Crater, heating torch using the same, and gas pressure-welding method

Abstract

To provide a crater capable of suppressing oxidation on a pressure-welding surface by using a standard flame from initial heating without using a reduction material, when pressure-welding a pressure-welding material.SOLUTION: A crater A1 comprises; a crater substrate 10 with a crater hole 180 at its tip part; and a diverting jet passage 45 that is inclined at a predetermined angle so that mutual spacing widens toward the crater hole 180, splits a gas flow passing through the crater hole 180 into two directions, prevents a flame from directly hitting a pressure-welding surface 500 of a pressure-welding material, and forms a region R of a predetermined width in which an area near the welding surface 500 is heated sufficiently to enable pressure-welding.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a nozzle, a heating torch using the nozzle, and a gas pressure welding method. More specifically, the invention relates to a nozzle that can suppress oxidation even when using a standard flame from the initial heating stage when pressure welding pressure welding materials using a standard flame that uses a flammable gas such as propane gas, which is readily available regardless of region and has a low environmental impact. [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] Even when using a standard flame, these problems can be solved if the flame is not directly directed at the pressure welding surface and sufficient heating is achieved near the pressure welding surface. However, there have been few proposals for technology to split the flame used in pressure welding with a nozzle. However, a high-velocity jet-type diffusion combustion burner (see Patent Document 1) has been proposed, which is said to reduce the linearity of the combustible gas, adjust the flame length, and achieve optimal temperature distribution in the furnace. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-299955 Summary of the Invention [Problem to be solved by the invention]

[0007] In the above-mentioned conventional high-velocity jet diffusion combustion burner, the diffusion tip can diffuse the combustible gas toward the primary air flowing outside it. However, because the diffusion tip is conical, even if the flame expands, it remains a normal shape, and therefore it cannot be used as a nozzle structure for pressure welding, which requires the flame to be divided in directions sandwiching the pressure welding surface.

[0008] The present invention was devised in consideration of the above points, and aims to provide a nozzle that can prevent oxidation at the pressure welding surface even when a standard flame is used from the initial heating stage, for example, when pressure welding pressure welding materials using a standard flame that uses a flammable gas such as propane gas, which is steadily available regardless of region and has a small environmental impact, as well as a heating torch and gas pressure welding method that use the nozzle. [Means for solving the problem]

[0009] [1] In order to achieve the above object, the present invention provides a nozzle comprising a nozzle base with a fire hole at the tip, a gas inductor inside the nozzle base, and a branching jet passage provided in the gas inductor 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 of a predetermined width in which the vicinity of the press-fit surface is heated sufficiently to enable press-fitting.

[0010] The nozzle of the present invention is provided with a gas conductor separate from the nozzle base, so that even if a malfunction (e.g., deterioration over time) occurs in the function of the diversion jet passage, the gas conductor can be replaced and the malfunction can be easily resolved.

[0011] Furthermore, with the nozzle of the present invention, the combustible gas can be directed through the diverting jet passage toward the fire hole in the nozzle base. The diverting jet passage can divide the gas flow passing through the fire hole. Because the gas flow is guided by the diverting jet passage before it is ejected from the diverting jet passage, each flame is stable, allowing for stable and efficient heating of the pressure welding material.

[0012] Furthermore, by dividing the gas flow in the branch jet passage, the flames used to heat the pressure welding material are also divided. Each of the divided flames is prevented from directly hitting the pressure welding surface of the pressure welding material, and a region of a predetermined width can be formed in the vicinity of the pressure welding surface where heating is sufficient to enable pressure welding.

[0013] In this way, when pressure welding the pressure welding material, by not directing each flame directly at the pressure welding surface of the pressure welding material and by heating the area near the pressure welding surface sufficiently to enable pressure welding, oxidation of the pressure welding surface can be prevented even if standard flames are used from the initial heating.

[0014] This makes it possible to perform pressure welding of pressure welding materials using a standard flame with flammable gas such as propane gas, which is readily available and has a low environmental impact. Furthermore, the use of a reducing agent in combination can further suppress oxidation.

[0015] [2] In the nozzle of the present invention, in [1], the branching ejection path can be formed in the approximate longitudinal direction of the gas guide, and can have an ejection path that divides and guides the gas flow.

[0016] In this case, the diverting jet passages are formed in the approximate longitudinal direction of the gas guide and have jet passages that divide and guide the gas flow, so the gas flow is reliably directed toward the fire hole and divided by the diverting jet passages. In addition, because the gas flow is guided by the jet passages before it is ejected from the jet passages, each flame is stable, allowing the specified heating of the pressure welding material to be performed stably and efficiently.

[0017] [3] In the nozzle of the present invention, in [1], the branched ejection path is formed by dividing a hole provided in the gas guide in the approximately longitudinal direction by a dividing member, and can also be configured to have an ejection path that divides and guides the gas flow.

[0018] In this case, the divided jet passages are formed by dividing holes provided in the gas guide in the approximate longitudinal direction by a dividing member, and have jet passages that divide and guide the gas flow, so that the gas flow is reliably directed toward the fire hole and divided by the divided jet passages. Furthermore, because the gas flow is guided by the jet passages before it is ejected from the jet passages, each flame is stable, and the specified heating of the pressure welding material can be performed stably and efficiently.

[0019] [4] In the nozzle of the present invention, in [3], the hole may be configured so that its outlet widens in a trumpet shape.

[0020] In this case, the nozzle opening of the hole is expanded like a trumpet, so that the gas flow is split and the flame is split more reliably.

[0021] [5] In the burner of the present invention, in [1], [2], [3], and [4], the gas guide may be configured to be rotatable in the circumferential direction of the burner base and fixed at a predetermined position.

[0022] In this case, the gas director can rotate circumferentially relative to the nozzle base, making it possible to adjust the position (arrangement: circumferential angle) of the outlet of the splitting jet passage. This prevents the flames generated by splitting the gas flow from directly hitting the pressing surface of the pressing material, and also makes it possible to form an area of a specified width near the pressing surface that is heated sufficiently to enable pressing, and to adjust this area to fit the pressing surface of the pressing material.

[0023] [6] In the nozzle of the present invention, in [1], [2], [3], and [4], the tip of the gas guide may be configured in the shape of a gear that forms multiple gas passages between the nozzle base and the tip, and each tooth may be arranged parallel to the axial direction of the gas guide.

[0024] In this case, the tip of the gas conductor is formed in a gear shape that forms a gas passage between itself and the nozzle base, and each tooth is arranged parallel to the axial direction of the gas conductor, so that a gas passage is formed between the inner surface of the nozzle base by grooves between each tooth, and the gas passage is linear. Then, from the outlet of each gas passage, a gas flow is ejected linearly and parallel to the axial direction of the gas conductor.

[0025] This limits the area where the outer flame is formed to a predetermined range, and this outer flame formation area serves to prevent oxygen from being drawn into the inner flame, preventing oxygen from being drawn into the press-fit surfaces of the press-fit material. This prevents the formation of an oxide film on the press-fit surfaces, allowing for good welding of the press-fit surfaces.

[0026] [7] In the nozzle of the present invention, in [1], [2], [3], and [4], the tip of the gas guide may be configured in the shape of a gear that forms multiple gas passages between the nozzle base and the tip, and each tooth may be inclined with respect to the axial direction of the gas guide.

[0027] In this case, the tip of the gas conductor is formed in the shape of a gear that forms a gas passage between itself and the nozzle base, and each tooth is inclined with respect to the axial direction of the gas conductor, so that a gas passage is formed between the inner surface of the nozzle base and the inner surface of the nozzle base by grooves between each tooth, and the gas passage is spiral. Then, from the outlet of each gas passage, a gas flow is ejected at a predetermined angle with respect to the axial direction of the gas conductor and is discharged in a swirling manner.

[0028] 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 pressure-welded surfaces of the pressure-welded material. This prevents the formation of an oxide film on the pressure-welded surfaces, allowing for good welding of the pressure-welded surfaces.

[0029] [8] 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; a gas inductor inside the nozzle base; a diverting jet passage provided in the gas inductor, which divides the gas flow passing through the fire hole by the diverting jet passage so that the flame does not directly hit the press-fit surface of the press-fit material, and which can form an area of a predetermined width in which the vicinity of the press-fit surface is heated sufficiently to enable press-fitting.

[0030] The heating torch of the present invention divides the gas flow at the nozzle attached to the burner tube, thereby dividing the flame when heating the pressure welding material.

[0031] The nozzle prevents the flame from hitting the weld surface of the pressure-welding material directly, and can form a region of a predetermined width in the vicinity of the weld surface that is heated sufficiently to enable pressure welding. By overlapping this region with the weld surface, it is possible to heat the weld material to the desired level. This makes it possible to prevent oxidation of the weld surface even when a standard flame is used from the initial heating stage.

[0032] Therefore, it is possible to perform pressure welding of pressure welding materials using a standard flame with flammable gas such as propane gas, which is readily available and has a small environmental impact. Furthermore, by using a reducing agent in combination, it is possible to further suppress oxidation.

[0033] [9] In order to achieve the above object, the present invention provides a gas pressure welding method comprising the steps of: a nozzle base having a fire hole at the tip, a gas inductor inside the nozzle base, and a nozzle having a diverting jet passage provided in the gas inductor; using a heating torch attached to a burner tube, dividing the gas flow passing through the fire hole by the diverting jet passage so that the flame does not directly hit the pressure welding surface of the pressure welding material; forming an area of a predetermined width in which the vicinity of the pressure welding surface is heated sufficiently to enable pressure welding; and heating the area so that it overlaps the pressure welding surface of the pressure welding material.

[0034] The gas pressure welding method of the present invention divides the gas flow using a nozzle attached to a heating torch so that the flame does not directly hit the pressure welding surface of the pressure welding material, and forms an area of a specified width near the pressure welding surface that is heated sufficiently to enable pressure welding, and heating is carried out so that this area overlaps the pressure welding surface of the pressure welding material.

[0035] This makes it possible to prevent oxidation of the welded surfaces even when using a standard flame from the initial heating stage. Therefore, it is now possible to weld pressure weld materials using a standard flame, using flammable gases such as propane gas, which is readily available and has a low environmental impact. Furthermore, the use of a reducing agent in combination with the flame can further prevent oxidation.

[0036]

[10] In the gas pressure welding method of the present invention, in [9], the heating may be performed using a standard flame.

[0037] In this case, heating is performed using a standard flame, so by using gas other than acetylene gas, such as propane gas, oxidation at the pressure welding surface can be suppressed while obtaining sufficient heat for the pressure welding method, allowing the pressure welding work to be performed on the pressure welding material. [Effects of the Invention]

[0038] The present invention can provide a nozzle that can prevent oxidation at the pressure welding surface even when a standard flame is used from the initial heating stage, for example, when pressure welding pressure welding materials using a standard flame that uses propane gas or other flammable gas that is steadily available regardless of region and has a small environmental impact, as well as a heating torch and gas pressure welding method that use the nozzle. [Brief explanation of the drawings]

[0039] [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. 2 is an explanatory diagram showing the structure of a gas director of the first nozzle. [Figure 4] FIG. 10 is a perspective view showing another example of the gas director of the first burner port. [Figure 5] FIG. 10 is an exploded perspective view showing the structure of a second nozzle of the present invention. [Figure 6] FIG. 6 is a vertical cross-sectional view of the second nozzle shown in FIG. 5 in an assembled state. [Figure 7] FIG. 10 is an explanatory diagram showing the structure of the gas director of the second nozzle. [Figure 8] FIG. 10 is a perspective view showing another example of the gas director of the second nozzle. [Figure 9] 1 is a schematic plan view of a heating torch of the present invention. [Figure 10] FIG. 10 is an explanatory diagram showing the arrangement of each nozzle provided in the heating torch of FIG. [Figure 11] FIG. 2 is a partial cross-sectional explanatory view showing the direction of flame diversion in the nozzle of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0040] 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.

[0041] 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 burner A2, which will be described later.

[0042] 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.

[0043] The base screw pipe 11 has a male thread (reference numeral omitted) on its outer periphery. A screw hole 17 is provided on the inner periphery of the space 100 in a portion corresponding to the base screw pipe 11 and the flange portion 12 (see FIG. 2).

[0044] The space in space 100 located beyond threaded hole 17 penetrates the tip surface of tip tube portion 18, and the 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 threaded 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 threaded hole 19.

[0045] A gas guiding member 4 is housed inside the space 100 and is positioned at a predetermined height. The gas guiding member 4 has, in order from the base end, a base screw pipe portion 42 having a male thread (reference numeral omitted) on the outer periphery, a neck portion 40 having a diameter smaller than the space forming the fire hole 180, and a guide portion 41 having a substantially spur gear shape. In addition, the base screw pipe portion 42 has engagement recesses 44 at two locations on the diameter line of the base end portion for engaging a rotation operating tool such as a screwdriver.

[0046] 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 portion of the space 100 beyond the screw hole 17, and the gas guide 4 is rotatable in the circumferential direction and movable back and forth along the inner periphery of the space 100.

[0047] Furthermore, when the gas guide 4 is attached to the nozzle base 10 and integrated as described below, a plurality of gas passages 400 (shown in Figure 2) are formed in the circumferential direction of the guide section 41 between the inner periphery of the portion beyond the screw hole 17 in the space 100 and the guide section 41, extending over the entire length of the guide section 41.

[0048] 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.

[0049] 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.

[0050] 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 apex 453 as the boundary (see FIGS. 1 to 3). 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.

[0051] Furthermore, the neck portion 40 is provided with 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 then through each gas passage 400, when the gas guide 4 and the nozzle base 10 are integrated.

[0052] The gas conductor 4 is fixed inside the burner base 10 by first inserting the guiding part 41 into the screw hole 17 of the burner base 10, rotating the male thread of the base screw pipe part 42 when it engages with the female thread of the screw hole 17, screwing it in the direction toward the back of the space 100, and screwing the male thread of the base screw pipe part 42 up to the tip of the female thread of the screw hole 17. In this state, the edge line of the top 453 of the gas conductor 4 is located inward of the space 100 at a slight distance from the tip of the fire hole 180 (see Figure 2).

[0053] When the gas conductor 4 and the nozzle base 10 are integrated, the gas conductor 4 is fixed with a set screw 190 and adjusted so that the arrangement of the ejection paths 452, 452a is at a predetermined angle in the circumferential direction. As will be described later, when the press-contact surfaces 500 of the press-contact materials 51, 52 are heated, this angle is an angle at which the arrangement of the ejection paths 452, 452a is perpendicular to the press-contact surfaces 500 of the press-contact materials 51, 52 when the gas conductor 4 is attached to and assembled with the heating torch 9.

[0054] (Action of Crater A1) 9 to 11, the operation of the nozzle A1 will be described together with the operation of the heating torch 9 incorporating it.

[0055] First, the heating torch 9 according to the present invention will be described. 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 90 for introducing a combustible gas. A combustible gas supply pipe and an oxygen supply pipe (both not shown) having valves (reference numerals omitted) are connected to the base of the gas inlet pipe 90 so that they can merge.

[0056] A U-shaped branch pipe 91 is connected to the tip of the gas inlet pipe 90, and burner pipes 92 and 93, which are branch horizontal pipes, are connected to both ends of the branch pipe 91. The center lines of the gas inlet pipe 90, branch pipe 91, and burner pipes 92 and 93 are on the same plane (normally on a horizontal plane when installed).

[0057] Each of the burner tubes 92 and 93 has four nozzles A1 on the inside thereof, for a total of eight nozzles, which are screwed into a threaded mounting tube 94. In this embodiment, the number of nozzles is four for each tube, but this is not limited to this, and if the diameter of the pressure welding material is large, for example, five to ten nozzles or even more nozzles can be set.

[0058] Each nozzle A1 has its fire hole 180 facing inward (toward the center on the same plane), i.e., toward the pressure welding materials 51, 52 arranged between the burner tubes 92, 93 (see Figure 9). The gas guide 4 located near the fire hole 180 of each nozzle A1, more specifically, the edge line of the top 453 of the tip, is set to be approximately the same height as and approximately parallel to the center line of the burner tubes 92, 93 (see Figure 10).

[0059] In addition, above and below the nozzle A1 at the tip and base ends of the burner tubes 92, 93, nozzles A1a are provided at a slight angle above and below the horizontal and facing inward in the same way as nozzle A1, to heat parts of the pressure-welding materials 51, 52 that are slightly away from the pressure-welding surfaces 500 in the vertical direction.

[0060] Each nozzle A1a has a structure similar to that of nozzle A1, but the direction of the ejection paths 452, 452a is set to be perpendicular to the direction of the nozzle A1, that is, parallel to the circumferential direction of the pressure welding material (see Figure 10). The nozzles A1a are attached to the burner tubes 92, 93 at eight locations in total, two on each side of the top and bottom.

[0061] This allows combustible gas such as propane gas to be supplied from the combustible gas supply pipe and oxygen supply pipe to each nozzle A1 and each nozzle A1a fixed to the mounting pipe 94. The combustible gas mixed with oxygen (hereinafter referred to as combustible gas) is introduced through the screw hole 17 of the nozzle base 10 and enters the branch jetting path 45 of the gas guide 4.

[0062] 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 nozzles 450, 450a.

[0063] The combined combustible gases are ignited, and flames are ejected in two directions at a predetermined angle from the fire holes 180 of each nozzle A1 and each nozzle A1a (see Fig. 11). As shown in Figs. 9, 10, and 11(a), the flames splitting in two directions from each nozzle A1 are designed not to directly hit the press-contact surfaces 500 of the press-contact materials 51, 52, and are designed to form a region R of a predetermined width in which the vicinity of the press-contact surfaces 500 is heated sufficiently to enable press-contact (for convenience, only one nozzle A1 is shown in Fig. 11(a)).

[0064] Furthermore, as shown in Figures 9, 10 and 11(b), each flame splitting into two directions from each nozzle A1a can heat areas of the pressing surfaces 500 of the pressing materials 51 and 52 at a predetermined distance above and below in the circumferential direction of the axis, thereby enabling efficient heating over almost the entire circumference (for convenience, only one nozzle A1a is shown in Figure 11(b)).

[0065] The gas conductor 4 of the nozzle A1 can be rotated around its axis, and the arrangement (angle in the circumferential direction) of the nozzles 450, 450a can be adjusted by rotating the gas conductor 4. This makes it possible to align the region R, which is created by dividing the gas flow into two directions, with the pressure contact surfaces 500 of the pressure contact materials 51, 52. When it becomes necessary to adjust the distance from the tip of the fire hole 180, the gas conductor 4 can be adjusted by rotating it to change the screw position of the base screw pipe portion 42.

[0066] Furthermore, with the heating torch 9 incorporating the nozzle A1, 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, 52, the standard flames F1, F2 do 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, 52 becomes possible without using a reducing agent.

[0067] In this embodiment, the pressure welding materials 51, 52 are supported in a vertical position, and the burner tubes 92, 93 of the heating torch 9 are positioned horizontally to perform gas pressure welding. However, this is not limited to this, and the pressure welding materials 51, 52 can also be supported horizontally and the burner tubes 92, 93 of the heating torch 9 can be positioned vertically to perform the gas pressure welding.

[0068] 4 shows a gas conductor 4a, which is a modified example of the gas conductor 4. In the following description, parts of the structure of the gas conductor 4a that are common to the gas conductor 4 are denoted by the same reference numerals as those of the gas conductor 4, and a description of the structure here will be omitted.

[0069] The gas guide 4a is provided with a gear-shaped guide portion 41a. Unlike the teeth 410 of the guide portion 41, each tooth 410a of the guide portion 41a is inclined at a predetermined angle relative to the axial direction and has a spiral shape, with grooves 411a formed between them.

[0070] When the gas guide 4a is attached to the nozzle base 10 and integrated, a spiral gas passage (symbol omitted) consisting of multiple grooves circumferentially of the guide portion 41a is formed over the entire length of the guide portion 41a between the inner peripheral portion beyond the screw hole 17 in the space 100 and the guide portion 41a.

[0071] During use, the gas flows are ejected from the nozzles of each gas passage at a predetermined angle relative to the axial direction of the gas guide 4a and are discharged in a swirling manner. This expands the area where the outer flame is formed, which 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.

[0072] 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 Figures 5 to 8. 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 a description of the structure here will be omitted.

[0073] A space 100 is provided in the nozzle base 10 of the nozzle A2, and a gas guide 6 is housed inside the space 100 and positioned at a predetermined height. The gas guide 6 has, in order from the base end, a base screw pipe portion 62 having a male thread (reference number omitted) on the outer periphery, a neck portion 60 whose diameter is smaller than the space that forms the fire hole 180, and a guide portion 61 that is approximately spur gear shaped. Two engagement recesses 64 are provided on the diameter line of the base end of the base screw pipe portion 62 for engaging a rotation operating tool such as a screwdriver.

[0074] 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 portion of the space 100 beyond the screw hole 17, and the gas guide 6 is rotatable in the circumferential direction and movable back and forth along the inner periphery of the space 100.

[0075] Furthermore, when the gas guide 6 is attached to the nozzle base 10 and integrated, a plurality of gas passages 600 (shown in Figure 6) are formed in the circumferential direction of the guide portion 61 between the inner periphery of the portion beyond the screw hole 17 in the space 100 and the guide portion 61, over the entire length of the guide portion 61.

[0076] A diverted flow ejection passage 65 is provided inside the gas guiding member 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 whose base end communicates with the inlet 651 and whose tip end penetrates the front end surface of the gas guiding member 6. The central ejection hole 653 is an elliptical hole whose opening (reference numeral omitted) is slightly bulged in the diameter direction (see the lower diagram in Figure 5). The front end surface of the gas guiding member 6 is perpendicular to the axial direction of the guide portion 61 (see Figure 6).

[0077] 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.

[0078] The bottom of the vertical groove 66 is formed in a generally circular shape and is slightly wider, and the bent and enlarged portion of the divided member 67 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.

[0079] 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.

[0080] After the central ejection hole 653 is separated and attached to the divided member 67, holes can be drilled at a predetermined angle from both sides of the divided member 67 to further adjust the shape of the ejection paths 652, 652a. In this case, similar to the ejection paths 452, 452a of the nozzle A1, the angle of the ejection paths 652, 652a is not particularly limited.

[0081] The shape of the nozzles 650, 650a is not particularly limited and may be semi-elliptical, semi-circular, or other irregular shapes. In addition, part of the dividing member 67 may or may not be removed when drilling, and the shape of the nozzles 650, 650a is not particularly limited as long as the flame spreads in two directions at a predetermined angle.

[0082] 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.

[0083] The mouth at the tip of the central injection hole 653 can also be formed to be widened like a trumpet. In this case, the gas flow is divided along the surface of the widened mouth, so that the flame is divided and spread more reliably.

[0084] 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. 6).

[0085] When the gas conductor 6 and the nozzle base 10 are integrated, the gas conductor 6 is fixed with a set screw 190 and adjusted so that the arrangement of the ejection paths 652, 652a is at a predetermined angle in the circumferential direction. When the press-contact surfaces 500 of the press-contact materials 51, 52 are heated, this angle is an angle at which the arrangement of the ejection paths 652, 652a is perpendicular to the press-contact surfaces 500 of the press-contact materials 51, 52 when the gas conductor 6 and the nozzle base 10 are attached to the heating torch 9 and assembled.

[0086] (Action of Crater A2) 5 to 8, and also with reference to Figures 9 to 11, the operation of the nozzle A2 will be explained together with the operation of the heating torch 9 incorporating it. Note that the overall flow when performing pressure welding is the same as that of the nozzle A1, so common parts will be explained briefly or omitted.

[0087] Combustible gas such as propane gas can be supplied from a combustible gas supply pipe and an oxygen supply pipe to each nozzle A2 fixed to the mounting pipe 94. The combustible gas is introduced through the screw hole 17 of the nozzle base 10 and enters the branch jet passage 65 of the gas guide 6.

[0088] The pressure of the combustible gas passing through the divided jet passage 65 is maintained at a substantially constant high pressure, and part of the combustible gas passes through the jet passages 652, 652a of the divided jet passage 65 and is ejected from the nozzles 650, 650a toward the fire hole 180 so as to spread at a predetermined angle. Another part of the combustible gas passes from the divided jet passage 65 through the communication holes 63, enters the space 100, passes through the gas passages 600, and merges with the combustible gas ejected from the nozzles 650, 650a.

[0089] The combined combustible gases are ignited, and flames are ejected in two directions at a predetermined angle from the fire holes 180 of each nozzle A2. The flames splitting into two directions from each nozzle A2 are designed not to directly hit the press-contact surfaces 500 of the pressure-contact materials 51, 52, and are designed to form a region R of a predetermined width in which the vicinity of the press-contact surfaces 500 is heated sufficiently to enable pressure welding (see Figs. 9 to 11(a)).

[0090] The gas director 6 of the nozzle A2 can be rotated around its axis, and the arrangement (angle in the circumferential direction) of the nozzles 650, 650a can be adjusted by rotating the gas director 6. This makes it possible to align the region R, which is generated by dividing the gas flow into two directions, with the pressure contact surfaces 500 of the pressure contact materials 51, 52.

[0091] Furthermore, with the heating torch 9 incorporating the nozzle A2, 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, 52, the standard flames F1, F2 do 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, 52 becomes possible without using a reducing agent.

[0092] 8 shows a gas conductor 6a, which is a modified example of the gas conductor 6. In the following description, parts of the structure of the gas conductor 6a that are common to the gas conductor 6 are denoted by the same reference numerals as those of the gas conductor 6, and a description of the structure here will be omitted.

[0093] The gas guide 6a is provided with a gear-shaped guide portion 61a. Unlike the teeth 610 of the guide portion 61, each tooth 610a of the guide portion 61a is inclined at a predetermined angle relative to the axial direction and has a spiral shape, with grooves 611a formed between them.

[0094] The dividing member 67a is provided in the same manner as the dividing member 67 of the gas guide 6, but the teeth 610a are inclined, so that the longitudinal grooves 66 intersect with the teeth 610a at two opposing locations and are cut out.

[0095] When the gas guide 6a is attached to the nozzle base 10 and integrated, a spiral gas passage (symbol omitted) consisting of multiple grooves circumferentially of the guide portion 61a is formed over the entire length of the guide portion 61a between the inner peripheral portion beyond the screw hole 17 in the space 100 and the guide portion 61a.

[0096] During use, the gas flows are ejected from the nozzles of each gas passage at a predetermined angle relative to the axial direction of the gas guide 6a and are discharged in a swirling manner. This expands the area where the outer flame is formed, which 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.

[0097] In addition, the above-mentioned nozzles A1 and A2 can also be incorporated into the heating torch 9 and used. When pressure welding the pressure welding materials 51 and 52, even if a standard flame using a flammable gas such as propane gas is used from the initial heating, the standard flame does not directly heat the pressure welding surface 500 in the region R, and the heating in the vicinity of the pressure welding surface 500 is sufficient to enable pressure welding, so the formation of an oxide film on the pressure welding surface 500 is suppressed, and the formation of an oxide film on the pressure welding surface 500 can be suppressed even without using a reducing agent.

[0098] 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]

[0099] A1 Crater 10 Crater base 100 space 11 Base screw pipe section 12 Flange 17 screw holes 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 43 Communication hole 190 Set screw 4a Gas Derivatives 41a Guidance part 410a Teeth 411a Groove 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 6a Gas Derivatives 61a Guidance part 610a Teeth 611a Groove 67a Divided member 9 Heating Torch 90 Gas inlet pipe 91 Branch Pipe 92, 93 Burner tube 94 Mounting pipe 51, 52 Pressure welding material 500 pressure contact surface F1, F2 flames

Claims

1. a crater base having a fire hole at its tip; a gas director within the crater base; and a diverting jet passage provided in the gas conductor, which 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 of a predetermined width in which the vicinity of the pressure welding surface is heated sufficiently to enable pressure welding. crater.

2. The branch jet passage is formed in the approximate longitudinal direction of the gas guide and has jet passages that divide and guide the gas flow. The burner according to claim 1.

3. The divided flow ejection path is formed by dividing a hole provided in the gas guide in the approximately longitudinal direction by a dividing member, and has ejection paths that divide and guide the gas flow. The burner according to claim 1.

4. The hole has a trumpet-shaped opening. The nozzle according to claim 3.

5. The gas guide is rotatable in the circumferential direction of the nozzle base and is fixable at a predetermined position.

5. The burner according to claim 1, 2, 3 or 4.

6. The tip of the gas guiding member is formed in a gear shape to form a plurality of gas passages between the tip of the gas guiding member and the nozzle base, and each tooth of the gear is formed parallel to the axial direction of the gas guiding member.

5. The burner according to claim 1, 2, 3 or 4.

7. The tip of the gas guiding member is formed in a gear shape to form a plurality of gas passages between the tip of the gas guiding member and the nozzle base, and each tooth of the gear is inclined with respect to the axial direction of the gas guiding member.

5. The burner according to claim 1, 2, 3 or 4.

8. a burner tube; The burner includes a nozzle base attached to the burner tube and having a fire hole at its tip, a gas inductor inside the nozzle base, and a diverting jetting path provided in the gas inductor, which divides the gas flow passing through the fire hole at the diverting jetting path to prevent the flame from directly hitting the press-welding surface of the pressure-welding material, and is capable of forming an area of a predetermined width in which the vicinity of the press-welding surface is heated sufficiently to enable pressure welding. Heating torch.

9. The method comprises the steps of: using a heating torch attached to a burner tube, a nozzle base having a fire hole at its tip, a gas inductor inside the nozzle base, and a diverting jet passage provided in the gas inductor; dividing the gas flow passing through the fire hole at the diverting jet passage so that the flame does not directly hit the pressure welding surface of the pressure welding material; forming an area of a predetermined width in which the vicinity of the pressure welding surface is heated sufficiently to enable pressure welding; and heating the area so that the area overlaps the pressure welding surface of the pressure welding material. Gas pressure welding method.

10. The heating is carried out with a standard flame. The gas pressure welding method according to claim 9.

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