Shielding gas ana method for producing aluminum alloy joint

Abstract

To provide a shielding gas and a method for producing an aluminum alloy joint, which make it possible to suppress the generation of spatter while allowing a sufficient amount of penetration of an aluminum alloy wrought material.SOLUTION: The shielding gas is used for arc welding between an aluminum alloy die-cast material and an aluminum alloy wrought material. The shielding gas contains 5 vol.% or more and 20 vol.% or less of helium, and the remainder of the shielding gas is composed of argon.SELECTED DRAWING: Figure 1B

Description

[Technical Field]

[0001] The present disclosure relates to a shielding gas and a method for producing an aluminum alloy joined body. [Background technology]

[0002] There is known a method for manufacturing an aluminum alloy joined body by welding two aluminum alloy materials by arc welding. In arc welding, penetration is formed from adjacent portions of two aluminum alloy materials to join the two aluminum alloy materials. For example, it is known to weld an aluminum alloy die-cast material and an aluminum alloy wrought material by arc welding (see Patent Document 1 below). In the arc welding described in Patent Document 1, a shielding gas made of argon is used. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-320098 Summary of the Invention [Problem to be solved by the invention]

[0004] In the arc welding described in Patent Document 1, the amount of penetration of the wrought aluminum alloy material is insufficient, which reduces the joining strength of the wrought aluminum alloy material to the die-cast aluminum alloy material.

[0005] On the other hand, in arc welding, it is necessary to suppress the generation of spatter.

[0006] The present disclosure provides a shielding gas and a method for manufacturing an aluminum alloy joined body that can suppress the generation of spatter while forming a sufficient amount of aluminum alloy wrought material. [Means for solving the problem]

[0007] The shielding gas disclosed herein is used for arc welding of aluminum alloy die-cast material and aluminum alloy wrought material. The shielding gas contains 5% to 20% by volume of helium, with the remainder of the helium in the shielding gas being argon.

[0008] The method for manufacturing an aluminum alloy joined body of the present disclosure includes a first step of arranging an aluminum alloy die-cast material and an aluminum alloy wrought material adjacent to each other, and a second step of welding the aluminum alloy die-cast material and the aluminum alloy wrought material by arc welding using the above-mentioned shielding gas. [Brief explanation of the drawings]

[0009] [Figure 1A] Fig. 1A is a process diagram illustrating the method for producing an aluminum alloy joined body according to the present disclosure. Fig. 1A shows the first step. [Figure 1B] 1B is a process diagram illustrating the method for producing an aluminum alloy joined body according to the present disclosure, showing the second step in which a molten pool is formed. [Figure 1C] Fig. 1C is a process diagram illustrating the method for producing an aluminum alloy joined body according to the present disclosure, showing the second step in which a weld is formed. [Figure 2] Fig. 2 is a process diagram illustrating the method for producing an aluminum alloy joined body of the first modified example. Fig. 2 shows a shielding gas supply device including a first container and a second container. [Figure 3] FIG. 3 is a photograph of the welded portion of Sample 3 taken from the two second principal surfaces. [Figure 4] FIG. 4 is a photograph of the welded portion of Sample 1 taken from the two second principal surfaces. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Outline of the embodiment] The shielding gas disclosed herein is used for arc welding of aluminum alloy die-cast material and aluminum alloy wrought material. The shielding gas contains 5% to 20% by volume of helium, with the remainder of the helium in the shielding gas being argon.

[0011] During arc discharge, the electrical conductivity of helium is lower than that of argon. Therefore, by using a shielding gas containing 5% or more helium by volume, the base of the arc shielded by the shielding gas can be reliably constricted. This concentrates energy near the molten pool, increasing the temperature of the molten pool. As a result, a sufficient amount of aluminum alloy wrought material is melted. Note that arc welding that achieves a sufficient amount of melting of aluminum alloy wrought material also achieves a sufficient amount of melting of aluminum alloy die-cast material. Furthermore, by using a shielding gas containing 20% ​​or less helium by volume, excessive constriction of the arc is prevented. This reduces the generation of spatter.

[0012] The shielding gas may contain 15% or less by volume of helium. When the shielding gas contains 15% or less by volume of helium, the occurrence of spatter can be further suppressed.

[0013] The method for manufacturing an aluminum alloy joined body of the present disclosure includes a first step of arranging an aluminum alloy die-cast material and an aluminum alloy wrought material adjacent to each other, and a second step of arc welding the aluminum alloy die-cast material and the aluminum alloy wrought material together using the above-mentioned shielding gas. This manufacturing method can suppress the generation of spatter while achieving a sufficient amount of penetration of the aluminum alloy wrought material.

[0014] [Specific example of embodiment] The shielding gas is used in arc welding between aluminum alloy die-cast material and aluminum alloy wrought material.

[0015] [Aluminum alloy die-cast material] An aluminum alloy die-cast material is a casting (casting) made from a raw material aluminum alloy (base metal). Specifically, an aluminum alloy die-cast material is a molded product formed by injecting an aluminum alloy (base metal) into a mold at high speed and pressure. The composition of the base metal does not change substantially due to die-casting. Therefore, the aluminum alloy (base metal) before die-casting and the material constituting the aluminum alloy die-cast material after die-casting are substantially equivalent (identical). Hereinafter, the "material constituting the aluminum alloy die-cast material" may be simply referred to as the "first material." The first material contains aluminum as its main component. The first material contains aluminum as well as a secondary component. The secondary component may include at least one selected from the group consisting of silicon, copper, zinc, magnesium, and manganese. In other words, the first material contains at least one selected from the group consisting of silicon, copper, zinc, magnesium, and manganese, with the remainder consisting of aluminum and impurities (described below). Preferably, the secondary components include silicon and copper. In other words, the first material contains silicon and copper, with the remainder being aluminum and impurities (described later). A first material containing silicon and copper is called an Al-Si-Cu alloy. In the first material, for example, the silicon content is 7.5% to 12% by mass, and the copper content is 1.5% to 4.0% by mass. The total content of the minor components in the first material is 9% to 16% by mass. The minor component content is determined by the method described in JIS H5302 (2006).

[0016] The first material may further contain additives in addition to aluminum and the auxiliary components. The additives and the auxiliary components do not need to be clearly distinguished. The additives include at least one metal selected from the group consisting of iron, magnesium, manganese, nickel, zinc, titanium, tin, and lead. The first material preferably contains at least one metal selected from the group consisting of silicon, copper, iron, magnesium, manganese, nickel, zinc, titanium, tin, and lead in addition to aluminum. In the first material, the iron content is 1.3% by mass or less, the magnesium content is 0.3% by mass or less, the manganese content is 1.0% by mass or less, the nickel content is 0.5% by mass or less, the zinc content is 3.0% by mass or less, the titanium content is 0.3% by mass or less, the tin content is 0.2% by mass or less, and the lead content is 0.2% by mass or less. The total content of the additives in the first material is 11.1% by mass to 15.4% by mass. The content of additives can be determined by the method described in JIS H5302 (2006).

[0017] The balance of the first material is made of aluminum and impurities, preferably aluminum. The impurities are inevitably contained in the aluminum alloy die-cast material during the production of the aluminum alloy die-cast material.

[0018] Specifically, the aluminum alloy die-cast material is "aluminum alloy die-cast" as specified in JIS H5302 (2006). Examples of aluminum alloy die-cast materials include ACD1, ADC3, ACD5, ACD6, ADC10, ADC10Z, ADC12, ADC12Z, ADC14, AlSi9, AlSi12(Fe), AlSi10Mg(Fe), AlSi8Cu3, AlSi9Cu3(Fe), AlSi9Cu3(Fe)(Zn), AlSi11Cu2(Fe), AlSi11Cu3(Fe), AlSi12Cu1(Fe), AlSi17Cu4Mg, and AlMg9. From the viewpoint of improving mechanical properties, preferred examples of aluminum alloy die-cast materials include ADC10, ADC10Z, ADC12, and AC12Z. Mechanical properties include machinability. Machinability refers to the ease with which a material can be cut. When an aluminum alloy die-cast material is an "aluminum alloy die-cast" as specified in JIS H5302 (2006), the numerical values ​​specified in JIS H5302 (2006) are used as the content ratio of each component in the aluminum alloy die-cast material.

[0019] [Wrought aluminum alloy] A wrought aluminum alloy is a compact formed by wrought processing of the raw aluminum alloy (base metal). The wrought processing includes at least one of rolling, forging, extrusion, and drawing. When the wrought processing includes two or more of rolling, forging, extrusion, and drawing, the order of these processes is not limited. For example, when the wrought processing includes forging and extrusion, forging may be performed after extrusion. The wrought aluminum alloy is at least one of rolled aluminum alloy, extruded aluminum alloy, drawn aluminum alloy, and forged aluminum alloy. The composition of the base metal does not change substantially due to wrought processing. Therefore, the material constituting the wrought aluminum alloy (base metal) before wrought processing and the material constituting the wrought aluminum alloy after wrought processing are substantially equivalent (identical). The "material constituting the wrought aluminum alloy" is sometimes simply referred to as the second material. The second material contains aluminum as the main component. The second material contains a secondary component in addition to aluminum. The secondary component may be at least one selected from the group consisting of silicon, magnesium, and copper. In other words, the second material contains at least one selected from the group consisting of silicon, magnesium, and copper, with the remainder consisting of aluminum and impurities (described below). The secondary components preferably include silicon and magnesium. In other words, the second material contains silicon and magnesium, with the remainder consisting of aluminum and impurities. A second material containing silicon and magnesium is called an Al-Mg-Si alloy. The silicon content in the second material is 0.20% by mass to 0.80% by mass, and the copper content in the second material is 0.45% by mass to 1.20% by mass. The total content of the secondary components in the second material is 0.65% by mass to 2.00% by mass. The content of the secondary components is determined by the method described in JIS H4100 (2015).

[0020] The second material may contain additives in addition to aluminum and auxiliary components. The additives and auxiliary components do not need to be clearly distinguished. The additives include at least one metal selected from the group consisting of iron, copper, manganese, chromium, zinc, and titanium. The second material preferably contains silicon, magnesium, iron, copper, manganese, chromium, zinc, and titanium in addition to aluminum. In the second material, the iron content is 0.70% by mass or less, the copper content is 0.40% by mass or less, the manganese content is 0.15% by mass or less, the chromium content is 0.35% by mass or less, the zinc content is 0.25% by mass or less, and the titanium content is 0.15% by mass or less. The total content of the additives in the second material is 0.1% by mass to 0.5% by mass. The additive content is determined by the method described in JIS H4100 (2015).

[0021] The balance of the second material is aluminum and impurities, preferably aluminum. The impurities are inevitably contained in the wrought aluminum alloy during production. The total content of the impurities in the second material is 0.25 mass% or less.

[0022] Specific examples of the second material include aluminum alloys in the A2000 series, A3000 series, A5000 series, A6000 series, and A7000 series specified in JIS H4100 (2015). From the viewpoint of improving mechanical strength, the A6000 series aluminum alloy is a preferred example of the wrought material material. "A6000 series aluminum alloy" is a general term for aluminum alloys assigned alloy numbers A6000 to A6999 in JIS H4100 (2015). Aluminum alloys other than the A6000 series are defined in the same way as the A6000 series aluminum alloy. Examples of A6000 series aluminum alloys include A6101, A6005A, A6005C, A6060, A6061, A6063, A6463, and A6082.

[0023] <Helium content in shielding gas> The shielding gas contains 5% by volume or more and 20% by volume or less of helium. The lower limit of the helium content in the shielding gas is preferably 8% by volume, more preferably 10% by volume, and even more preferably 12% by volume. If the helium content in the shielding gas is equal to or greater than the above-mentioned lower limit, the amount of penetration of the wrought aluminum alloy material can be further prevented from becoming insufficient. The upper limit of the helium content in the shielding gas is preferably 18% by volume, more preferably 15% by volume, and even more preferably 13% by volume. If the helium content in the shielding gas is equal to or less than the above-mentioned upper limit, the generation of spatter during arc welding can be further suppressed. The helium content in the shielding gas is determined using a thermal conductivity detector (TCD). If the shielding gas is commercially available, the value listed in the test report (or catalog) of the commercially available product can be used as the helium content.

[0024] The remainder of the helium in the shielding gas is argon. Specifically, the argon content in the shielding gas is, for example, 80% by volume or more, preferably 82% by volume or more, more preferably 85% by volume or more, and even more preferably 87% by volume or more, and for example, 95% by volume or less, preferably 92% by volume or less, more preferably 90% by volume or less, and even more preferably 88% by volume. In addition to helium and argon, the shielding gas may further contain impurities that are inevitably contained in the production of the shielding gas. Examples of impurities include nitrogen and oxygen. The impurity content in the shielding gas is 0.01% by volume or less. The respective content ratios of argon and impurities in the shielding gas are determined using a thermal conductivity detector.

[0025] [Method of manufacturing aluminum alloy joined body] FIG. 1A is a process diagram illustrating a method for manufacturing an aluminum alloy joined body according to the present disclosure. FIG. 1A shows a first step. FIG. 1B is a process diagram illustrating a method for manufacturing an aluminum alloy joined body according to the present disclosure. FIG. 1B shows a second step in which a molten pool is formed. FIG. 1C is a process diagram illustrating a method for manufacturing an aluminum alloy joined body according to the present disclosure. FIG. 1C shows a second step in which a weld is formed. The method for manufacturing an aluminum alloy joined body will be described with reference to FIGS. 1A to 1C.

[0026] The method for manufacturing an aluminum alloy joined body includes a preparation step, a first step, and a second step.

[0027] As shown in FIG. 1A , in the preparation step, an aluminum alloy die-cast material 1 and an aluminum alloy wrought material 2 are prepared. In this embodiment, the aluminum alloy die-cast material 1 has a flat plate shape. The aluminum alloy die-cast material 1 has a first main surface 11, a second main surface 12, and a side surface 13. The second main surface 12 is located away from the first main surface 11 in the thickness direction TD. The side surface 13 is located at the outer edge of the aluminum alloy die-cast material 1 when viewed in the thickness direction TD. The side surface 13 connects the first main surface 11 and the second main surface 12 in the thickness direction TD.

[0028] The wrought aluminum alloy material 2 has a flat plate shape. The wrought aluminum alloy material 2 has a first main surface 21, a second main surface 22, and a side surface 23. The second main surface 22 is located away from the second main surface 22 in the thickness direction TD. The side surface 23 is located at the outer edge of the wrought aluminum alloy material 2 when viewed in the thickness direction TD. The side surface 23 connects the first main surface 21 and the second main surface 22 in the thickness direction TD.

[0029] [1st step] In the first step after the preparation step, the aluminum alloy die-cast material 1 and the aluminum alloy wrought material 2 are arranged adjacent to each other. In the first step, the side surface 13 of the aluminum alloy die-cast material 1 prepared in the preparation step and the side surface 23 of the aluminum alloy wrought material 2 are made to face each other. In this embodiment, the side surface 13 is made to face the side surface 23 so that a gap 14 is formed between them. The gap 14 in the direction in which the side surfaces 13 and 23 face each other is 0.1 mm or less. Note that part or all of the side surface 13 may be in contact with the side surface 23. The second main surface 12 and the second main surface 22 are flush with each other. The first main surface 11 and the first main surface 21 are flush with each other.

[0030] [Second process] As shown in Fig. 1B, in the second step, an aluminum alloy die-cast material 1 and an aluminum alloy wrought material 2 are welded by arc welding using a shielding gas. In the second step, an arc welding device 3 and a shielding gas supply device 4 are used. The arc welding device 3 in this embodiment is of a consumable electrode type. The arc welding device 3 includes a torch 31, a wire feed unit 32, and a power source 33.

[0031] The torch 31 includes a torch body 311 and a contact tip 312. The torch body 311 has a first wall 3111 and a second wall 3112. The first wall 3111 has a cylindrical shape. The axis of the first wall 3111 is along the first direction D1. The first wall 3111 has an inner circumferential surface 3110. The first wall 3111 also has a first opening 3113 and a second opening 3114. The first opening 3113 is defined by a first end of the first wall 3111. The second opening 3114 is located in an intermediate portion of the first wall 3111 in the first direction D1. The second opening 3114 is formed in the inner circumferential surface 3110. The second wall 3112 is located at a second end of the first wall 3111. The second wall 3112 closes a second end of the first wall 3111. The second end is located away from the first end in the first direction D1.

[0032] The contact tip 312 is disposed inside the torch body 311. The contact tip 312 has a cylindrical shape. The contact tip 312 is aligned along the first direction D1. The contact tip 312 has a radial length that is shorter than that of the torch body 311. The contact tip 312 has an outer peripheral surface 3121 and an inner peripheral surface 3122. The outer peripheral surface 3121 is positioned radially apart from the inner peripheral surface 3110 of the torch body 311.

[0033] The wire feed unit 32 is capable of feeding the welding wire 5 toward the first opening 3113 of the torch 31. The wire feed unit 32 is disposed upstream of the contact tip 312 in the feeding direction of the welding wire 5. The wire feed unit 32 is located on the opposite side of the contact tip 312 from the second wall 3112.

[0034] The power supply 33 includes a power supply main body 330, a first terminal 331, and a second terminal 332. The power supply main body 330 is of a direct current or alternating current type. The first terminal 331 and the second terminal 332 are each made of a conductive material. The first terminal 331 is electrically connectable to the welding wire 5. The second terminal 332 is electrically connectable to at least one of the aluminum alloy die-cast material 1 (solid line) and the aluminum alloy wrought material 2 (phantom line).

[0035] The shielding gas supply device 4 is capable of supplying the above-described shielding gas to the second opening 3114. For example, the shielding gas supply device 4 includes a line 41 and a first container 42. The first container 42 contains the above-described shielding gas. Specifically, the first container 42 contains a shielding gas containing helium at the above-described content ratio. The first container 42 is connected to the second opening 3114 via the line 41. The shielding gas supply device 4 is provided separately from the arc welding apparatus 3. Although not shown, the shielding gas supply device 4 may be provided within the arc welding apparatus 3.

[0036] To perform the second step, welding wire 5 as a filler material is set in torch 31 and wire feed unit 32. Welding wire 5 has a circular shape in a cross section along a direction perpendicular to the direction in which welding wire 5 extends. Welding wire 5 has an outer circumferential surface 51. Outer circumferential surface 51 contacts inner circumferential surface 3122. Tip 52 of welding wire 5 is positioned outside first opening 3113 of torch 31 in the direction in which welding wire 5 extends. Examples of materials for welding wire 5 include aluminum alloys.

[0037] The material of the welding wire 5 is preferably an aluminum alloy containing aluminum and copper (Al-Cu alloy). The material of the welding wire 5 is more preferably an aluminum alloy containing aluminum, copper, silicon, iron, manganese, magnesium, zinc, and titanium (Al-Cu alloy). The aluminum alloy contains 0.3 mass% or less of copper, 4.5 to 6 mass% of silicon, 0.8 mass% or less of iron, 0.05 mass% or less of manganese, 0.5 mass% or less of magnesium, 0.1 mass% or less of zinc, and 0.2 mass% or less of titanium. The balance of the aluminum alloy contains aluminum. The content of each component in the aluminum alloy is determined by the method described in JIS Z3232 (2009) or ISO 18273 (2015). Aluminum alloys include the 4000 series standardized by JIS Z3232 (2009) and the 4000 series standardized by ISO 18273 (2015).

[0038] Shielding gas is supplied from shielding gas supply device 4 to second opening 3114. Then, the shielding gas flows between outer circumferential surface 3121 and inner circumferential surface 3110 and is discharged from first opening 3113. Specifically, the shielding gas is discharged from first opening 3113 toward gap 14.

[0039] The first terminal 331 is electrically connected to the welding wire 5. The welding wire 5 is a consumable electrode. The second terminal 332 is electrically connected to at least one of the aluminum alloy die-cast material 1 and the aluminum alloy wrought material 2. A voltage is applied between the welding wire 5 and at least one of the aluminum alloy die-cast material 1 and the aluminum alloy wrought material 2. Then, an arc 6 is formed between the welding wire 5 and at least one of the aluminum alloy die-cast material 1 and the aluminum alloy wrought material 2. The arc 6 is shielded from the surrounding atmosphere by a shielding gas discharged from the first opening 3113. Heat generated in the arc 6 melts (dissolves) the first main surface 11 and the first main surface 21 facing the arc 6. This forms a molten pool 61. Next, the tip 52 of the welding wire 5 melts. Liquid droplets produced by the melting of the welding wire 5 transfer to the molten pool 61.

[0040] Next, as the formation region of the molten pool 61 is moved, the previously formed molten pool 61 solidifies. Specifically, the torch 31 is moved relative to the aluminum alloy die-cast material 1 and the wrought aluminum alloy material 2 along the direction in which the weld 62 extends (the depth direction of the paper in FIG. 1B ). As a result, the region in which the molten pool 61 is formed moves sequentially, and the previously formed molten pool 61 cools and solidifies, forming the weld 62 as shown in FIG. 1C . The weld 62 connects the first main surface 11, the first main surface 21, the second main surface 12, and the second main surface 22. When the weld 62 is formed along the region to be welded, the welding of the aluminum alloy die-cast material 1 and the wrought aluminum alloy material 2 is completed. In this way, an aluminum alloy joined body 65 is produced, which includes the aluminum alloy die-cast material 1, the wrought aluminum alloy material 2, and the weld 62. In the arc welding, a short arc MIG welding method is performed, and some of the droplets are spray transferred (in other words, some of the solution is spray transferred, that is, the solution is partially spray transferred).

[0041] [First Modification] FIG. 2 is a process diagram illustrating a manufacturing method of an aluminum alloy joined body according to a first modification. FIG. 2 shows a shielding gas supply apparatus including a first container and a second container. The manufacturing method of an aluminum alloy joined body according to the first modification will be described using FIG. 2. The shielding gas supply apparatus 4 includes a first container 42, a second container 43, and a mixing section 44. The first container 42 contains only argon. The second container 43 contains only helium. The mixing section 44 is connected to the first container 42 via a flow control valve 421. The mixing section 44 is connected to the second container 43 via a second flow control valve 431. In the mixing section 44, argon supplied from the first container 42 and helium supplied from the second container 43 are mixed at the above-mentioned content ratio. The mixing section 44 contains a shielding gas containing helium at the above-mentioned content ratio. The mixing section 44 is connected to the second opening 3114 via a line 41.

[0042] [Other variations] The arc welding of this embodiment can be applied to laser-arc hybrid welding. In laser-arc hybrid welding, for example, arc welding and laser welding are performed in this order. First, the first main surface 11 and the first main surface 21 are heated using arc welding to form a molten pool 61, and then the molten pool 61 is pushed toward the second main surface 12 and the second main surface 22 by laser energy from laser welding, thereby increasing the amount of penetration. Note that in laser-arc hybrid welding, laser welding and arc welding may be performed in this order. When laser welding and arc welding are performed in this order, a blue or green laser is used for the laser welding. [Example]

[0043] According to the above-described manufacturing method, aluminum alloy die-cast material 1 and aluminum alloy wrought material 2 were welded by arc welding to manufacture aluminum alloy joined bodies 65, Samples 1 to 7, respectively. The shielding gas composition was as shown in Table 1. The helium and argon contents in the shielding gas were determined using a thermal conductivity detector. The shielding gases shown in Table 1 were used in the arc welding. Samples 2 to 6 are examples of the present disclosure. Samples 1 and 7 are comparative examples of the present disclosure. Details of the aluminum alloy die-cast material 1, the aluminum alloy wrought material 2, the welding wire 5, and the arc welding conditions are described below.

[0044] [Details of Aluminum Alloy Die Casting Material 1] ADC12 (Al-Si-Cu alloy) specified in JIS H5302 (2006) Thickness 5mm Silicon 9.6% by mass ~ 12% by mass Copper 1.5% by mass ~ 3.5% by mass Iron 1.3% by mass or less Manganese 0.5% by mass or less Magnesium 0.3% by mass or less Nickel: 0.5% by mass or less Zinc 1.0% by mass or less Titanium 0.3% by mass or less Tin 0.2% by mass or less Lead 0.2% by mass or less Aluminum Remainder

[0045] [Details of Aluminum Alloy Wrought Material 2] A6063 (Al-Mg-Si alloy) standardized by JIS H4100 (2015) Thickness 5mm Silicon 0.20% by mass ~ 0.60% by mass Magnesium 0.45% to 0.9% by mass Iron: 0.35% by mass or less Copper 0.10% by mass or less Manganese 0.10% by mass or less Chromium 0.10% by mass or less Zinc: 0.10% by mass or less Titanium 0.10% by mass or less Total impurities: 0.15% by mass or less Aluminum Remainder

[0046] [Details of welding wire 5] A4043, diameter 1.2mm, as specified in JIS Z3232 (2009) Al4943, diameter 1.2 mm, standardized by ISO 18273 (2015)

[0047] [Arc welding conditions] Arc welding device 3, model number W350, manufactured by Daihen Corporation Current 220A Voltage 25V Welding mode: Short circuit Welding speed: 100cm / min

[0048] [evaluation] Each sample was evaluated for the following items, and the results are shown in Table 1. [Amount of penetration of aluminum alloy die-cast material 1 and aluminum alloy wrought material 2] The welded portion 62 was visually observed from the side of the second main surface 12 and the side of the second main surface 22. The penetration amount of the aluminum alloy die-cast material 1 and the aluminum alloy wrought material 2 in each sample was evaluated according to the following criteria.

[0049] A Penetration was observed in both the die-cast aluminum alloy and the wrought aluminum alloy (see Figure 4). B. Penetration was observed in both the die-cast aluminum alloy and the wrought aluminum alloy. However, there were a few areas without penetration in the wrought aluminum alloy. C. Penetration was observed in the die-cast aluminum alloy material. However, in the wrought aluminum alloy material, many areas without penetration were observed (see Figure 4). In other words, no weld was formed.

[0050] Fig. 4 is a photograph of the welded portion of Sample 3 taken from the two second principal surface sides. Fig. 4 is a photograph of the welded portion of Sample 1 taken from the two second principal surface sides.

[0051] [Spatter] The occurrence of spatters in each sample was evaluated according to the following criteria: The number of spatters was counted by listening to the spatter sounds with the human ear.

[0052] A Even after welding for 60 seconds, there was no spatter. B When welding for 20 seconds, the number of spatters was between 1 and 9. C When welding for 20 seconds, the number of spatters was between 10 and 100.

[0053] [Table 1]

[0054] It should be understood that the embodiments and examples disclosed herein are illustrative in all respects and are not limiting in any respect. The scope of the present invention is defined not by the above description but by the claims, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0055] 1 aluminum alloy die-cast material, 2 aluminum alloy wrought material, 3 arc welding equipment, 4 shielding gas supply device, 5 welding wire, 6 arc, 7 sample, 11 first main surface, 12 second main surface, 13 side surface, 14 gap, 21 first main surface, 22 second main surface, 23 side surface, 31 torch, 32 wire feed section, 33 power source, 41 line, 42 first container, 43 second container, 44 mixing section, 51 outer surface, 52 tip, 61 molten pool, 62 welded portion, 65 aluminum alloy joint, 311 torch body, 312 contact tip, 330 power source body, 331 first terminal, 332 second terminal, 421 flow rate adjustment valve, 431 second flow rate adjustment valve, 3110 inner surface, 3111 first wall, 3112 second wall, 3113 First opening, 3114 second opening, 3121 outer peripheral surface, 3122 inner peripheral surface, D1 first direction, TD thickness direction.

Claims

1. A shielding gas used in arc welding of an aluminum alloy die-cast material and an aluminum alloy wrought material, A shielding gas containing 5% to 20% by volume of helium, the remainder being argon.

2. 2. The shielding gas according to claim 1, wherein the helium content is 15% by volume or less.

3. a first step of arranging an aluminum alloy die-cast material and an aluminum alloy wrought material adjacent to each other; a second step of welding the aluminum alloy die-cast material and the aluminum alloy wrought material by arc welding using the shielding gas according to claim 1 or 2; A method for manufacturing an aluminum alloy joined body, comprising:

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