material strength by solid solution strengthening. When the core material of the brazing sheet of the present invention contains Cu, the Cu content in the core material is 1.20 mass % or less, preferably 0.05 to 0.80 mass %. If the Cu content exceeds the above range, the solidus temperature (melting point) of the brazed member becomes lower, and the concern that the brazed member melts during brazing becomes higher.

[0078] The core material of the brazing sheet of the present invention may contain Mn. Mn forms intermetallic compounds of the Al-Fe-Mn system, Al-Mn-Si system, and Al-Fe-Mn-Si system together with Fe and Si, and acts as a dispersion reinforcement, or is dissolved in the matrix to improve the material strength through solid solution strengthening. When the core material of the brazing sheet of the present invention contains Mn, the Mn content in the core material is 2.00 mass% or less, preferably 0.60 to 1.50 mass%. If the Mn content exceeds the above range, giant intermetallic compounds are easily generated during casting, and plastic workability becomes low.

[0079] The core material of the brazing plate of the present invention may contain Mg. The Mg contained in the core material is dissolved in the matrix to improve the material strength through solid solution strengthening. In addition, the Mg contained in the core material reacts with Si, exerts an effect on the strength improvement caused by the aging precipitation of the Mg2Si compound, and the oxide formation free energy is lower than that of aluminum. Therefore, when the brazing is heated, it diffuses into the brazing material and destroys the aluminum oxide film covering the surface of the brazing material. The Mg content in the core material is 3.00% by mass or less, preferably 0.02 to 1.50% by mass, and particularly preferably 0.50 to 1.20% by mass. If the Mg content in the core material exceeds the above range, the solidus temperature (melting point) of the core material becomes lower, and the concern of causing the core material to melt during brazing becomes higher.

[0080] The core material of the brazing sheet of the present invention may contain Zn. When the core material is not covered by the brazing material or the alloy layer, Zn weakens the aluminum oxide film covering the surface of the core material, and through the synergistic effect of Bi and Mg contained at the same time, the destruction of the oxide film of the core material is ensured, and the wettability of the brazing material supplied from the brazing sheet and the core material surface is improved. In addition, the natural potential is low, and a sacrificial anti-corrosion effect is exerted. When the core material of the brazing sheet of the present invention contains Zn, the Zn content in the core material is 8.00 mass% or less, preferably 0.50 to 5.00 mass%, and particularly preferably 1.50 to 3.50 mass%. If the Zn content exceeds the above range, the solidus temperature (melting point) of the core material becomes low, and the concern of melting of the core material during brazing becomes high.

[0081] The core material of the brazing sheet of the present invention may contain any one or more of Cr, Ti and Zr. Cr, Ti and Zr improve strength by solid solution strengthening. When the core material of the brazing sheet of the present invention contains Cr, the content of Cr in the core material is 0.30% by mass or less, preferably 0.10 to 0.20% by mass. When the core material of the brazing sheet of the present invention contains Ti, the content of Ti in the core material is 0.30% by mass or less, preferably 0.10 to 0.20% by mass. When the core material of the brazing sheet of the present invention contains Zr, the content of Zr in the core material is 0.30% by mass or less, preferably 0.10 to 0.20% by mass. If the content of Cr, Ti and Zr exceeds the above range, giant intermetallic compounds become easy to form during casting, and plastic workability becomes low.

[0082] The core material of the brazing sheet of the present invention may contain any one or two of In and Sn. In and Sn make the natural potential low and exert a sacrificial anti-corrosion effect. When the core material of the brazing sheet of the present invention contains In, the content of In in the core material is 0.10% by mass or less, preferably 0.005 to 0.10% by mass, and particularly preferably 0.01 to 0.05% by mass. When the core material of the brazing sheet of the present invention contains Sn, the content of Sn in the core material is 0.10% by mass or less, preferably 0.005 to 0.10% by mass, and particularly preferably 0.01 to 0.05% by mass. If the content of In and Sn exceeds the above range, local melting occurs during hot rolling, making manufacturing difficult.

[0083] The core material of the brazing sheet of the present invention may contain Bi. Bi melts the core material during brazing heating, thereby supplying Bi to the brazing material, reducing the surface tension of the molten brazing material, and improving brazing properties. When the core material of the brazing sheet of the present invention contains Bi, the Bi content in the core material is 1.00 mass% or less, preferably 0.05 to 0.30 mass%. If the Bi content exceeds the above range, cracks will occur during hot rolling, making manufacturing difficult.

[0084] The core material of the brazing sheet of the present invention may contain any one or more of Na, Sr and Sb. Na, Sr and Sb melt the core material during brazing heating, thereby supplying Na, Sr and Sb to the brazing material, thereby refining Si particles when the brazing material solidifies. When the core material of the brazing sheet of the present invention contains Na, the Na content in the core material is 0.05% by mass or less, preferably 0.003 to 0.05% by mass, and particularly preferably 0.005 to 0.03% by mass. When the core material of the brazing sheet of the present invention contains Sr, the Sr content in the core material is 0.05% by mass or less, preferably 0.003 to 0.05% by mass, and particularly preferably 0.005 to 0.03% by mass. When the core material of the brazing sheet of the present invention contains Sb, the Sb content in the core material is 0.05% by mass or less, preferably 0.003 to 0.05% by mass, and particularly preferably 0.005 to 0.03% by mass.

[0085] The brazing material of the brazing sheet of the present invention is formed of an aluminum alloy containing 3.00 to 13.00 mass % of Si and 2.00 mass % or less of Mg (excluding zero), with the balance being aluminum and inevitable impurities.

[0086] The Si content in the brazing material of the brazing sheet of the present invention is 3.00 to 13.00 mass %. If the Si content in the brazing material is below the above range, the brazing property is insufficient, and if it exceeds the above range, coarse primary Si is easily formed during casting, cracks are easily generated during material production, and plastic workability is reduced.

[0087] The Mg content in the brazing material of the brazing sheet of the present invention is 2.00 mass% or less (excluding zero), preferably 1.00 mass% or less (excluding zero). If the Mg content in the brazing material exceeds the above range, MgO is formed on the surface of the brazing material before the brazing material melts during brazing heating, so the brazing property becomes low. In addition, the Mg content in the brazing material of the brazing sheet of the present invention is preferably 0.01 mass% or more.

[0088] The brazing material of the brazing plate of the present invention may further contain any one or two or more of 1.00 mass % or less of Bi, 1.00 mass % or less of Fe, 1.20 mass % or less of Cu, 2.00 mass % or less of Mn, 8.00 mass % or less of Zn, 0.30 mass % or less of Cr, 0.30 mass % or less of Ti, 0.30 mass % or less of Zr, 0.10 mass % or less of In, 0.10 mass % or less of Sn, 0.05 mass % or less of Na, 0.05 mass % or less of Sr and 0.05 mass % or less of Sb.

[0089] The brazing material of the brazing sheet of the present invention may further contain Bi. The Bi contained in the brazing material promotes the destruction of the oxide film caused by Mg supplied from the core material to the brazing material during brazing heating, thereby improving the brazing properties. When the brazing material of the brazing sheet of the present invention contains Bi, the Bi content in the brazing material is 1.00 mass % or less, preferably 0.004 to 0.50 mass %. If the Bi content in the brazing material exceeds the above range, cracks will occur during hot rolling, making manufacturing difficult.

[0090] The brazing material of the brazing sheet of the present invention may further contain 1.00 mass % or less, preferably 0.05 to 0.50 mass % of Fe.

[0091] The brazing material of the brazing sheet of the present invention may further contain any one or two of Zn and Cu. Zn and Cu in the brazing material lower the melting point of the brazing material, making brazing possible at a temperature lower than 600°C, which is a general brazing temperature. When the brazing material of the brazing sheet of the present invention contains Zn, the Zn content in the brazing material is 8.00% by mass or less, preferably 0.50 to 8.00% by mass, and particularly preferably 2.00 to 4.00% by mass. When the brazing material of the brazing sheet of the present invention contains Cu, the Cu content in the brazing material is 4.00% by mass or less, preferably 1.00 to 3.00% by mass.

[0092] The brazing material of the brazing sheet of the present invention may further contain any one or more of Mn, Cr, Ti and Zr. Mn, Cr, Ti and Zr in the brazing material coarsen the crystal grain size of the brazing material after brazing, inhibit the degranulation of the brazing material in a corrosive environment, and thus improve the corrosion resistance. When the brazing material of the brazing sheet of the present invention contains Mn, the Mn content in the brazing material is 2.00 mass% or less, preferably 0.10 to 0.60 mass%. When the brazing material of the brazing sheet of the present invention contains Cr, the Cr content in the brazing material is 0.30 mass% or less, preferably 0.05 to 0.10 mass%. When the brazing material of the brazing sheet of the present invention contains Ti, the Ti content in the brazing material is 0.30 mass% or less, preferably 0.05 to 0.10 mass%. When the brazing material of the brazing sheet of the present invention contains Zr, the Zr content in the brazing material is 0.30 mass % or less, preferably 0.05 to 0.10 mass %. If the content of Mn, Cr, Ti or Zr in the brazing material exceeds the above range, giant intermetallic compounds are easily formed during casting, and plastic workability decreases.

[0093] The brazing material of the brazing sheet of the present invention may further contain any one or two of In and Sn. In and Sn in the brazing material lower the natural potential of the material and exert a sacrificial anti-corrosion effect. When the brazing material of the brazing sheet of the present invention contains In, the In content in the brazing material is 0.10 mass% or less, preferably 0.005 to 0.10 mass%, and particularly preferably 0.01 to 0.05 mass%. When the brazing material of the brazing sheet of the present invention contains Sn, the Sn content in the brazing material is 0.10 mass% or less, preferably 0.005 to 0.10 mass%, and particularly preferably 0.01 to 0.05 mass%.

[0094] The brazing material of the brazing sheet of the present invention may further contain any one or more of Na, Sr and Sb. Na, Sr or Sb is added to the brazing material to refine Si particles. When the brazing material of the brazing sheet of the present invention contains Na, the Na content in the brazing material is 0.05% by mass or less, preferably 0.003 to 0.05% by mass, and particularly preferably 0.005 to 0.03% by mass. When the brazing material of the brazing sheet of the present invention contains Sr, the Sr content in the brazing material is 0.05% by mass or less, preferably 0.003 to 0.05% by mass, and particularly preferably 0.005 to 0.03% by mass. When the brazing material of the brazing sheet of the present invention contains Sb, the Sb content in the brazing material is 0.05% by mass or less, preferably 0.003 to 0.05% by mass, and particularly preferably 0.005 to 0.03% by mass.

[0095] The grooves (two or more grooves) formed on the surface of an aluminum component (1) to be brazed are different from the grooves (a main groove having two or more sub-grooves at the bottom of the groove) formed on the surface of an aluminum component (2) to be brazed, and therefore are described separately.

[0096] In an aluminum member (1) to be brazed, two or more grooves are provided on the surface of the aluminum member (1) to be brazed in a fillet forming region, the groove depth (D1) of the grooves is 0.005 to 0.50 mm, the groove width (W1) of the grooves is 0.005 to 0.50 mm, the ratio (W1 / D1) of the groove width (W1) to the groove depth (D1) is 10.00 or less, and the interval (P1) between adjacent grooves is 0.00 to 0.30 mm. By providing such grooves in the fillet forming region of the joint, after brazing material flows into the grooves, the brazing material flows along the grooves by a capillary phenomenon, and the fillet is continuously formed without interruption in the middle, thereby forming a sound brazing joint without fillet interruption.

[0097] Two or more grooves are provided on the surface of the aluminum member (1) to be brazed. The number of grooves provided on the surface of the aluminum member (1) to be brazed in the area where the fillet is formed is 2 or more, preferably 4 or more, and particularly preferably 8 or more. If the number of grooves provided on the surface of the aluminum member (1) to be brazed in the area where the fillet is formed is less than the above range, the amount of brazing material flowing along the grooves is insufficient, and a sound brazed joint cannot be formed.

[0098] The groove depth (D1) of the groove provided on the surface of the aluminum member (1) to be brazed is 0.005 to 0.50 mm, preferably 0.005 to 0.30 mm, and particularly preferably 0.005 to 0.10 mm in any groove. By making the groove depth (D1) within the above range, the wettability and diffusibility of the brazing material to the member to be brazed during brazing heating becomes higher, so that good brazing properties can be ensured. On the other hand, if the groove depth (D1) is lower than the above range, the capillary phenomenon does not work sufficiently and a sound brazing joint cannot be formed. In addition, if it exceeds the above range, the molten brazing material fills the groove and is consumed, and the amount of brazing material becomes insufficient, and good brazing properties cannot be ensured.

[0099] The groove width (W1) of the groove provided on the surface of the aluminum component (1) to be brazed is 0.005 to 0.50 mm, preferably 0.005 to 0.40 mm, and particularly preferably 0.005 to 0.30 mm in any groove. By making the groove width (W1) within the above range, the wettability and diffusibility of the brazing material to the component to be brazed during brazing heating becomes higher, so that good brazing properties can be ensured. On the other hand, if the groove width (W1) is less than the above range, the flow path of the molten brazing material is narrow, so that a sound brazing joint cannot be formed and good brazing properties cannot be ensured. In addition, if it exceeds the above range, the molten brazing material fills the groove and is consumed, and the amount of brazing material becomes insufficient, so that good brazing properties cannot be ensured.

[0100] In the aluminum member (1) to be brazed, the ratio (W1 / D1) of the groove width (W) to the groove depth (D1) is 10.00 or less, preferably 0.20 to 5.00, and particularly preferably 0.50 to 5.00 in any groove. By making W1 / D1 within the above range, the wettability and diffusibility of the brazing material to the member to be brazed during brazing heating becomes high, thereby ensuring good brazing properties. On the other hand, if W1 / D1 exceeds the above range, the capillary phenomenon does not work sufficiently, and a sound brazing joint cannot be formed.

[0101] In the aluminum member (1) to be brazed, the interval (P1) between adjacent grooves is 0.00 to 0.30 mm, preferably 0.00 to 0.20 mm, and particularly preferably 0.00 to 0.10 mm. By making the interval (P1) between adjacent grooves within the above range, the wettability and diffusibility of the brazing material to the member to be brazed during brazing heating are improved, and good brazing properties can be ensured. On the other hand, if the interval (P1) between adjacent grooves exceeds the above range, the brazing materials between the grooves cannot contact each other, the weld fillet is broken, and a sound brazing joint cannot be formed.

[0102] In an aluminum component (1) to be brazed, the groove depth (D1) of a groove refers to: the distance between the deepest part of the groove and the extension line of the non-formed part of the groove in a cross section cut along a direction perpendicular to the extension direction of the groove (width direction). In addition, the groove width (W1) of the groove refers to: the distance between the highest parts of the groove surface on both sides of the width direction of the groove in a cross section cut along a direction perpendicular to the extension direction of the groove (width direction). The interval (P1) between adjacent grooves refers to: the distance between the highest part of the groove surface of one groove and the highest part of the groove surface of an adjacent groove in a cross section cut along a direction perpendicular to the extension direction of the groove (width direction).

[0103] In the aluminum component (1) to be brazed, as the cross-sectional shape when the groove is cut in the width direction, a substantially triangular shape or a substantially quadrilateral shape can be mentioned, and as the shape of the groove surface, a substantially V-shape can be mentioned. In addition, in the aluminum component (1) to be brazed, the non-formed portion of the groove may exist between adjacent grooves, or the non-formed portion of the groove may not exist between adjacent grooves. In addition, in the aluminum component (1) to be brazed, the position of the highest part of the groove surface of the groove may be the same height as the position of the extension line of the non-formed portion of the groove, or the position of the highest part of the groove surface of the groove may be higher than the position of the extension line of the non-formed portion of the groove. In addition, in the aluminum component (1) to be brazed, the highest part of the groove surface of one groove and the highest part of the groove surface of the adjacent groove may overlap at the position of the extension line of the non-formed portion of the groove. In addition, in the aluminum component (1) to be brazed, a raised portion in which the position of the highest part becomes higher than the position of the extension line of the non-formed portion of the groove can be formed on the upper part of the groove surface of the groove.

[0104] Reference Figure 1 to Figure 5 , a groove formed in an aluminum member (1) to be brazed is described in detail. Figure 1 to Figure 5 A schematic cross-sectional view showing an example of the shape of a groove formed in an aluminum member (1) to be brazed. Figure 1In the figure, the groove depth (D1) of the groove 2 refers to the distance between the deepest part 7 of the groove 2 and the extension line 8 of the non-formed part 3 of the groove. The groove width (W1) of the groove 2 refers to the distance between the highest parts 6 of the groove surface 5 on both sides of the width direction of the groove 2. The interval (P1) between adjacent grooves refers to the distance between the highest part 6 of the groove surface 5 of one groove 2 and the highest part 6 of the groove surface 5 of the adjacent groove 2.

[0105] Figure 1 In the embodiment shown, the cross-sectional shape of the groove 2 when cut along the width direction is substantially triangular, and the groove surface 5 of the groove 2 is substantially V-shaped. Figure 1 In the embodiment shown, the non-grooved portion 3 exists between adjacent grooves. Figure 1 In the illustrated embodiment, the position of the highest portion 6 of the groove surface 5 of the groove 2 and the position of the extension line 8 of the groove non-formed portion 3 are at the same height. Figure 1 In the illustrated embodiment, the position of the highest portion 6 of the groove surface 5 of the groove 2 may be higher than the position of the extension line 8 of the groove non-formed portion 3 .

[0106] Figure 2 In the embodiment shown, the cross-sectional shape of the groove 2 when cut along the width direction is substantially triangular, and the groove surface 5 of the groove 2 is substantially V-shaped. Figure 2 In the embodiment shown, the highest portion 6 of the groove surface 5 of one groove 2 overlaps with the highest portion 6 of the groove surface 5 of the adjacent groove 2 at the position of the extension line 8 of the groove non-forming portion 3. Figure 2 In the embodiment shown, the non-grooved portion 3 does not exist between adjacent grooves, and the interval (P1) between adjacent grooves is 0.0 mm. Figure 2 In the illustrated embodiment, the position of the highest portion 6 of the groove surface 5 of the groove 2 and the position of the extension line 8 of the groove non-formed portion 3 are at the same height. Figure 2 In the embodiment shown, the position of the highest portion 6 of the groove surface 5 of the groove 2 may be higher than the position of the extension line 8 of the non-formed portion 3 of the groove. Figure 2 In the morphological example shown, the distance between the deepest point 7 of the groove 2 and the extension line 8 of the non-formed part 3 of the groove is the groove depth (D1) of the groove, and the distance between the highest parts 6 of the groove surface 5 on both sides of the width direction of the groove 2 is the groove width (W1) of the groove 2.

[0107] Figure 3 In the embodiment shown, the cross-sectional shape of the groove 2 when cut along the width direction is substantially triangular, and the groove surface 5 of the groove 2 is substantially V-shaped. Figure 3 In the embodiment shown, the highest portion 6 of the groove surface 5 of one groove 2 overlaps with the highest portion 6 of the groove surface 5 of the adjacent groove 2 at the position of the extension line 8 of the groove non-forming portion 3. Figure 3In the embodiment shown, the non-grooved portion 3 does not exist between adjacent grooves, and the interval (P1) between adjacent grooves is 0.0 mm. Figure 3 In the embodiment shown, a ridge 9 is formed at the upper part of the outer side of the groove in the width direction at both ends in the width direction, where the position of the highest part 6 becomes higher than the position of the extension line 8 of the non-groove forming part 3. Figure 3 In the embodiment shown, the position of the highest part 6 of the groove surface 5 of the groove 2 is at the same height as the position of the extension line 8 of the non-formed part 3 of the groove, except for the grooves at both ends in the width direction, and the position of the highest part 6 of the groove surface 5 on the outer side in the width direction of the grooves at both ends in the width direction is higher than the position of the extension line 8 of the non-formed part 3 of the groove. It should be noted that Figure 3 In the morphological example shown, the distance between the deepest point 7 of the groove 2 and the extension line 8 of the non-formed part 3 of the groove is the groove depth (D1) of the groove, and the distance between the highest parts 6 of the groove surface 5 on both sides of the width direction of the groove 2 is the groove width (W1) of the groove 2.

[0108] Figure 4 and Figure 5 In the embodiment shown, the cross-sectional shape of the groove 2 when cut along the width direction is substantially quadrilateral. Figure 4 and Figure 5 In the example shown, Figure 4 or Figure 5 Symbol D1 shown in FIG. 1 is the groove depth of the groove, symbol W1 is the groove width of the groove, and symbol P1 is the interval between adjacent grooves.

[0109] In the aluminum member (2) to be brazed, a main groove and two or more sub-grooves provided at the groove bottom of the main groove are provided on the surface of the aluminum member to be brazed in the fillet forming area, the groove depth (D2) of the sub-groove is 0.005 to 0.50 mm, the groove width (W2) of the sub-groove is 0.005 to 0.40 mm, the ratio (W2 / D2) of the groove width (W2) of the sub-groove to the groove depth (D2) of the sub-groove is 10.00 or less, and the ratio (D2 / D3) of the groove depth (D2) of the sub-groove to the groove depth (D3) of the main groove is 0.50 or more and less than 1.00. By providing such a groove in the fillet forming area of ​​the joint, after the brazing material flows into the groove, the brazing material flows along the groove by the capillary phenomenon, and the fillet is continuously formed without interruption in the middle, thereby forming a sound brazing joint without fillet interruption.

[0110] A main groove having two or more sub-grooves formed at the groove bottom is provided on the surface of an aluminum member (2) to be brazed. In the aluminum member (2) to be brazed, the number of sub-grooves provided at the groove bottom of the main groove is 2 or more, preferably 4 or more, and particularly preferably 8 or more. In the aluminum member (2) to be brazed, if the number of sub-grooves provided at the groove bottom of the main groove is less than the above range, the amount of brazing material flowing along the sub-grooves is insufficient, and a sound brazed joint cannot be formed.

[0111] In the aluminum member (2) to be brazed, the groove depth (D2) of the sub-groove formed at the groove bottom of the main groove is 0.005 to 0.50 mm, preferably 0.005 to 0.40 mm, and particularly preferably 0.005 to 0.20 mm in any of the sub-grooves. By making the groove depth (D2) of the sub-groove within the above range, the wettability and diffusibility of the brazing material to the member to be brazed during brazing heating becomes higher, so that good brazing properties can be ensured. On the other hand, if the groove depth (D2) of the sub-groove is less than the above range, the capillary phenomenon does not work sufficiently and a sound brazing joint cannot be formed. In addition, if it exceeds the above range, the groove is filled, so the molten brazing material is consumed, the brazing material becomes insufficient, and good brazing properties cannot be ensured.

[0112] In the aluminum component (2) to be brazed, the groove width (W2) of the sub-groove provided at the groove bottom of the main groove is 0.005 to 0.40 mm, preferably 0.005 to 0.35 mm, and particularly preferably 0.005 to 0.30 mm in any groove. By making the groove width (W2) of the sub-groove within the above range, the wettability and diffusivity of the brazing material to the component to be brazed during brazing heating becomes higher, so that good brazing properties can be ensured. On the other hand, if the groove width (W2) of the sub-groove is less than the above range, the flow path of the molten brazing material is narrow, so that a sound brazing joint cannot be formed and good brazing properties cannot be ensured. In addition, if it exceeds the above range, the molten brazing material fills the groove and is consumed, and the amount of brazing material becomes insufficient, so that good brazing properties cannot be ensured.

[0113] In the aluminum member (2) to be brazed, the ratio (W2 / D2) of the groove width (W2) of the sub-groove to the groove depth (D2) of the sub-groove is 10.00 or less in any groove, preferably 0.20 to 5.00, and particularly preferably 0.50 to 5.00. By making W2 / D2 within the above range, the wettability and diffusibility of the brazing material to the member to be brazed during brazing heating becomes high, thereby ensuring good brazing properties. On the other hand, if W2 / D2 exceeds the above range, the capillary phenomenon does not work sufficiently, and a sound brazing joint cannot be formed.

[0114] In the aluminum member (2) to be brazed, the ratio (D2 / D3) of the groove depth (D2) of the secondary groove to the groove depth (D3) of the primary groove is 0.50 or more and less than 1.00, preferably 0.60 to 0.95, and particularly preferably 0.70 to 0.95. By making D2 / D3 within the above range, the wettability and diffusibility of the brazing material to the member to be brazed during brazing heating becomes high, thereby ensuring good brazing properties. On the other hand, if D2 / D3 exceeds the above range, the capillary phenomenon does not work sufficiently, and a sound brazing joint cannot be formed.

[0115] In an aluminum component (2) to be brazed, the groove width (W3) of the main groove formed on the surface of the aluminum component to be brazed at the weld corner forming position can be appropriately selected based on the number of sub-grooves, the groove width (W2) of the sub-grooves, the spacing between adjacent sub-grooves, etc.

[0116] In an aluminum component (2) to be brazed, the groove depth (D2) of the secondary groove refers to: the distance between the deepest part of the secondary groove and the line connecting the highest part of the groove surface of the secondary groove in a cross section cut along a direction perpendicular to the extension direction of the groove (width direction). The groove width (W2) of the secondary groove refers to: the distance between the highest parts of the groove surface on both sides of the width direction of the secondary groove in a cross section cut along a direction perpendicular to the extension direction of the groove (width direction). The groove depth (D3) of the main groove refers to: the distance between the deepest part of the secondary groove and the extension line of the non-formed part of the groove in a cross section cut along a direction perpendicular to the extension direction of the groove (width direction). The groove width (W3) of the main groove refers to: the distance between the highest parts of the groove surface of the main groove in a cross section cut along a direction perpendicular to the extension direction of the groove (width direction).

[0117] In the aluminum component (2) to be brazed, the cross-sectional shape of the main groove and the secondary groove when the groove is cut in the width direction may be a substantially triangular shape or a substantially quadrilateral shape, and the shape of the groove surface of the secondary groove may be a substantially V-shape. In addition, in the aluminum component (2) to be brazed, a flat portion may exist between adjacent secondary grooves, or a flat portion may not exist between adjacent secondary grooves. In addition, in the aluminum component (2) to be brazed, a ridge may be formed on the upper part of the groove surface of the main groove, in which the highest part is higher than the position of the extension line of the non-formed part of the groove.

[0118] Reference Figure 6-7 , the main groove and the sub-groove formed in the aluminum component (2) to be brazed are described in detail. Figure 6-7 A schematic cross-sectional view showing an example of the configuration of a main groove and a sub-groove formed in an aluminum member (2) to be brazed. Figure 6In the figure, the groove depth (D2) of the auxiliary groove 12 refers to the distance between the deepest part 17 of the auxiliary groove 12 and the line 18 connecting the highest part 16 of the groove surface 15 of the auxiliary groove 12. The groove width (W2) of the auxiliary groove 12 refers to the distance between the highest parts 16 of the groove surface 15 on both sides of the width direction of the auxiliary groove 2. The groove depth (D3) of the main groove 11 refers to the distance between the deepest part 17 of the auxiliary groove 12 and the extension line 23 of the non-formed part 13 of the groove. The groove width (W3) of the main groove 11 refers to the distance between the highest parts 22 of the groove surface 21 of the main groove 11.

[0119] Figure 6 In the embodiment shown, a secondary groove 12 is provided at the bottom of the main groove 11, and the cross-sectional shape of the secondary groove 12 when the main groove 11 and the secondary groove 12 are cut in the width direction is substantially triangular, and the groove surface 15 of the secondary groove 12 is substantially V-shaped. Figure 6 In the illustrated embodiment, the highest portion 16 of the groove surface 15 of one auxiliary groove 12 overlaps with the highest portion 16 of the groove surface 15 of the adjacent auxiliary groove 12 at the position of the line 18 connecting the highest portions 16 of the groove surfaces 15 of the auxiliary grooves 12. Figure 6 In the embodiment shown, the flat portion of the sub-groove does not exist between adjacent sub-grooves, and the interval between adjacent sub-grooves is 0.0 mm. Figure 6 In the illustrated embodiment, the distance between the deepest part 17 of the auxiliary groove 12 and the line 18 connecting the highest part 16 of the groove surface 15 of the auxiliary groove 12 is the groove depth (D2) of the auxiliary groove, and the distance between the highest parts 16 of the groove surface 15 on both sides of the width direction of the auxiliary groove 12 is the groove width (W2) of the auxiliary groove 12. In addition, the distance between the deepest part 17 of the auxiliary groove 12 and the extension line 23 of the non-formed part 13 of the groove is the groove depth (D3) of the main groove, and the distance between the highest parts 22 of the groove surface 21 on both sides of the main groove 11 is the groove width (W3) of the main groove 11.

[0120] Figure 7 In the embodiment shown, a secondary groove 1 is provided at the bottom of the main groove 11, and the cross-sectional shape of the secondary groove 12 when the main groove 11 and the secondary groove 12 are cut in the width direction is roughly triangular, and the groove surface 15 of the secondary groove 12 is roughly V-shaped. Figure 7 In the illustrated embodiment, the highest portion 16 of the groove surface 15 of one auxiliary groove 12 overlaps with the highest portion 16 of the groove surface 15 of the adjacent auxiliary groove 12 at the position of the line 18 connecting the highest portions 16 of the groove surfaces 15 of the auxiliary grooves 12. Figure 7 In the embodiment shown, the flat portion of the sub-groove does not exist between adjacent sub-grooves, and the interval between adjacent sub-grooves is 0.0 mm. Figure 7 In the embodiment shown, a raised portion 19 is formed on the upper portion of the groove surface 21 of the main groove 11, where the highest portion 22 is higher than the position of the groove non-formed portion 13. Figure 7In the illustrated embodiment, the distance between the deepest part 17 of the auxiliary groove 12 and the line 18 connecting the highest part 16 of the groove surface 15 of the auxiliary groove 12 is the groove depth (D2) of the auxiliary groove, and the distance between the highest parts 16 of the groove surface 15 on both sides of the width direction of the auxiliary groove 12 is the groove width (W2) of the auxiliary groove 12. In addition, the distance between the deepest part 17 of the auxiliary groove 12 and the extension line 23 of the non-formed part 13 of the groove is the groove depth (D3) of the main groove, and the distance between the highest parts 22 of the groove surface 21 on both sides of the main groove 11 is the groove width (W3) of the main groove 11.

[0121] In the aluminum member (1 or 2) to be brazed, grooves are provided in the surface of the aluminum member (1 or 2) to be brazed in a range of a weld angle. It should be noted that, hereinafter, in the aluminum member (1) to be brazed, the position where grooves are provided means: a position where two or more grooves are provided, and in the aluminum member (2) to be brazed, the position where grooves are provided means: a position where a main groove and a sub-groove are provided.

[0122] The positions of the surfaces of the aluminum components (1 or 2) to be brazed, where the grooves are provided, are described in detail. Figure 8 It is a schematic perspective view showing an example of the shape of the pipe material before assembly. Fig. 9 Schematic perspective views showing examples of the form of the plate members before assembly, (A) is a view viewed from the surface 421 side, and (B) is a view viewed from the surface 422 side. Fig.10 This is a schematic perspective view showing an example of the form of a combined pipe and plate. The pipe 31 formed into a pipe shape passes through the through hole 38 of the plate 32 to assemble the assembly 30 before brazing. Then, the assembly 30 is heated by brazing to form a fillet at the joint portion to produce a brazed body (not shown).

[0123] (1) When the pipe material 1 is a member (1 or 2) made of aluminum to be brazed, and the plate material 2 is a member formed of the brazing sheet of the present invention, the portion indicated by reference numeral 36 in the pipe material 1 is a portion facing the member formed of the brazing sheet, and the portions indicated by reference numerals 35 and 37 are portions not facing the member formed of the brazing sheet. The range combining the portions 35, 36, and 37 is the range of the fillet formation of the member (1 or 2) made of aluminum to be brazed.

[0124] In the case of (1), the groove may be formed at any position in the fillet forming range. That is, the groove may be formed at any one of the portions 35, 36, and 37. It is preferred that the groove be formed at least in the portion 36, and it is particularly preferred that the groove be formed in all of the portions 35, 36, and 37.

[0125] (2) When the plate 1 is a member (1 or 2) to be brazed made of aluminum, and the pipe 2 is a member formed of the brazing sheet of the present invention, the portion indicated by reference numeral 39 in the plate 2 is a portion facing the member formed of the brazing sheet, and the portions indicated by reference numerals 40 and 41 are portions not facing the member formed of the brazing sheet. The range combining the portions 39, 40, and 41 is the range of the fillet formation of the member (1 or 2) to be brazed made of aluminum.

[0126] In the case of (2), the groove may be formed at any position in the fillet forming range. That is, the groove may be formed at any one of the portions 39, 40, and 41. It is preferred that the groove be formed at least in the portion 39, and it is particularly preferred that the groove be formed in all of the portions 39, 40, and 41.

[0127] In the aluminum member (1 or 2) to be brazed, the direction in which the groove extends is the length direction of the formed weld fillet. The length direction of the formed weld fillet is a direction orthogonal to the width direction of the formed weld fillet.

[0128] In the aluminum member to be brazed (1 or 2), the direction in which the groove extends is described in detail. Fig.11 For Fig. 9 The plate material shown is a diagram showing the direction in which the grooves extend, (A) is a diagram obtained by observing the side of the surface 421 (422), and (B) is a cross-sectional diagram along the line XX in (A). Fig.12 For Figure 8 A diagram of the pipe shown, showing the direction in which the grooves extend. Fig.11 In the embodiment, the direction in which the groove extends is the direction indicated by reference numeral 421 (422) in portion 40 (41), and is the direction indicated by reference numeral 42 in portion 39. Fig.11 In the embodiment, the weld fillet is formed in a manner of surrounding the joint portion between the plate and the pipe, and therefore, the directions 421 (422), 42 of the groove extension are the length directions of the weld fillet formed. That is, Fig.11 In the embodiment, the directions 421 (422), 421 in which the grooves extend are directions orthogonal to the width direction 44 of the fillet to be formed. Fig.12 In the embodiment, the direction in which the groove extends is the direction indicated by reference numeral 431 in portion 35, the direction indicated by reference numeral 432 in portion 36, and the direction indicated by reference numeral 433 in portion 37. Fig.12 In the welding angle Fig.12 The groove is formed in a manner of surrounding the joint portion between the plate and the pipe, so the directions 431, 432, and 433 in which the grooves extend are the length directions of the formed weld fillets. That is, Fig.12 In FIG. 4 , directions 431 , 432 , and 433 in which the grooves extend are directions orthogonal to a width direction 44 of the fillet to be formed.

[0129] In the aluminum member to be brazed (1 or 2), the groove may be continuous from one end to the other end, or may have a discontinuous portion in the middle to such an extent that the effect of the present invention is not impaired. Fig.13 The groove 45 of the embodiment shown in (A) is a groove that is continuous from one end to the other end. Fig.13 In the groove 46 of the embodiment shown in (B), there is a discontinuous portion 47 in the middle.

[0130] When the aluminum member (1 or 2) to be brazed is a tube formed from a plate-like material into a tube shape, the plate thickness is about 0.15 to 0.50 mm, and the coverage rate of the skin material when the tube is a cladding material is generally about 5 to 30%. In addition, when the aluminum member (1 or 2) to be brazed is a plate material formed from a plate-like material into a plate shape, the plate thickness is about 0.80 to 5.00 mm, and the coverage rate of the skin material when the plate material is a cladding material is about 5 to 30%.

[0131] When the aluminum component (1 or 2) to be brazed is an extruded pipe for a refrigerant passage, the outer diameter of the pipe is about 6.0 to 20.0 mm, and the coverage rate of the skin material used to cover the pipe is generally about 3 to 30%. In addition, when the aluminum component (1 or 2) to be brazed is an extruded porous tube for a refrigerant passage, the width of the porous tube is about 10.0 to 100 mm, the thickness is about 1.0 to 3.0 mm, the wall thickness is about 0.10 mm to 0.30 mm, and the number of holes in the porous tube is about 2 to 30.

[0132] A method for manufacturing an aluminum component (1 or 2) to be brazed is described. When the aluminum component (1 or 2) to be brazed is a molded body of a bare sheet of plate material, first, an aluminum alloy having a desired component composition used in the bare sheet, and in the case of a molded body of a clad sheet of plate material, an aluminum alloy having a desired component composition used in a core material and a clad layer coated on the core material is melted and cast, respectively, to produce an ingot for the bare sheet, or an ingot for the core material and an ingot for the clad layer. These melting and casting methods are not particularly limited, and a common method is used.

[0133] Next, the ingot is subjected to a homogenization treatment as required. The preferred temperature range for the homogenization treatment is 400 to 630° C. and the homogenization treatment time is 2 to 20 hours.

[0134] Next, the bare material ingot and the core material ingot are face-turned, and the cladding layer ingot is face-turned, and then hot-rolled to a predetermined thickness. The cladding material is formed by stacking the core material and the cladding layer ingots in a predetermined order.

[0135] In the hot working, in the case of a bare material, a predetermined bare material ingot is hot rolled at 400 to 550° C., and in the case of a clad material, a laminate of a core material ingot and a cladding layer ingot laminated in a predetermined order is hot rolled at 400 to 550° C. In the hot rolling, the sheet is rolled to a thickness of, for example, 2.0 to 8.0 mm.

[0136] In the cold working, the hot rolled product obtained by hot working is cold rolled. In the cold working, the cold rolling is performed in a plurality of passes.

[0137] In the case of performing intermediate annealing between cold rolling passes during cold working, the intermediate annealing temperature is 200 to 500° C., preferably 250 to 400° C. During the intermediate annealing, the temperature may be raised to the intermediate annealing temperature, and cooling may be started quickly after reaching the intermediate annealing temperature, or after reaching the intermediate annealing temperature, the temperature may be maintained at the intermediate annealing temperature for a constant time before cooling is started. The holding time at the intermediate annealing temperature is 0 to 10 hours, preferably 1 to 5 hours.

[0138] The cold rolled product obtained by cold working after cold rolling is subjected to final annealing at 300 to 500°C, preferably 350 to 450°C. In the final annealing, the temperature may be raised to the final annealing temperature, and after reaching the final annealing temperature, the product may be rapidly cooled, or after reaching the final annealing temperature, the product may be kept at the final annealing temperature for a constant time and then cooled. The holding time at the final annealing temperature is 0 to 10 hours, preferably 1 to 5 hours. It should be noted that in the case of a pipe, the final annealing may or may not be performed.

[0139] In this way, a plate-shaped bare material or a coated material is obtained.

[0140] For plate-like bare or coated materials, the bare or coated materials are etched before brazing, thereby further improving the brazing properties. As the acid, an aqueous solution containing one or more of sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid and hydrofluoric acid can be used. The preferred etching amount range is 0.05 to 2.0 g / m 2 .

[0141] After forming grooves at predetermined positions of the plate-shaped bare material or coated material thus obtained, the material is molded into a predetermined shape of an aluminum member (1 or 2) to be brazed, or when the material is molded into a predetermined shape of an aluminum member (1 or 2) to be brazed, a groove is simultaneously formed at a predetermined position, thereby obtaining an aluminum member (1 or 2) to be brazed. It should be noted that as long as the predetermined groove is provided within the range of the weld angle formation, the groove may be provided beyond the range of the weld angle formation.

[0142] In the present invention, the method for providing a groove at a predetermined position of an aluminum component (1 or 2) to be brazed is not particularly limited, and for example, a known method is preferably used. As a method for providing a groove at a predetermined position, for example, the following method can be cited: when a plate is press-formed, the plate is compressed by a pressurizing die, and a groove is provided at a predetermined position on the surface of the plate; after pressurization, a tool is made to slide, and a groove is provided at a predetermined position on the surface of the plate. In addition, as a method for providing a groove at a predetermined position, for example, the following method can be cited: when punching a hole for inserting a pipe in a plate, a convex portion is provided on the side of the stamping die, and a convex portion is provided on the cut surface of the hole of the plate (if it is Fig. 9 In the embodiment shown in the figure, a method of providing a groove in the portion 39) facing the brazing plate; a method of providing a groove by sliding a tool along the length direction and circumferential direction of the tube after punching. In addition, as a method of providing a groove at a predetermined position, for example, the following methods can be cited: a method of providing a groove at a predetermined position on the surface of the tube by pushing a tool along the traveling direction of the tube when forming the tube; a method of providing a groove at a predetermined position on the surface of the tube by sliding a tool on the tube when assembling the tube and the plate.

[0143] When the aluminum component (1 or 2) to be brazed is an extruded piping material, the molten aluminum alloy is cast into an ingot according to a conventional method to obtain an ingot (billet) having a specified composition. Next, the obtained ingot (billet) is homogenized, and the billet is reheated during extrusion, and a split die extrusion (porthole extrusion) is performed in such a way that the wall thickness of the tube after extrusion becomes a specific size to produce an extruded piping material. The preferred temperature range for the homogenization treatment is 400 to 630°C, and the homogenization treatment time is 2 to 20 hours. The preferred extrusion temperature range is 400°C to 550°C. The preferred extrusion ratio is 10 to 200. The preferred range of the wall thickness of the tube after extrusion is 0.50 to 10.00 mm.

[0144] The extruded pipe material is further subjected to drawing, softening treatment is performed as needed, and then drawing is performed, and a final softening treatment is performed as needed. The preferred temperature range for the softening treatment is 300 to 500° C., and the softening treatment time is 0 to 10 hours. The preferred range for the final wall thickness of the drawn pipe is 0.10 to 3.0 mm.

[0145] For extruded piping materials, the brazing properties can be further improved by etching the extruded piping before brazing. As the acid, an aqueous solution containing one or more of sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid and hydrofluoric acid can be used. The preferred etching amount range is 0.05 to 2.0 g / m 2 .

[0146] By forming grooves at predetermined positions of the extruded pipe material thus obtained, an aluminum member (1 or 2) to be brazed is obtained. It should be noted that when the grooves are provided in the portion forming the fillet, it is sufficient to provide the predetermined grooves in the portion forming the fillet, and the grooves may be provided beyond the portion forming the fillet.

[0147] In the present invention, there is no particular limitation on the method for providing a groove at a predetermined position of an aluminum member (1 or 2) to be brazed, and for example, a known method is preferably used. As a method for providing a groove at a predetermined position, the following methods can be cited: when using an extruded tubing material as a top plate, for example, a method of sliding a tool while rotating the extruded tubing material to form a groove in the range of the weld angle of the extruded tubing material; a method of sliding a tool while continuously feeding in the length direction to form a groove in the range of the weld angle of the extruded tubing material. In addition, as a method for providing a groove at a predetermined position, for example, the following methods can be cited: when punching a hole for inserting the tubing material, a convex portion is provided on the side of the punching die to provide a groove on the cut surface; a method of sliding the tool along the length direction and circumferential direction of the tube after the punching process to provide a groove on the cut surface. In addition, as a method for setting a groove at a specified position, the following methods can be cited: when using an extruded piping material as the pipe, when feeding the extruded piping material, a tool is pushed along the traveling direction of the pipe, thereby setting a groove at a specified position on the surface of the extruded piping material; when assembling the pipe and the plate, a tool is made to slide on the pipe, thereby setting a groove at a specified position on the surface of the pipe.

[0148] When the aluminum component (1 or 2) to be brazed is an extruded porous tube, the molten aluminum alloy is cast into an ingot according to a conventional method to obtain an ingot (billet) having a specified composition. Next, the obtained ingot (billet) is homogenized, and the billet is reheated during extrusion, and extruded through a split die in such a way that the wall thickness of the tube after extrusion becomes a specific size to produce an extruded porous tube. The preferred temperature range for the homogenization treatment is 400 to 630°C, and the homogenization treatment time is 2 to 20 hours. The preferred extrusion temperature range is 400°C to 550°C. The preferred extrusion ratio is 50 to 2500.

[0149] Afterwards, a final softening treatment is performed as required. The preferred temperature range for the final softening treatment is 300 to 500° C., and the softening treatment time is 0 to 50 hours. The obtained extruded porous tube is shaped to improve the external dimension accuracy. The preferred range of the processing degree at this time is 0.5 to 10%.

[0150] For extruded porous pipes, the brazing performance is further improved by etching the extruded pipe before brazing. As the acid, an aqueous solution containing one or more of sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid and hydrofluoric acid can be used. The preferred etching amount range is 0.05 to 2.0 g / m 2 .

[0151] By forming grooves at predetermined positions of the extruded porous tube thus obtained, an aluminum member to be brazed (1 or 2) is obtained. It should be noted that the predetermined grooves may be provided within the fillet forming range or may be provided outside the fillet forming range.

[0152] In the present invention, the method for providing a groove at a predetermined position of the aluminum member (1 or 2) to be brazed is not particularly limited, and for example, a known method is preferably used. As a method for providing a groove at a predetermined position, the following methods can be cited: when an extruded porous tube is used as a tube, a cutter is pushed along the traveling direction of the tube when the extruded porous tube is fed out, thereby providing a groove at a predetermined position on the surface of the extruded porous tube; when assembling the tube and the plate, a cutter is made to slide on the tube, thereby providing a groove at a predetermined position on the surface of the tube.

[0153] A method for manufacturing a brazed body according to a first aspect of the present invention is a method for manufacturing a brazed body, characterized in that the method comprises assembling a member formed of a brazing plate and an aluminum member to be brazed, and then performing brazing heating to manufacture the brazed body.

[0154] The brazing material of the brazing sheet is formed of an aluminum alloy containing 3.00 to 13.00 mass % of Si and 2.00 mass % or less of Mg (excluding zero), and the balance is aluminum and inevitable impurities, and the core material is formed of the aluminum alloy.

[0155] On the surface of the aluminum component to be brazed, there are two or more grooves in the area where the weld fillet is formed, the groove depth (D1) of the groove is 0.005 to 0.50 mm, the groove width (W1) of the groove is 0.005 to 0.50 mm, the ratio (W1 / D1) of the groove width (W1) to the groove depth (D1) is less than 10.00, and the interval (P1) between adjacent grooves is 0.00 to 0.30 mm.

[0156] A second method for manufacturing a brazed body according to the present invention is a method for manufacturing a brazed body, characterized in that the brazed body is manufactured by assembling a member formed of a brazing plate and an aluminum member to be brazed, and then performing brazing heating.

[0157] The brazing material of the brazing sheet is formed of an aluminum alloy containing 3.00 to 13.00 mass % of Si and 2.00 mass % or less of Mg (excluding zero), and the balance is aluminum and inevitable impurities, and the core material is formed of the aluminum alloy.

[0158] A main groove and two or more sub-grooves arranged at the groove bottom of the main groove are provided on the surface of the weld fillet forming area of ​​the aluminum component to be hard-brazed, the groove depth (D2) of the sub-groove is 0.005 to 0.50 mm, the groove width (W2) of the sub-groove is 0.005 to 0.40 mm, the ratio (W2 / D2) of the groove width (W2) of the sub-groove to the groove depth (D2) of the sub-groove is less than 10.00, and the ratio (D2 / D3) of the groove depth (D2) of the sub-groove to the groove depth (D3) of the main groove is greater than 0.50 and less than 1.00.

[0159] That is, the first aspect of the present invention is a method for manufacturing a brazed body as follows: using the aluminum component (1) to be brazed as the component to be brazed, using the component formed by the brazing plate of the present invention as the component formed by the brazing plate, at least assembling the component formed by the brazing plate of the present invention and the aluminum component (1) to be brazed, and after making an assembly, brazing heating is performed without using a flux, thereby manufacturing a brazed body. In addition, the second aspect of the present invention is a method for manufacturing a brazed body as follows: using the aluminum component (2) to be brazed as the component to be brazed, using the component formed by the brazing plate of the present invention as the component formed by the brazing plate, at least assembling the component formed by the brazing plate of the present invention and the aluminum component (2) to be brazed, and after making an assembly, brazing heating is performed without using a flux, thereby manufacturing a brazed body.

[0160] The brazed component of the method for manufacturing a brazed body according to the first embodiment of the present invention is the same as the aluminum component to be brazed (1). The brazed component of the method for manufacturing a brazed body according to the second embodiment of the present invention is the same as the aluminum component to be brazed (2). The component formed by the brazing sheet in the method for manufacturing a brazed body according to the first embodiment of the present invention and the method for manufacturing a brazed body according to the second embodiment of the present invention is the same as the component formed by the brazing sheet of the present invention.

[0161] In the first and second methods of manufacturing a brazed body according to the present invention, at least components formed by brazing plates and components to be brazed are assembled, but in addition to these, bare fins, piping, blocks and other components may be assembled as needed to produce an assembly.

[0162] In the first method for manufacturing a brazed body according to the present invention and the second method for manufacturing a brazed body according to the present invention, the obtained assembly is brazed and heated without using a flux, thereby brazing to obtain a brazed body. That is, the first method for manufacturing a brazed body according to the present invention and the second method for manufacturing a brazed body according to the present invention are methods for manufacturing a brazed body based on a flux-free brazing method.

[0163] In the first method for manufacturing a brazed body of the present invention and the second method for manufacturing a brazed body of the present invention, the brazing heating temperature when heating the brazed body for brazing is, for example, 577 to 610°C, preferably 590 to 600°C. In addition, the brazing heating time is, for example, as follows: 5 to 20 minutes at or above 590°C, preferably 5 to 10 minutes. In addition, the brazing atmosphere is an inactive gas atmosphere such as nitrogen.

[0164] The brazed body produced by the first and second brazed body production methods of the present invention is not particularly limited, and examples thereof include aluminum alloy heat exchangers and radiators for household use, automotive use, and various industrial uses.

[0165] Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to the following Examples.

[0166] Example

[0167] In the following examples and comparative examples, joints between a brazed component having grooves and a brazing plate were prepared to evaluate brazing properties. It should be noted that, in the aluminum component to be brazed of the present invention, the brazed component having grooves may be a molded body of a plate material, or may be an extruded pipe or an extruded porous pipe, and the brazing properties are the same as the brazing properties of the joint between a brazed component having grooves and a brazing plate shown below.

[0168] (Examples and Comparative Examples)

[0169] As the brazed component, a 3003 alloy ingot was produced by continuous casting, and after surface turning to a predetermined thickness, it was homogenized, hot rolled, cold rolled, and annealed to produce a plate material with a thickness of 1.0 mm. The obtained plate material was then pickled. Fig.14 The grooves are shown as follows: a groove is provided in the 3-1 part, a groove is provided in the 3-2 part, a groove is provided in the 3-3 part, a groove is provided in both the 3-2 part and the 3-3 part, and a groove is provided in the 3-1 part, the 3-2 part, and the 3-3 part. Figure 1 Where W1, D1 and P1 are the values ​​shown in Table 2, and Figure 6W2, D2 and D3 are the values ​​shown in Table 3.

[0170] Regarding the brazing plate combined with the brazing component, an ingot for brazing material, an ingot for core material, and an ingot for skin material having the chemical composition shown in Table 1 are produced by continuous casting. Next, the ingot for core material is homogenized, and the core material ingot is subjected to surface turning to make the plate thickness reach a specified thickness. For the ingot for brazing material and the ingot for skin material, after homogenization, they are turned and hot rolled to make the plate thickness reach a specified thickness. The ingot for brazing material, the ingot for skin material, and the ingot for core material thus obtained are overlapped in the combination shown in Table 1 to produce a laminate. The obtained laminate is hot rolled, and the ingot for core material, the ingot for brazing material, and the ingot for skin material are joined to produce a clad material with a plate thickness of 3.00 mm. The obtained clad material is sequentially cold rolled, finally annealed, and pickled to obtain a test material with a plate thickness of 0.80 mm.

[0171] <Evaluation of brazing properties>

[0172] The brazing properties of each test material were evaluated by the gap filling test. Fig.15 As shown in FIG. 1 , a member to be brazed with grooves is arranged on a vertical plate, and a brazing plate is arranged on a horizontal plate. The grooves of the vertical plate and the horizontal plate are close to each other, and the brazing is performed in a furnace in a nitrogen atmosphere. The atmosphere in the furnace is as follows: the oxygen concentration is set to 10 volume ppm or less, and the temperature of the test body is set to 600°C.

[0173] In the gap filling test, the brazing property is evaluated based on the length FL of the fillet formed after brazing. The "Gap Filling Test" column in Tables 2 and 3 records FL, and when it is 15 mm or more, it has excellent brazing property, and when it is 12 mm or more, it has good brazing property and is judged as qualified, and when it is less than 12 mm, it is judged as poor brazing property and unqualified.

[0174] [Table 1]

[0175]

[0176] [Table 2]

[0177]

[0178] ·: Indicates the position assigned to the slot

[0179] [Table 3]

[0180]

[0181] ·: Indicates the position assigned to the slot

[0182] As shown in Tables 2 and 3, it was confirmed that the test materials of the Examples, which are examples of the present invention, achieved excellent bonding conditions at an acceptable level.

Claims

1. A brazing body, characterized in that: The present invention relates to a brazing body obtained by brazing a component formed of a brazing plate and a component to be brazed made of aluminum, wherein the brazing plate comprises at least: a core material formed of an aluminum alloy; and a brazing material formed of an aluminum alloy containing 3.00 to 13.00 mass % of Si and more than 0.00 mass % and less than 2.00 mass % of Mg, with the balance being aluminum and inevitable impurities. Two or more grooves are provided on the surface of the fillet forming area of ​​the aluminum member to be brazed, the groove depth (D1) of the grooves is 0.005 to 0.10 mm, the groove width (W1) of the grooves is 0.005 to 0.30 mm, the ratio (W1 / D1) of the groove width (W1) to the groove depth (D1) is 10.00 or less, and the interval (P1) between adjacent grooves is 0.00 to 0.30 mm, A fillet is formed by the brazing material of the brazing plate flowing into the groove.

2. A brazing body, characterized in that: The present invention relates to a brazing body obtained by brazing a component formed of a brazing plate and a component to be brazed made of aluminum, wherein the brazing plate comprises at least: a core material formed of an aluminum alloy; and a brazing material formed of an aluminum alloy containing 3.00 to 13.00 mass % of Si and more than 0.00 mass % and less than 2.00 mass % of Mg, with the balance being aluminum and inevitable impurities. A main groove and two or more sub-grooves arranged at the groove bottom of the main groove are provided on the surface of the weld fillet forming area of ​​the aluminum component to be hard-brazed, the groove depth (D2) of the sub-groove is 0.005 to 0.50 mm, the groove width (W2) of the sub-groove is 0.005 to 0.40 mm, the ratio (W2 / D2) of the groove width (W2) of the sub-groove to the groove depth (D2) of the sub-groove is less than 10.00, and the ratio (D2 / D3) of the groove depth (D2) of the sub-groove to the groove depth (D3) of the main groove is greater than 0.50 and less than 1.

00.

3. The brazing body according to claim 1 or 2, characterized in that The aluminum alloy forming the aluminum component to be brazed is an aluminum alloy containing any one or more of 1.50 mass % Si, 1.00 mass % Fe, 1.20 mass % Cu, 2.00 mass % Mn, 3.00 mass % Mg, 8.00 mass % Zn, 0.30 mass % Cr, 0.30 mass % Ti, 0.30 mass % Zr, 0.10 mass % In, 0.10 mass % Sn, 1.00 mass % Bi, 0.05 mass % Na, 0.05 mass % Sr and 0.05 mass % Sb, with the balance consisting of aluminum and unavoidable impurities.

4. The brazing body according to claim 1 or 2, characterized in that: The brazing material of the brazing plate further contains any one or two or more of 1.00 mass % or less of Bi, 1.00 mass % or less of Fe, 1.20 mass % or less of Cu, 2.00 mass % or less of Mn, 8.00 mass % or less of Zn, 0.30 mass % or less of Cr, 0.30 mass % or less of Ti, 0.30 mass % or less of Zr, 0.10 mass % or less of In, 0.10 mass % or less of Sn, 0.05 mass % or less of Na, 0.05 mass % or less of Sr and 0.05 mass % or less of Sb.

5. The brazing body according to claim 1 or 2, characterized in that: The core material of the brazing sheet is an aluminum alloy containing any one or more of 1.50 mass % Si, 1.00 mass % Fe, 1.20 mass % Cu, 2.00 mass % Mn, 3.00 mass % Mg, 8.00 mass % Zn, 0.30 mass % Cr, 0.30 mass % Ti, 0.30 mass % Zr, 0.10 mass % In, 0.10 mass % Sn, 1.00 mass % Bi, 0.05 mass % Na, 0.05 mass % Sr and 0.05 mass % Sb, with the balance being aluminum and unavoidable impurities.

6. A method for manufacturing a brazing body, characterized in that: This is a method for manufacturing a brazed body by assembling a member formed of a brazing sheet and an aluminum member to be brazed, and then performing brazing heating without using a flux. The brazing material of the brazing sheet is formed of an aluminum alloy containing 3.00 to 13.00 mass % of Si and more than 0.00 mass % and less than 2.00 mass % of Mg, with the balance being aluminum and inevitable impurities, and the core material is formed of the aluminum alloy. On the surface of the aluminum component to be brazed, there are two or more grooves in the area where the weld fillet is formed, the groove depth (D1) of the groove is 0.005 to 0.10 mm, the groove width (W1) of the groove is 0.005 to 0.30 mm, the ratio (W1 / D1) of the groove width (W1) to the groove depth (D1) is less than 10.00, and the interval (P1) between adjacent grooves is 0.00 to 0.30 mm.

7. A method for manufacturing a brazing body, characterized in that: This is a method for manufacturing a brazed body by assembling a member formed of a brazing sheet and an aluminum member to be brazed, and then performing brazing heating without using a flux. The brazing material of the brazing sheet is formed of an aluminum alloy containing 3.00 to 13.00 mass % of Si and more than 0.00 mass % and less than 2.00 mass % of Mg, with the balance being aluminum and inevitable impurities, and the core material is formed of the aluminum alloy. A main groove and two or more sub-grooves arranged at the groove bottom of the main groove are provided on the surface of the weld fillet forming area of ​​the aluminum component to be hard-brazed, the groove depth (D2) of the sub-groove is 0.005 to 0.50 mm, the groove width (W2) of the sub-groove is 0.005 to 0.40 mm, the ratio (W2 / D2) of the groove width (W2) of the sub-groove to the groove depth (D2) of the sub-groove is less than 10.00, and the ratio (D2 / D3) of the groove depth (D2) of the sub-groove to the groove depth (D3) of the main groove is greater than 0.50 and less than 1.

00.

8. The method for producing a brazed body according to claim 6 or 7, characterized in that: The aluminum component to be brazed is formed by an aluminum alloy containing any one or more of 1.50 mass % Si, 1.00 mass % Fe, 1.20 mass % Cu, 2.00 mass % Mn, 3.00 mass % Mg, 8.00 mass % Zn, 0.30 mass % Cr, 0.30 mass % Ti, 0.30 mass % Zr, 0.10 mass % In, 0.10 mass % Sn, 1.00 mass % Bi, 0.05 mass % Na, 0.05 mass % Sr and 0.05 mass % Sb, with the balance being aluminum and unavoidable impurities.

9. The method for producing a brazed body according to claim 6 or 7, characterized in that: The brazing material of the aluminum alloy brazing plate further contains any one or two or more of 1.00 mass % or less of Bi, 1.00 mass % or less of Fe, 1.20 mass % or less of Cu, 2.00 mass % or less of Mn, 8.00 mass % or less of Zn, 0.30 mass % or less of Cr, 0.30 mass % or less of Ti, 0.30 mass % or less of Zr, 0.10 mass % or less of In, 0.10 mass % or less of Sn, 0.05 mass % or less of Na, 0.05 mass % or less of Sr and 0.05 mass % or less of Sb.

10. The method for producing a brazed body according to claim 6 or 7, characterized in that: The core material of the aluminum alloy brazing sheet is formed of an aluminum alloy containing any one or two or more of 1.50 mass % Si, 1.00 mass % Fe, 1.20 mass % Cu, 2.00 mass % Mn, 3.00 mass % Mg, 8.00 mass % Zn, 0.30 mass % Cr, 0.30 mass % Ti, 0.30 mass % Zr, 0.10 mass % In, 0.10 mass % Sn, 1.00 mass % Bi, 0.05 mass % Na, 0.05 mass % Sr and 0.05 mass % Sb, with the balance being aluminum and unavoidable impurities.

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