Burner, and heating torch and gas pressure contact construction method using the same

Abstract

To provide a burner which can suppress oxidation on a pressure contact surface using standard flame from initial heating, without a reduction material, when a pressure contact material is pressure-contacted.SOLUTION: A burner A1 includes: a burner base 10 having a flame hole 180 provided at its tip; and a gas inductor 4 which is stored in the flame hole 10, is rotatable in its circumferential direction and fixable at a predetermined position, divides a gas flow passing through the flame hole 180 into two ways, prevents flame from being brought into direct contact with a pressure contact surface 500 of a pressure contact material, and forms a region to enable heating enough to pressure contact in the vicinity of the pressure contact surface 500 with a predetermined width.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a flame nozzle, a heating torch using the same, and a gas pressure welding method. More specifically, it relates to a method for welding reinforcing bars and other pressure-welding materials by preventing the flame from directly hitting the pressure-welding surfaces of the materials, by forming an area near the pressure-welding surfaces that is heated sufficiently to enable pressure welding, and by appropriately adjusting the width of the area in the direction sandwiching the pressure-welding surfaces. [Background technology]

[0002] For example, in gas pressure welding of rebars using acetylene gas, the weld surfaces of the rebars must be polished and the initial heating must be done with a reducing flame until the tip surfaces come into close contact. If the initial heating is done with a standard flame (neutral or oxidizing flame), an oxide film will form on the weld surfaces, resulting in poor bonding and fracture of the weld surfaces.

[0003] On the other hand, the use of natural gas and propane gas, which have lower heat output than acetylene gas but are easier to handle and have a smaller environmental impact, has long been a concern. In other words, when attempting to use these gases for pressure welding, in order to achieve the same heat output as acetylene gas, heating must be done with a standard flame from the initial heating stage, and in this case, measures must be taken to prevent the formation of an oxide film on the pressure welding surface.

[0004] One solution to this problem is the gas pressure welding method, which uses a cap-shaped PS ring containing a polystyrene sheet and a steel ring as a reducing agent (or antioxidant) when pressure welding rebars, etc. However, the use of a reducing agent in pressure welding has the problem of being costly. Also, since the reducing agent is sandwiched between the pressure welding surfaces of rebars, etc., heating efficiency tends to be poor, which can lead to the problem of an oxide film easily forming on the pressure welding surfaces.

[0005] Furthermore, even when a standard flame is used, these problems can be improved if, for example, the flame is not applied directly to the pressure welding surfaces and the vicinity of the pressure welding surfaces is heated sufficiently to enable pressure welding.In the field of gas welding rather than gas pressure welding, a technology for a similar purpose, i.e., a technology for preventing atmospheric oxygen from being taken into the welded parts during gas welding, is disclosed in Patent Document 1, "Gas Welding Method and Apparatus." [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 9-220662 Summary of the Invention [Problem to be solved by the invention]

[0007] In the conventional welding method and apparatus described above, mixed gas is sprayed simultaneously from mixed gas nozzles on both sides of the welded portion of the workpiece. Each mixed gas nozzle is drilled at a predetermined inclination angle at the tip of the nozzle, so the inclination angle is fixed. Therefore, it is not possible to adjust the range in which the flame does not directly hit the welded portion.

[0008] On the other hand, in gas pressure welding, in recent years, materials such as rebars have become stronger, and the amount of heat input to the vicinity of the welded surface during gas pressure welding is becoming increasingly important. If this heat input is insufficient, a flat fracture (a fracture with a large amount of oxide) will occur at the welded surface, raising concerns that the strength of the welded joint will not be ensured.

[0009] One way to address this issue is to narrow the area that is heated enough to allow pressure welding without directly applying the flame to the weld surfaces, thereby concentrating the heat near the weld surfaces, thereby increasing the amount of heat input to the area near the weld surfaces. However, as mentioned above, the conventional methods and devices were unable to adjust the area in this way.

[0010] The present invention was devised in consideration of the above points, and aims to provide a nozzle that, when pressure welding pressure materials such as rebar, does not directly apply a flame to the pressure welding surface of the pressure welding material, forms an area in the vicinity of the pressure welding surface that is sufficiently heated to enable pressure welding, and can appropriately adjust the width of that area in the direction of sandwiching the pressure welding surface, as well as a heating torch and gas pressure welding method that use the nozzle. [Means for solving the problem]

[0011] [1] In order to achieve the above object, the present invention provides a nozzle comprising a nozzle base having a fire hole at its tip, and a gas guide located inside the nozzle base, configured to be rotatable in the circumferential direction relative to the nozzle base and fixable at a predetermined position, which divides the gas flow passing through the fire hole, prevents the flame from directly hitting the press-fit surface of the press-fit material, and forms an area in which the vicinity of the press-fit surface is heated sufficiently to enable press-fitting.

[0012] [2] In the burner of the present invention, in [1], the width of the region can be changed by rotating the gas guide in the circumferential direction of the burner base.

[0013] The burner of the present invention is provided with a gas conductor separate from the burner base, so that even if a malfunction occurs in the gas conductor's function of dividing the gas flow passing through the burner hole, for example due to deterioration over time, the gas conductor can be replaced and the malfunction can be easily resolved.

[0014] The gas guide divides the gas flow, which also divides the flames used to heat the pressure welding material. Since the divided flames are not directly applied to the pressure welding surfaces of the pressure welding material, the formation of an oxide film on the pressure welding surfaces can be suppressed. Furthermore, the heating near the pressure welding surfaces can be sufficiently performed to form an area where pressure welding is possible.

[0015] Even if a standard flame is used from the initial heating stage, gas pressure welding can be performed while preventing the formation of an oxide film on the welding surface, making it possible to perform gas pressure welding using flammable gases such as natural gas or propane gas, which are readily available and have a low environmental impact. The use of a reducing agent in combination with the gas can further prevent oxidation.

[0016] Furthermore, the gas conductor is located inside the nozzle base and is configured to be rotatable in the circumferential direction relative to the nozzle base and to be fixed at a predetermined position, so that the position of the gas flow can be rotated by the amount of circumferential rotation, changing the position of the flame and appropriately adjusting the width of the above-mentioned region in the direction sandwiching the pressure contact surface.

[0017] This allows the width of the above-mentioned region to be narrowed as needed to increase the amount of heat input near the pressure welding surface during gas pressure welding, thereby preventing the occurrence of flat fractures on the pressure welding surface, making it possible to perform gas pressure welding that is suited to the thickness and material of the pressure welding material.

[0018] [3] In the burner of the present invention, in [1] and [2], the gas guide may be provided with a branching ejection path having a plurality of ejection ports formed therein for dividing the gas flow passing through the burner hole.

[0019] In this case, the diverted flow jet passage is formed with multiple jet ports that divide the gas flow passing through the fire hole, so that the gas flow is divided and sent from each jet port toward the fire hole. Also, because the gas flow is guided by the diverted flow jet passage before it is ejected from each jet port, each flame is stable, and the specified heating of the pressure welding material can be performed stably and efficiently.

[0020] [4] In the fire nozzle of the present invention, in [1] and [2], the gas conductor may have a hole formed in its longitudinal direction, and may have a diverting member that is arranged to cross the hole in the approximately diametric direction and divides the gas flow passing through the fire hole.

[0021] In this case, a hole is formed in the longitudinal direction of the gas guide, and a flow dividing member is provided so as to cross the hole in a substantially diametrical direction, so that the gas flow passing through the fire hole can be divided by the flow dividing member. Also, in order to divide the gas flow, a configuration is adopted in which a flow dividing member crosses the hole in a substantially diametrical direction, which has the advantage that the flame can be divided with a simple configuration.

[0022] [5] In order to achieve the above object, the present invention provides a heating torch comprising: a burner tube; a nozzle base attached to the burner tube and having a fire hole at its tip; and a nozzle located inside the nozzle base, configured to be rotatable in the circumferential direction relative to the nozzle base and fixable at a predetermined position, the nozzle having a gas guide that divides the gas flow passing through the fire hole, prevents the flame from directly hitting the press-fit surface of the press-fit material, and forms an area in the vicinity of the press-fit surface where heating is sufficient to enable press-fitting.

[0023] The heating torch of the present invention divides the gas flow using a nozzle attached to the burner tube, thereby dividing the flame when heating the pressure-welding material. The nozzle rotates the gas guide around the circumferential direction of the nozzle base and fixes it in place, preventing the flame from directly hitting the pressure-welding surface of the pressure-welding material, and creating an area near the pressure-welding surface that is sufficiently heated to enable pressure welding.

[0024] By overlapping (aligning) this area with the pressure welding surface, it is possible to apply the required heat for pressure welding of the welding material. This makes it possible to prevent the formation of an oxide film on the pressure welding surface even when using a standard flame from the initial heating stage.

[0025] Furthermore, the nozzle of the heating torch is configured so that the gas guide can be rotated in a circumferential direction relative to the nozzle base and can be fixed at a predetermined position, so that the position of the gas flow can be rotated by the amount of circumferential rotation, changing the position of the flame and appropriately adjusting the width of the above-mentioned area in the direction sandwiching the pressure contact surface.

[0026] This allows the width of the above-mentioned region to be narrowed as needed to increase the amount of heat input near the pressure welding surface during gas pressure welding, thereby preventing the occurrence of flat fractures on the pressure welding surface, making it possible to perform gas pressure welding that is suited to the thickness and material of the pressure welding material.

[0027] [6] In order to achieve the above object, the present invention provides a gas pressure welding method that uses a heating torch having a nozzle attached to a burner tube, the nozzle having a nozzle base with a nozzle hole at the tip and a gas inductor inside the nozzle base that divides the gas flow passing through the nozzle hole, and rotates the gas inductor in the circumferential direction of the nozzle base to prevent the flame from directly hitting the pressure welding surface of the pressure welding material, and adjusts the width of the area that has been heated sufficiently near the pressure welding surface to enable pressure welding, and heats the area so that it overlaps the pressure welding surface of the pressure welding material.

[0028] In the gas pressure welding method of the present invention, the nozzle attached to the heating torch divides the gas flow, and the flame used to heat the pressure welding material is also divided. The nozzle rotates the gas guide around the circumferential direction of the nozzle base and is fixed in place, preventing the flame from directly hitting the pressure welding surface of the pressure welding material, and creating an area near the pressure welding surface that is sufficiently heated to enable pressure welding.

[0029] By overlapping (aligning) this area with the pressure welding surface, it is possible to apply the required heat for pressure welding of the welding material. This makes it possible to prevent the formation of an oxide film on the pressure welding surface even when using a standard flame from the initial heating stage.

[0030] In addition, in the gas pressure welding method of the present invention, the nozzle of the heating torch rotates the gas inductor in the circumferential direction of the nozzle base, thereby preventing the flame from directly hitting the pressure welding surface of the pressure welding material, and making it possible to adjust the width of the area in which the heating near the pressure welding surface is sufficient to enable pressure welding.

[0031] This allows the width of the above-mentioned region to be narrowed as needed to increase the amount of heat input near the pressure welding surface during gas pressure welding, thereby preventing the occurrence of flat fractures on the pressure welding surface, making it possible to perform gas pressure welding that is suited to the thickness and material of the pressure welding material.

[0032] [7] In the gas pressure welding method of the present invention, in [6], the heating can also be performed using a standard flame.

[0033] In this case, heating is performed using a standard flame, so natural gases other than acetylene gas, such as propane gas, can be used to suppress the formation of an oxide film on the pressure welding surface, while obtaining sufficient heat for the pressure welding method and allowing the pressure welding of the pressure welding material to be performed. [Effects of the Invention]

[0034] The present invention provides a nozzle that, when pressure welding pressure materials such as rebar, prevents the flame from directly hitting the pressure welding surface of the pressure welding material, forms an area in the vicinity of the pressure welding surface that is sufficiently heated to enable pressure welding, and can appropriately adjust the width of that area in the direction sandwiching the pressure welding surface, as well as a heating torch and gas pressure welding method that use the nozzle. [Brief explanation of the drawings]

[0035] [Figure 1] FIG. 1 is an exploded perspective view showing the structure of a first nozzle of the present invention. [Figure 2] FIG. 2 is a vertical cross-sectional view of the first burner nozzle shown in FIG. 1 in an assembled state. [Figure 3] FIG. 10 is an explanatory diagram showing another example of the gas director of the first nozzle. [Figure 4] FIG. 10 is an explanatory diagram showing the structure of a second nozzle of the present invention. [Figure 5] FIG. 10 is an exploded perspective view showing the structure of a third nozzle of the present invention. [Figure 6] FIG. 6 is a vertical cross-sectional view of the assembled third nozzle shown in FIG. 5. [Figure 7] 1 is a schematic explanatory diagram of a heating torch of the present invention. [Figure 8]FIG. 10 is an explanatory diagram showing the change in the position of the nozzle due to the rotation of the gas director of the first crater. [Figure 9] FIG. 10 is an explanatory diagram showing the state of heating by a heating torch in which the gas inductor of the first nozzle is rotated and adjusted to maximize the area that is heated sufficiently to enable pressure welding. [Figure 10] FIG. 10 is an explanatory diagram showing a state of heating by a heating torch in which the gas inductor of the first nozzle is rotated and adjusted to narrow the area that is heated sufficiently to enable pressure welding. DETAILED DESCRIPTION OF THE INVENTION

[0036] The embodiment of the present invention will be described in more detail with reference to FIGS. First, the structure of a first burner A1 (hereinafter simply referred to as the burner A1) according to the present invention will be described with reference to FIGS.

[0037] The burner A1 is made of metal (for example, brass), but is not limited to this and may be made of other metal materials such as titanium, which has better fire resistance. The same applies to the burners A2 and A3 described below.

[0038] The nozzle A1 has a nozzle base 10. The nozzle base 10 is a hollow body having a space 100 penetrating through its center in the longitudinal direction (vertical direction in Fig. 2). The nozzle base 10 has, in order from the base end side (lower end side in Fig. 2), a base screw pipe section 11, a flange section 12, and a tip pipe section 18 whose outer shape is approximately a hexagonal pillar.

[0039] The base screw pipe 11 has a male thread (reference numeral omitted) on its outer periphery for screwing into a mounting pipe 94 of the heating torch 9, which will be described later. The inner periphery of the part of the space 100 that corresponds to the base screw pipe 11 is a circular hole 16, and the inner periphery of the part that connects to the circular hole 16 and corresponds to the flange part 12 is a receiving hole 16a that narrows upward so as to form a frusto-conical space (see FIG. 2).

[0040] Within space 100, the space located beyond receiving hole 16a is circular hole 16b. Circular hole 16b penetrates the tip surface of tip tube portion 18, and its opening forms circular fire hole 180. A chamfered portion 181 is provided at the rim of fire hole 180 to prevent the spread of the flame that passes through it from being impeded. In addition, a screw hole 19 is provided in one location on the peripheral wall of tip tube portion 18, penetrating the peripheral wall. A set screw 190 is threaded into screw hole 19.

[0041] Furthermore, a gas conductor 4 is accommodated inside the space 100. The gas conductor 4 has, in order from the base end side, a rotating shaft portion 42 having a truncated conical outer shape, a neck portion 40 which forms a fire hole 180 and has a diameter smaller than that of the circular hole 16b, and a guide portion 41 which is approximately spur gear shaped.

[0042] The guide portion 41 has a plurality of teeth 410 in the circumferential direction, and a plurality of grooves 411 are formed between each tooth 410. The outer diameter of the guide portion 41 is slightly smaller than the inner diameter of the circular hole 16b in the space 100, and the gas guide 4 is rotatable in the circumferential direction and movable back and forth along the inner periphery that forms the receiving hole 16a and the circular hole 16b.

[0043] Incidentally, engaging recesses 44 for engaging a rotation operating tool such as a screwdriver are provided at two locations on the diameter line of the base end of the rotating shaft portion 42. Furthermore, when the rotating shaft portion 42 is housed in the receiving hole 16a, its position in the longitudinal direction of the burner base 10 is determined with the entire surfaces of the two portions in contact with each other, and the angle in the circumferential direction can be adjusted by sliding and rotating, and it is fixed at that adjusted position by tightening the setscrew 190.

[0044] Furthermore, when the gas guide 4 is attached to the nozzle base 10 and integrated in this manner, a plurality of gas passages 400 (shown in Figure 2) are formed in the circumferential direction of the guide section 41 over the entire length of the guide section 41 in each groove 411 portion between the inner periphery of the circular hole 16a in the space 100 and the guide section 41.

[0045] A diversion jetting passage 45 is provided inside the gas guide 4 over its entire length. The diversion jetting passage 45 has an inlet 451 that narrows toward the front, and jetting passages 452, 452a whose base ends communicate with the inlet 451 and whose front ends penetrate the front end surface of the gas guide 4.

[0046] The ejection paths 452, 452a are provided by drilling (perforating) a straight circular hole so as to branch into two directions at a predetermined angle (180° in plan view) with respect to the central axis direction of the gas guide 4. This angle is set to 15° in this embodiment, but is not limited to this angle.

[0047] The tip ends of the ejection paths 452, 452a form ejection ports 450, 450a. The tip faces on which the ejection ports 450, 450a are provided are provided with two faces inclined at a predetermined angle with the top edge 453 as the boundary (see FIGS. 1 and 2). The ejection paths 452, 452a are formed at approximately right angles to these inclined faces (reference numerals omitted), which has the advantage that the ejection paths 452, 452a can be easily drilled during manufacturing.

[0048] The neck portion 40 has communication holes 43 that penetrate the peripheral wall at two locations in the diameter direction and lead from the ejection paths 452, 452a to the space 100. This allows the gas flow to flow from the ejection paths 452, 452a through the communication holes 43 and the space 100 and into each gas passage 400 when the gas guide 4 and the nozzle base 10 are integrated.

[0049] The gas conductor 4 is first placed entirely in the circular hole 16 of the nozzle base 10, the guide portion 41 is inserted into the circular hole 16b, and when the rotary shaft portion 42 comes into contact with the receiving hole 16a, it is rotated and adjusted, and as described above, it is fixed inside the nozzle base 10 with the set screw 190. In this state, the nozzles 450, 450a of the gas conductor 4 are positioned inward of the space 100 at a slight distance from the tip of the nozzle hole 180 (see Figure 2).

[0050] When the gas guide 4 is integrated with the nozzle base 10, it is fixed with a set screw 190, so that the angle at which the nozzles 450, 450a are arranged in the circumferential direction is adjusted to a predetermined angle.

[0051] As will be described later, when heating the press-contact surfaces 500 of the press-contact materials 51, 52, this angle can be freely adjusted with respect to the press-contact surfaces 500 of the press-contact materials 51, 52 when the nozzles 450, 450a are attached to the heating torch 9 and assembled. Note that the angle at which adjustment of the nozzle arrangement is effective is essentially between a perpendicular (90°) state and a parallel (0°) state with respect to the press-contact surfaces 500.

[0052] (Action of Crater A1) 1, 2, and 7 to 10, the operation of the nozzle A1 will be described together with the operation of the heating torch 9 incorporating it. Although the present embodiment will be described using the nozzle A1, it goes without saying that the nozzles A2 and A3 can be used to adjust the angle of the nozzle arrangement and perform pressure welding in a substantially similar manner.

[0053] First, the heating torch 9 according to the present invention will be outlined with reference to FIG. The heating torch 9 incorporating the nozzle A1 is a heating torch for gas pressure welding. The heating torch 9 has a gas inlet pipe for introducing combustible gas. A combustible gas supply pipe with a valve and an oxygen supply pipe (neither of which are shown) are connected to the base of the gas inlet pipe so that they can merge.

[0054] A U-shaped branch pipe 91 is connected to the tip of the gas inlet pipe, and burner pipes 92, which are branch horizontal pipes, are connected to both ends of the branch pipe 91 in opposing directions. The center lines of the gas inlet pipe, branch pipe 91, and each burner pipe 92 are on the same plane (normally on a horizontal plane when installed).

[0055] Each burner tube 92 has four nozzles A1 on the inside thereof, for a total of eight nozzles A1, which are attached by screwing the base screw pipe portion 11 into the threaded mounting pipe 94. In this embodiment, the number of nozzles is four for each burner tube, but is not limited to this.

[0056] The fire holes 180 of each nozzle A1 are oriented inward (toward the center on the same plane), i.e., toward the pressure contact materials 51, 52 arranged between each burner tube 92. The edge line of the top edge 453 of the tip of the gas guide 4 located near the fire holes 180 of each nozzle A1 is set to be approximately at the same height as and approximately parallel to the center line (reference numeral omitted) and the pressure contact surface 500 of each burner tube 92 (see FIG. 7).

[0057] In addition, above and below the nozzle A1 at the tip and base ends of each burner tube 92, nozzles A1a are attached at a slight angle above and below the horizontal, facing inward relative to the mounting tube 94 in the same way as the nozzle A1, to heat areas slightly above and below the pressure contact surfaces 500 of the pressure contact materials 51 and 52.

[0058] Each nozzle A1a has a structure similar to that of the nozzle A1, but the direction of the ejection paths 452, 452a is set to be approximately perpendicular to the direction of the nozzle A1, that is, parallel to the circumferential direction of the pressure welding material (see Figure 7). The nozzles A1a are attached to each burner tube 92 at eight locations, two on each side, above and below.

[0059] This allows combustible gas such as propane gas to be supplied from the combustible gas supply pipe and oxygen supply pipe to each of the nozzles A1 and A1a fixed to each mounting pipe 94. The combustible gas mixed with oxygen (hereinafter referred to as combustible gas) is introduced from the circular hole 16 of the nozzle base 10 and enters the branch jetting path 45 of the gas derivative 4.

[0060] The pressure of the combustible gas passing through the diverted jet passage 45 is maintained at a substantially constant high pressure, and part of the combustible gas passes through the diverted jet passage 45 and is ejected from the nozzles 450, 450a toward the fire hole 180 so as to spread at a predetermined angle. Another part of the combustible gas passes from the diverted jet passage 45 through the communication holes 43, enters the space 100, passes through the gas passages 400, and merges with the combustible gas ejected from the above-mentioned nozzles 450, 450a.

[0061] When the joined combustible gases are ignited, flames are ejected in two directions at a predetermined angle from the fire holes 180 of each nozzle A1 and each nozzle A1a. In this case, the angle at which the nozzles 450, 450a of each nozzle A1 are arranged (the angle of the top part 453) is a right angle (90°) with respect to the pressure contact surface 500.

[0062] In this state, the flames F1 and F2 that branch out in two directions from each nozzle A1 are not directly applied to the pressing surfaces 500 of the pressing materials 51 and 52, as shown in Figure 9, and form a region R1 of a predetermined width in the vicinity of the pressing surfaces 500 where the heating is sufficient to enable pressing (for convenience of illustration, only one nozzle A1 is shown in Figure 9).

[0063] For example, if the pressure-welding materials 51, 52 to be welded are thicker or stronger and a greater amount of heat input is required near the pressure-welding surface 500 during pressure welding, the width of region R1 in the direction sandwiching the pressure-welding surface 500 is adjusted to be narrower as follows.

[0064] That is, the gas conductor 4 is rotated to set the circumferential angle relative to the nozzle base 10 at an appropriate angle (for example, from an angle of 90° relative to the pressure contact surface 500 shown in FIG. 8(a) to an angle of 30° shown in FIG. 8(c)), and then fixed with the set screw 190 before supplying combustible gas to the heating torch 9. The gas conductor 4 can be rotated by using a dedicated rotation operating tool that is hooked onto the nozzles 450, 450a from the front side of the fire hole 180 with the set screw 190 loosened and rotated.

[0065] 10(a), when the gas guide 4 of the nozzle A1 is rotated 60° to the right, the angle of the nozzles 450, 450a becomes 30° with respect to the pressure-welding surface 500. In this state, the width of the region in the direction sandwiching the pressure-welding surface 500 becomes shorter, and the region where the flames F1, F2 are not directly applied to the pressure-welding surface 500 and the vicinity of the pressure-welding surface 500 is heated sufficiently to enable pressure welding becomes region R2, which is narrower than region R1.

[0066] According to this, although the amount of heat from the flames F1 and F2 emitted from each nozzle A1, which is at the same height as the center line of each burner tube 92, is constant, the area of ​​region R2 is smaller, so the amount of heat per unit area is larger, and the amount of heat input to a closer location in the vicinity of the pressure welding surface 500 can be increased.

[0067] In addition, each flame splitting into two directions from each nozzle A1a can heat a wide area around the axial direction of the pressure-welding materials 51, 52, which are separated by a predetermined distance above and below the pressure-welding surface 500, and therefore the pressure-welding materials 51, 52, including the pressure-welding surface 500, can be heated efficiently.

[0068] Furthermore, with the heating torch 9 incorporating the nozzles A1 and A1a, even if a standard flame using a flammable gas such as propane gas is used from the initial heating stage when pressure welding the pressure welding materials 51 and 52, the standard flame does not directly heat the pressure welding surfaces 500, thereby preventing the formation of an oxide film on the pressure welding surfaces 500. Furthermore, gas pressure welding of the pressure welding materials 51 and 52 becomes possible without using a reducing agent.

[0069] In this embodiment, the pressure welding materials 51 and 52 are supported in a vertical position, and each burner tube 92 of the heating torch 9 is positioned horizontally to perform gas pressure welding. However, this is not limited to this, and the pressure welding materials 51 and 52 can also be supported horizontally and each burner tube 92 of the heating torch 9 can be positioned vertically to perform the gas pressure welding.

[0070] 3 shows a gas conductor 4b, which is a modified example of the gas conductor 4. In the following description, parts of the structure of the gas conductor 4b that are common to the gas conductor 4 are denoted by the same reference numerals as those of the gas conductor 4, and the description thereof will be omitted.

[0071] The gas guide 4b is provided with a gear-shaped guide portion 41b. Unlike the teeth 410 of the guide portion 41, each tooth 410b of the guide portion 41b is inclined at a predetermined angle relative to the axial direction and has a spiral shape, with grooves 411b formed between them.

[0072] When the gas guide 4b is attached to the nozzle base 10 and integrated, a spiral gas passage (not shown) consisting of multiple grooves in the circumferential direction of the guide portion 41b is formed over the entire length of the guide portion 41b in each groove 411b portion between the inner periphery of the circular hole 16a and the guide portion 41b in the space 100.

[0073] During use, gas flows are ejected from the nozzles (not shown) of each gas passage at a predetermined angle relative to the axial direction of the gas guide 4b and are discharged in a swirling manner. This expands the area where the outer flame of the flame is formed, and this outer flame formation area serves to prevent oxygen from the atmosphere from being drawn into the inner flame, thereby preventing oxygen from the atmosphere from being drawn into the press-welding surfaces 500 of the press-welding materials 51, 52. This prevents the formation of an oxide film on the press-welding surfaces 500, ensuring good welding of the press-welding surfaces 500.

[0074] Next, the structure of the second nozzle A2 (hereinafter simply referred to as nozzle A2) according to the present invention will be described with reference to Fig. 4. The structure of the nozzle base 10 of the nozzle A2 is similar to that of the nozzle base 10 of the nozzle A1, so in the following description, the common parts are denoted by the same reference numerals as those of the nozzle base 10, and the description here will be omitted.

[0075] A gas guide 6 is accommodated in the space 100 of the nozzle base 10 of the nozzle A2 and is positioned at a predetermined height. The gas guide 6 has, from the base end side, a rotating shaft portion 62 with a truncated cone-shaped outer shape, a neck portion 60 with a smaller diameter than the circular hole 16b and forming the fire hole 180, and a guide portion 61 with a substantially spur gear shape. Two engagement recesses 64 are provided on the diameter line of the base end of the base screw tube portion 62 for engaging a rotation operating tool such as a screwdriver.

[0076] The guide portion 61 has a plurality of teeth 610 in the circumferential direction, and a plurality of grooves 611 are formed between each tooth 610. The outer diameter of the guide portion 61 is slightly smaller than the inner diameter of the circular hole 16b in the space 100, and the gas guide 6 is rotatable in the circumferential direction and movable back and forth along the inner periphery of the space 100.

[0077] Furthermore, when the gas guide 6 is attached to the nozzle base 10 and integrated, a plurality of gas passages 600 (shown in Figure 4) are formed in the space 100 between the inner periphery of the circular hole 16b and the guide portion 61 in the circumferential direction of the guide portion 61, extending over the entire length of the guide portion 61.

[0078] A diverted flow ejection passage 65 is provided inside the gas guide 6 over its entire length. The diverted flow ejection passage 65 has an inlet 651 that narrows toward the front, and a central ejection hole 653 that communicates with the inlet 651 at its base end and penetrates the front end surface of the gas guide 6 at its tip end.

[0079] The central injection hole 653 is an elliptical hole whose opening (reference numeral omitted) is slightly bulged in the diameter direction (see FIG. 4(b)). The tip end surface of the gas guide 6 is perpendicular to the axial direction of the guide portion 61 (see FIG. 4(a)).

[0080] The guide portion 61 has two parallel vertical grooves 66 formed in two locations in the diameter direction over approximately the entire length. Each vertical groove 66 is located at the position where the diameter of the central injection hole 653 is smallest, and is provided parallel to the axial direction of the guide portion 61. A plate-shaped divided member 67, which is made by bending a rectangular metal plate at the center, is attached and fixed to each vertical groove 66 over approximately the entire length.

[0081] The bottom of the vertical groove 66 is formed in a generally circular shape and is slightly wider, and the bent portion of the divided member 67 that has an increased diameter is inserted horizontally to prevent it from slipping out. Note that the fixing structure of the divided member 67 is not limited to this, and other structures may be used.

[0082] As a result, central jet hole 653 is divided roughly in half by dividing member 67, dividing the space into two and forming jet paths 652, 652a. The gas flow passes through jet paths 652, 652a and is jetted out from jet ports 650, 650a at the tip. This jetted gas flow spreads in two directions at a predetermined angle along the expansion of the inner surface of central jet hole 653, which has an elliptical mouth.

[0083] After the central injection hole 653 is separated and attached to the divided member 67, it can be expanded by drilling a hole from the upper surface of the middle part of the divided member 67. This allows the flame to spread more reliably and stabilize the flame.

[0084] The shape of the nozzles 650, 650a is not particularly limited and may be semi-elliptical, semi-circular, or other irregular shapes. This shape, including the shape of the nozzles 650, 650a, is not particularly limited as long as the flame spreads in two directions at a predetermined angle.

[0085] Furthermore, the neck portion 60 is provided with communication holes 63 that penetrate the peripheral wall at two locations in the diameter direction and lead from the central ejection hole 653 to the space 100. This allows the gas flow to flow from the central ejection hole 653 through each communication hole 63 and the space 100 and into each gas passage 600 when the gas guide 6 and the crater base 10 are integrated.

[0086] The mouth at the tip of the central injection hole 653 can also be formed to widen like a trumpet. When formed like a trumpet, the gas flow is divided along the surface of the widened mouth, so that the flame can be spread more reliably.

[0087] The gas conductor 6 is fixed inside the nozzle base 10 in the same manner as the gas conductor 4. In this state, the upper end of the gas conductor 6 is located inward of the space 100 at a slight distance from the tip of the fire hole 180 (see FIG. 4(a)).

[0088] When the gas guide 6 and the nozzle base 10 are integrated, the gas guide 6 is fastened with a set screw 190, and the arrangement of the ejection paths 652, 652a is adjusted to a predetermined angle in the circumferential direction of the nozzle base 10, thereby creating the nozzle A2.

[0089] Then, a heating torch (not shown) is made by incorporating nozzle A2 in the same manner as nozzle A1, and similarly to heating torch 9 incorporating nozzle A1, the flame ejected from nozzle 180 is prevented from directly hitting the pressing surface of the pressing material, and an area can be formed in which the heating near the pressing surface is sufficient to enable pressing.

[0090] Furthermore, as in the case of the nozzle A1, if necessary, the gas guide member 6 can be rotated to adjust the angle of the nozzles 650, 650a, and the width of this area in the direction sandwiching the pressure-welding surface can be narrowed, or other adjustments can be made to suit the characteristics of the pressure-welding material, thereby adjusting the amount of heat input near the pressure-welding surface.

[0091] Next, the structure of the third nozzle A3 (hereinafter simply referred to as nozzle A3) will be described with reference to Figures 5 and 6. The third nozzle A3 has a nozzle base 10a. The nozzle base 10a is a hollow body with a space 100a penetrating through its center in the longitudinal direction. The nozzle base 10a has, in order from the base end, a lower screw pipe portion 11a, a flange portion 12a, and an upper pipe portion 18a whose outer shape is approximately hexagonal prism-shaped.

[0092] The lower threaded pipe portion 11a has a male thread (reference numeral omitted) on its outer periphery. Furthermore, a threaded hole 17a is provided on the inner periphery of the space 100a at a portion that corresponds approximately to the lower threaded pipe portion 11a and the flange portion 12a (see FIG. 6).

[0093] Of space 100a, the space located above screw hole 17a penetrates the upper end surface of upper tube portion 18a, and its tip forms a circular fire hole 180. In addition, a screw hole 19 is provided in one location on the peripheral wall of upper tube portion 18a, penetrating the peripheral wall. A set screw 190 is threaded into screw hole 19.

[0094] A gas guide 4a is housed inside the space 100a and is attached at a predetermined position. The gas guide 4a is provided with, in order from the base end, a lower screw tube portion 42a having a male thread (reference numeral omitted) on the outer periphery, a neck portion 40a whose diameter is smaller than the space forming the fire hole 180, and a spur gear-shaped guide portion 41a. In addition, engagement recesses 44a are provided at two locations on the diameter line of the base end of the lower screw tube portion 42a for engaging a rotation operating tool such as a screwdriver.

[0095] The outer diameter of the guide portion 41a is slightly smaller than the inner diameter of the portion above the screw hole 17a in the space 100a, and the portion of the gas guide 4a is rotatable in the circumferential direction and movable back and forth along the inner periphery of the space 100a. In addition, between the inner periphery of the portion above the screw hole 17a in the space 100a and the guide portion 41a, a plurality of ventilation paths 400 (see FIG. 6) are formed in the circumferential direction of the guide portion 41a over the entire length of the guide portion 41a.

[0096] A gas feed hole 45a is provided in the center of the gas guide 4a over its entire length. The upper end of the gas feed hole 45a serves as a gas outlet 46. The gas feed hole 45a is a circular hole of the same diameter at the tip side corresponding to the guide section 41a and the neck section 40a, and is a tapered hole whose diameter increases downward at the base side corresponding to the lower threaded tube section 42a (see Figure 6). In addition, the neck section 40a is provided with communication holes 43a at two diametrical locations that penetrate the peripheral wall and lead to the gas feed hole 45a.

[0097] A stainless steel flow dividing member 3a is attached to the tip of the gas director 4a so as to cross the gas jet port 46 in the diameter direction outside the gas jet port 46, thereby forming jet ports 460, 460a.

[0098] The flow diverting member 3a is a pin-shaped member of a predetermined length with a circular cross section. One end of the flow diverting member 3a is inserted into a through-hole 47 provided in the guide portion 41a corresponding to the groove of the spur gear, and the flow diverting member 3a is fixed by, for example, rotating it upward so that it crosses the gas outlet 46, and bending the other end to fit into the groove (see the lower diagram in Figure 5).

[0099] In addition, by providing a through hole 47 on the opposite side of the gas guide 4a, and making the flow-diverting member a straight pin shape without bending the end like the flow-diverting member 3a, and passing it through both through holes 47 and fixing the gas outlet 46 horizontally, it is also possible to diverte the gas.

[0100] 6, the gas guide 4a can be screwed into the interior of the space 100a by inserting the guide portion 41a into the screw hole 17a of the nozzle base 10a, and then rotating and screwing the male thread of the lower screw tube portion 42a into the female thread of the screw hole 17a. Furthermore, even if the guide portion 41a enters the part of the space 100a where the fire hole 180 is located, the gas guide 4a can be screwed further in and moved, and then fixed by tightening the set screw 190 at an appropriate position, and the two are integrated to form the nozzle A3.

[0101] In addition, when the gas conductor 4a and the nozzle base 10a are integrated, the diverting member 3a provided on the gas conductor 4a is fixed by a set screw 190, positioned slightly inward from the fire hole 180, and adjusted to form a predetermined angle in the circumferential direction.

[0102] Then, a heating torch (not shown) is made by incorporating nozzle A3 in the same manner as nozzle A1, and similarly to heating torch 9 incorporating nozzle A1, the flame ejected from nozzle 180 is prevented from directly hitting the pressing surface of the pressing material, and an area can be formed in which the heating near the pressing surface is sufficient to enable pressing.

[0103] Furthermore, as in the case of the nozzle A1, if necessary, the gas guide member 4a can be rotated to adjust the angle of the nozzles 460, 460a, and the width of this area in the direction sandwiching the pressure-welding surface can be narrowed, or other adjustments can be made to suit the characteristics of the pressure-welding material, thereby adjusting the amount of heat input to the vicinity of the pressure-welding surface.

[0104] As described above, the nozzles A1, A2, and A3 can also be incorporated into the heating torch 9 for use, and a standard flame using a flammable gas such as propane gas may be used from the initial heating stage when pressure welding the materials 51 and 52. In other words, the standard flame does not directly heat the pressure welding surfaces 500 in the regions R1 and R2, and the vicinity of the pressure welding surfaces 500 is heated sufficiently to enable pressure welding, thereby preventing the formation of an oxide film on the pressure welding surfaces 500 during the pressure welding operation.

[0105] The terms and expressions used in the present specification and claims are merely for explanatory purposes and are not limiting in any way, and are not intended to exclude terms and expressions equivalent to the features described in the present specification and claims and parts thereof. It goes without saying that various modifications are possible within the scope of the technical idea of ​​the present invention. [Explanation of symbols]

[0106] A1 Crater 10 Crater base 100 space 11 Base screw pipe section 12 Flange 16 circular hole 16a Receiving hole 16b circular hole 18 Canal section 180 fire pit 181 Chamfered part 19 screw holes 190 Set screw 4 Gas Derivatives 41 Guidance part 410 teeth 411 Groove 400 Gas passage 42 Base screw pipe section 40 Neck 44 Engagement recess 45 Diversion jet channel 451 entrance 450, 450a spout 452, 452a spout path 453 Top part 43 Communication hole 4b Gas Derivatives 41b Guidance part 410b Teeth 411b Groove 9 Heating Torch 91 Branch Pipe 92 Burner tube 94 Mounting pipe 51, 52 Pressure welding material 500 pressure contact surface F1, F2 flames A2 crater 10 Crater base 6 Gas Derivatives 61 Guidance part 610 teeth 611 Groove 600 Gas passage 62 Base screw pipe section 60 neck 63 Communication hole 64 Engagement recess 65 Diversion jet channel 651 entrance 652, 652a spout path 653 Central vent 650, 650a spout 66 Vertical grooves 67 Divided Members A3 Crater 10a Crater base 100a space 11a Lower threaded pipe section 12a Flange 18a Upper pipe section 17a screw hole 180 fire pit 4a Gas Derivatives 42a Lower threaded pipe section 40a neck 41a Guidance part 44a Engagement recess 400 Ventilation Channel 45a Gas supply hole 46 Gas outlet 43a Communication hole 3a Diversion member 460, 460a spout 47 Through hole

Claims

1. a crater base having a fire hole at its tip; and a gas guide located inside the nozzle base, configured to be rotatable in the circumferential direction relative to the nozzle base and fixed at a predetermined position, which divides the gas flow passing through the nozzle, prevents the flame from directly hitting the pressure welding surface of the pressure welding material, and forms an area in which the vicinity of the pressure welding surface is heated sufficiently to enable pressure welding. crater.

2. The width of the region can be changed by rotating the gas guide in the circumferential direction of the nozzle base. The burner according to claim 1.

3. The gas guide is provided with a branching jet passage in which a plurality of jetting ports are formed to divide the gas flow passing through the fire hole. The burner according to claim 1 or 2.

4. The gas director has a hole formed in its longitudinal direction and a flow dividing member disposed across the hole in a substantially diametrical direction and dividing the gas flow passing through the hole. The burner according to claim 1 or 2.

5. a burner tube; The burner tube is attached to a nozzle base having a fire hole at its tip, and the nozzle is located inside the nozzle base and is rotatable in the circumferential direction relative to the nozzle base and can be fixed at a predetermined position, and the nozzle has a gas guide that divides the gas flow passing through the fire hole, prevents the flame from directly hitting the pressure welding surface of the pressure welding material, and forms an area where the vicinity of the pressure welding surface is heated sufficiently to enable pressure welding. Heating torch.

6. The method comprises the steps of: using a heating torch having a nozzle attached to a burner tube, the nozzle having a nozzle base with a nozzle hole at the tip and a gas inductor inside the nozzle base for dividing the gas flow passing through the nozzle hole; rotating the gas inductor in the circumferential direction of the nozzle base so that the flame does not directly hit the pressure welding surface of the pressure welding material; adjusting the width of the region where the heat in the vicinity of the pressure welding surface has been sufficiently achieved to enable pressure welding; and overlapping the region with the pressure welding surface of the pressure welding material, thereby heating the material. Gas pressure welding method.

7. The heating is carried out with a standard flame. The gas pressure welding method according to claim 6.

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