Pinhole plasma welding tail flame voltage acquisition and back gas protection integrated device

Abstract

The invention provides a small hole plasma welding tail flame voltage collection and back gas protection integrated device, and relates to the technical field of welding equipment.The device comprises a gas chamber box, and the gas chamber box is of a rectangular shell structure with an opening in the upper end; the arc pressure detection plate is connected to the end, provided with the opening, of the air chamber box, a plurality of through holes are evenly distributed in the arc pressure detection plate, the arc pressure detection plate is used for being arranged on the back face of a weld joint of a workpiece to be welded, and a gap is reserved between the arc pressure detection plate and the weld joint; the multi-stage gas flow divider is arranged in the gas chamber box, and the multi-stage gas flow divider is used for uniformly introducing welding shielding gas into the gas chamber box; and the welding control system is used for being electrically connected with the arc voltage detection plate and the to-be-welded workpiece. Compared with the prior art, the small-hole plasma welding tail flame voltage acquisition and back gas protection integrated device can improve the stability and the welding quality of small-hole plasma welding.

Description

Technical Field

[0001] The invention relates to the technical field of welding equipment, and in particular to an integrated device for collecting tail flame voltage and back gas protection in pinhole plasma welding. Background Art

[0002] Small hole plasma welding technology is a welding method that uses a high-temperature plasma arc as a heat source. It forms a small hole between the tungsten electrode and the workpiece, ionizing the gas in the hole to form a plasma arc, thereby heating the workpiece to a molten state to achieve welding.

[0003] However, the keyhole plasma welding technology is still in the development stage. During the welding process, problems such as too fast welding speed, too high arc voltage, and too low arc voltage are prone to occur, and the stability and quality of keyhole plasma welding cannot be guaranteed. Summary of the invention

[0004] The problem to be solved by the present invention is: how to improve the stability and welding quality of keyhole plasma welding.

[0005] The present invention provides an integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding, comprising:

[0006] An air chamber box, wherein the air chamber box is a rectangular shell structure with an open upper end;

[0007] An arc voltage detection plate, the arc voltage detection plate is connected to the end of the air chamber box having the open opening, and the arc voltage detection plate is evenly distributed with a plurality of through holes, and the arc voltage detection plate is used to be placed on the back of the weld of the workpiece to be welded, and a gap is left between the arc voltage detection plate and the weld;

[0008] A multi-stage gas diverter, the multi-stage gas diverter is arranged inside the gas chamber box, the multi-stage gas diverter is used to evenly introduce welding shielding gas into the gas chamber box, and the welding shielding gas in the gas chamber box is used to evenly blow to the back of the weld through the multiple through holes;

[0009] A welding control system is used to be electrically connected to the arc voltage detection plate and the workpiece to be welded respectively to detect the voltage between the arc voltage detection plate and the workpiece to be welded.

[0010] The invention provides an integrated device for collecting tail flame voltage and back gas protection for pinhole plasma welding, which has, but is not limited to, the following beneficial effects compared with the prior art:

[0011] The integrated device for collecting tail flame voltage and back gas protection for small hole plasma welding described in the present invention is used to be placed on the back of the weld of the workpiece to be welded, specifically, the arc voltage detection plate faces the back of the weld and leaves a gap between the arc voltage detection plate and the weld. During small hole plasma welding, the tail flame impacts the arc voltage detection plate, and the voltage between the arc voltage detection plate and the workpiece is collected by the welding control system, and the voltage stability is controlled. For example, when the voltage between the arc voltage detection plate and the workpiece collected by the welding control system exceeds or is lower than the preset voltage value, the welding control system correspondingly reduces or increases the tail flame voltage during small hole plasma welding, thereby avoiding the situation where the arc voltage is too high or too low, so as to control the stability of the small hole welding process and improve the welding quality. In addition, small hole plasma welding requires back gas protection, and the welding shielding gas (such as argon) can be evenly introduced into the gas chamber box through a multi-stage gas diverter, and then evenly blown to the back of the weld through the through hole on the arc voltage detection plate to form back gas protection, thereby ensuring the quality of the weld. Compared with the prior art, the integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding of the present invention can improve the stability and welding quality of small hole plasma welding.

[0012] Optionally, the multi-stage gas diverter includes a primary gas pipe, a main three-way joint and a branch gas pipe, one end of the primary gas pipe is connected to one of the interfaces of the main three-way joint, and the other end is used to extend out of the gas chamber box and connect to the protective gas source, the two branch gas pipes are respectively connected to the other two interfaces of the main three-way joint, and the two branch gas pipes are respectively evenly distributed with multiple air outlets.

[0013] Optionally, the branch air pipe includes a secondary branch air pipe, a branch three-way joint and a terminal branch air pipe, one end of the secondary branch air pipe is connected to the main three-way joint, and the other end is connected to one of the interfaces of the branch three-way joint, and the two terminal branch air pipes are respectively connected to the other two interfaces of the branch three-way joint, and multiple air outlet holes are evenly distributed on the two terminal branch air pipes.

[0014] Optionally, the air outlet is arranged toward the bottom wall inside the air chamber box.

[0015] Optionally, the integrated device for collecting tail flame voltage and back gas protection during pinhole plasma welding further includes a high temperature resistant insulating gasket, which is arranged between the arc voltage detection plate and the gas chamber box.

[0016] Optionally, the integrated device for small-hole plasma welding tail flame voltage collection and back gas protection also includes an insulating screw, a first connecting hole is provided on the arc voltage detection plate, a second connecting hole is provided on the high-temperature resistant insulating gasket, and a first threaded hole is provided on the air chamber box. The insulating screw is used to pass through the first connecting hole and the second connecting hole in sequence and be connected to the first threaded hole to connect the arc voltage detection plate and the high-temperature resistant insulating gasket to the air chamber box.

[0017] Optionally, the integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding also includes a height adjustment plate, which is connected to the outer wall of the air chamber box, and the height of the height adjustment plate relative to the air chamber box in the vertical direction is adjustable to adjust the distance between the arc voltage detection plate and the weld.

[0018] Optionally, a second threaded hole is provided on the outer side wall of the air chamber box, and a long slot hole is provided on the height adjustment plate, and the second threaded hole and the long slot hole are used to be connected by screws to connect the height adjustment plate to the air chamber box.

[0019] Optionally, a voltage detection lead interface is provided on the arc voltage detection board.

[0020] Optionally, a cooling water channel is provided inside the arc voltage detection plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 An exploded view of a pinhole plasma welding tail flame voltage collection and back gas protection integrated device according to an embodiment of the present invention;

[0022] Figure 2 A reference diagram of the use status of the integrated device for collecting tail flame voltage and back gas protection of pinhole plasma welding according to an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the structure of a multi-stage gas splitter according to an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] Air chamber box 1, second threaded hole 11;

[0026] Arc voltage detection board 2, through hole 21, voltage detection lead interface 22;

[0027] Multi-stage gas diverter 3, primary gas pipe 31, main three-way joint 32, branch gas pipe 33, secondary branch gas pipe 331, branch three-way joint 332, terminal branch gas pipe 333;

[0028] High temperature resistant insulating gasket 4;

[0029] Insulation screw 5;

[0030] Height adjustment plate 6, long slot hole 61;

[0031] Workpiece to be welded 7, weld 71;

[0032] Welding tooling 100. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] In the description of the present invention, the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “top”, “bottom”, “front”, “back”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment" and "one implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0037] Moreover, the Z-axis in the accompanying drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis (that is, the direction of the arrow of the Z-axis) represents the top, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents the bottom; the X-axis in the accompanying drawings represents the horizontal direction, that is, the left and right position, and the positive direction of the X-axis (that is, the direction of the arrow of the X-axis) represents the left, and the negative direction of the X-axis (that is, the direction opposite to the positive direction of the X-axis) represents the right; the Y-axis in the accompanying drawings represents the longitudinal direction, that is, the front and back position, and the positive direction of the Y-axis (that is, the direction of the arrow of the Y-axis) represents the front, and the negative direction of the Y-axis (that is, the direction opposite to the positive direction of the Y-axis) represents the back.

[0038] It should also be noted that the aforementioned Z-axis, X-axis and Y-axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0039] At present, the keyhole plasma welding technology is still in the development stage. During the welding process, problems including but not limited to the following are likely to occur, which makes it impossible to guarantee the keyhole plasma welding stability and welding quality.

[0040] 1. Welding speed is too fast:

[0041] If the welding speed is too fast, it may result in an incomplete weld or insufficient weld strength. Due to insufficient welding heat input, the material is not completely melted, and defects such as pores or cracks may form.

[0042] 2. The arc voltage is too high:

[0043] Excessive arc voltage usually leads to excessive welding heat input, which may cause overheating, deformation or burn-through of the parent material. In keyhole plasma welding, excessive arc voltage may also make the weld shape irregular, affecting the appearance and strength of the weld.

[0044] 3. Arc voltage is too low:

[0045] If the arc voltage is too low, the arc may be unstable, affecting the continuity of the welding process and easily causing arc breaking. In addition, large nuggets may form in the weld and the weld lines may be uneven.

[0046] In order to improve the stability and welding quality of small hole plasma welding, the present invention proposes an integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding.

[0047] like Figures 1 to 2 As shown, the integrated device for collecting tail flame voltage and back gas protection of pinhole plasma welding according to the embodiment of the present invention comprises:

[0048] An air chamber box 1, wherein the air chamber box 1 is a rectangular shell structure with an open upper end;

[0049] An arc voltage detection plate 2, the arc voltage detection plate 2 is connected to the open end of the air chamber box 1, and a plurality of through holes 21 are evenly distributed on the arc voltage detection plate 2, and the arc voltage detection plate 2 is used to be placed on the back of the weld 71 of the workpiece 7 to be welded, and a gap is left between the arc voltage detection plate 2 and the weld 71;

[0050] A multi-stage gas diverter 3, the multi-stage gas diverter 3 is arranged inside the gas chamber box 1, the multi-stage gas diverter 3 is used to evenly introduce welding shielding gas into the gas chamber box 1, and the welding shielding gas in the gas chamber box 1 is used to evenly blow to the back of the weld 71 through the plurality of through holes 21;

[0051] A welding control system, wherein the welding control system is used to be electrically connected to the arc voltage detection plate 2 and the workpiece 7 to be welded, respectively, so as to detect the voltage between the arc voltage detection plate 2 and the workpiece 7 to be welded.

[0052] In this embodiment, combined with the attached Figure 1 and attached Figure 2 As shown, the workpiece 7 to be welded can be placed on the welding tool 100, and the device can be placed on the welding tool 100 and is located on the back side of the weld 71 of the workpiece 7 to be welded, specifically, the arc voltage detection plate 2 faces the back side of the weld 71 and leaves a gap between the arc voltage detection plate 2 and the weld 71. During small-hole plasma welding, the tail flame impacts the arc voltage detection plate 2, and the voltage between the arc voltage detection plate 2 and the workpiece (the workpiece 7 to be welded) is collected through the welding control system, and the voltage stability is controlled. For example, when the voltage collected by the welding control system between the arc voltage detection plate 2 and the workpiece exceeds or is lower than a preset voltage value, the welding control system correspondingly reduces or increases the tail flame voltage during small-hole plasma welding, thereby avoiding the situation where the arc voltage is too high or too low, so as to control the stability of the small-hole plasma welding process and improve the welding quality.

[0053] In the plasma welding process, back gas protection is crucial. This is mainly because without back gas protection, the molten pool is easily contaminated by the outside air, resulting in the formation of oxides and other impurities. This situation will cause pores to appear inside the weld, reduce the density and strength of the weld, affect the appearance quality of the weld, and may even cause the appearance of cracks. Back gas protection provides a protective gas on the back of the weld to form a protective gas curtain to ensure that the molten pool is not contaminated, and applies a certain pressure to the molten pool to ensure the quality of the weld. In this device, the welding shielding gas (such as argon) can be evenly introduced into the gas chamber box 1 through the multi-stage gas diverter 3, and then evenly blown to the back of the weld 71 through the through hole 21 on the arc voltage detection plate 2 to form back gas protection, thereby ensuring the quality of the weld. Compared with the prior art, the integrated device for collecting the tail flame voltage and back gas protection of small hole plasma welding of the present invention can improve the stability and welding quality of small hole plasma welding.

[0054] In addition, the air chamber box 1 is the upper end (attached Figure 1 The air chamber box 1 has an open rectangular shell structure (in the positive direction of the middle Z axis), and the air chamber box 1 can be manufactured in an integrated manner according to the length of the weld 71 of the workpiece 7 to be welded. Figure 1 The length of the weld 71 may be slightly larger than the length of the weld 71 (in the X-axis direction).

[0055] Optionally, the multi-stage gas diverter 3 includes a primary gas pipe 31, a main three-way joint 32 and a branch gas pipe 33, one end of the primary gas pipe 31 is connected to one of the interfaces of the main three-way joint 32, and the other end is used to extend out of the gas chamber box 1 and connect to the protective gas source, the two branch gas pipes 33 are respectively connected to the other two interfaces of the main three-way joint 32, and the two branch gas pipes 33 are respectively evenly distributed with multiple air outlets.

[0056] In this embodiment, combined with the attached Figure 1 and attached Figure 3 As shown, one end of the primary gas pipe 31 can extend out of the gas chamber box 1 and be connected to a shielding gas source, and the shielding gas source can pass the welding shielding gas (such as argon) into the primary gas pipe 31, and the welding shielding gas in the primary gas pipe 31 can be respectively passed into the two branch gas pipes 33 through the main three-way joint 32, and the welding shielding gas in the two branch gas pipes 33 can be respectively discharged into the gas chamber box 1 through the gas outlet holes thereon, so that the welding shielding gas is evenly sent into the gas chamber box 1, ensuring the uniformity of the gas pressure in the long gas chamber box 1. In addition, a threaded hole can be opened on the main three-way joint 32 for connecting to the gas chamber box 1 by bolts.

[0057] Optionally, the branch air pipe 33 includes a secondary branch air pipe 331, a branch three-way joint 332 and a terminal branch air pipe 333, one end of the secondary branch air pipe 331 is connected to the main three-way joint 32, and the other end is connected to one of the interfaces of the branch three-way joint 332, and the two terminal branch air pipes 333 are respectively connected to the other two interfaces of the branch three-way joint 332, and the two terminal branch air pipes 333 are evenly distributed with multiple air outlets.

[0058] In this embodiment, combined with the attached Figure 3 As shown, the branch gas pipe 33 includes a secondary branch gas pipe 331, a branch three-way joint 332 and a terminal branch gas pipe 333. The welding shielding gas in the primary gas pipe 31 can be introduced into the secondary branch gas pipe 331 through the main three-way joint 32, and the welding shielding gas in the secondary branch gas pipe 331 can be introduced into the terminal branch gas pipe 333 through the branch three-way joint 332. The welding shielding gas in the terminal branch gas pipe 333 can be discharged into the gas chamber box 1 through the gas outlet holes thereon. Through the gas distribution design, the main gas is divided into multiple branches to achieve gas homogenization, so that the gas pressure is uniform in the entire gas chamber box 1. In addition, a threaded hole can be opened on the branch three-way joint 332 for connecting to the gas chamber box 1 by bolts.

[0059] Optionally, the air outlet is arranged toward the bottom wall inside the air chamber box 1 .

[0060] In this embodiment, combined with the attached Figure 1 and attached Figure 3 As shown, the air outlet is arranged toward the bottom wall inside the air chamber box 1, so that the welding shielding gas sent into the air chamber box 1 from the air outlet can be output toward the bottom wall of the air chamber box 1, and after being evenly diffused in the air chamber box 1, it overflows from the through hole 21 on the arc voltage detection plate 2, thereby ensuring the uniformity of the gas pressure in the air chamber box 1.

[0061] Optionally, the integrated device for collecting tail flame voltage and back gas protection during pinhole plasma welding further includes a high temperature resistant insulating gasket 4 , which is disposed between the arc voltage detection plate 2 and the gas chamber box 1 .

[0062] In this embodiment, combined with the attached Figure 1 As shown, a high temperature resistant insulating gasket 4 is installed between the arc voltage detection plate 2 and the air chamber box 1, wherein the high temperature resistant insulating gasket 4 can be made of polyetheretherketone material, which has good insulation performance and high temperature resistance, thereby achieving insulation between the arc voltage detection plate 2 and the air chamber box 1.

[0063] Optionally, the integrated device for small-hole plasma welding tail flame voltage collection and back gas protection also includes an insulating screw 5, a first connecting hole is opened on the arc voltage detection plate 2, a second connecting hole is opened on the high-temperature resistant insulating gasket 4, and a first threaded hole is opened on the gas chamber box 1, and the insulating screw 5 is used to pass through the first connecting hole and the second connecting hole in sequence and be connected to the first threaded hole to connect the arc voltage detection plate 2 and the high-temperature resistant insulating gasket 4 to the gas chamber box 1.

[0064] In this embodiment, combined with the attached Figure 1 As shown, the four corners of the arc voltage detection plate 2 are respectively provided with first connecting holes, the four corners of the high temperature resistant insulating gasket 4 are respectively provided with second connecting holes, and the four corners of the upper end of the air chamber box 1 are respectively provided with first threaded holes. The insulating screw 5 can pass through the first connecting hole and the second connecting hole in sequence and be connected to the first threaded hole to connect the arc voltage detection plate 2 and the high temperature resistant insulating gasket 4 to the air chamber box 1.

[0065] It should be noted that the insulating screw 5 can be made of polyetheretherketone material, which has good insulation properties on the one hand, and good mechanical strength on the other hand, which can ensure the stable installation of the arc voltage detection board 2 and the high temperature resistant insulating gasket 4.

[0066] Optionally, the integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding also includes a height adjustment plate 6, which is connected to the outer wall of the air chamber box 1, and the height of the height adjustment plate 6 relative to the air chamber box 1 in the vertical direction is adjustable to adjust the distance between the arc voltage detection plate 2 and the weld 71.

[0067] In this embodiment, combined with the attached Figure 1 and attached Figure 2 As shown, height adjustment plates 6 are respectively arranged on the two long side walls outside the air chamber box 1, and the height adjustment plates 6 are vertically (with respect to the air chamber box 1) with respect to the air chamber box 1. Figure 1 The height of the height adjustment plate 6 (in the Z-axis direction) is adjustable, and the lower part of the height adjustment plate 6 can be supported on the welding tool 100. By adjusting the relative position of the height adjustment plate 6, the distance between the arc voltage detection plate 2 and the weld 71 can be adjusted to meet the requirements.

[0068] Optionally, a second threaded hole 11 is opened on the outer wall of the air chamber box 1, and a long slot hole 61 is opened on the height adjustment plate 6. The second threaded hole 11 and the long slot hole 61 are used to be connected by screws to connect the height adjustment plate 6 to the air chamber box 1.

[0069] In this embodiment, combined with the attached Figure 1 As shown, a plurality of second threaded holes 11 are respectively provided on the two long side walls outside the air chamber box 1, and a plurality of long slot holes 61 are provided on the height adjustment plate 6, wherein the extending direction of the long slot holes 61 is the height direction of the air chamber box 1 (see FIG. Figure 1 In the middle Z-axis direction), in this way, the second threaded hole 11 is connected to the long slot hole 61 at different positions by screws, so that the height adjustment plate 6 can be fixed at different heights of the air chamber box 1, thereby adjusting the distance between the arc pressure detection plate 2 and the weld 71.

[0070] Optionally, a voltage detection lead interface 22 is provided on the arc voltage detection board 2 .

[0071] In this embodiment, a voltage detection lead interface 22 is processed at one end of the arc voltage detection board 2 for installing the arc voltage collection lead.

[0072] Optionally, a cooling water channel is provided inside the arc voltage detection plate 2 .

[0073] In this embodiment, the arc voltage detection plate 2 can be made of copper material, wherein copper has good electrical and thermal conductivity. The arc voltage detection plate 2 is internally processed with a cooling water path, and forced water cooling is performed under long-term continuous use conditions to prevent the product from being burned by the arc.

[0074] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0075] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. An integrated device for collecting tail flame voltage and back gas protection in small hole plasma welding, characterized in that: include: An air chamber box (1), wherein the air chamber box (1) is a rectangular shell structure with an open upper end; an arc voltage detection plate (2), the arc voltage detection plate (2) being connected to the open end of the air chamber box (1), and having a plurality of through holes (21) evenly distributed on the arc voltage detection plate (2), the arc voltage detection plate (2) being used to be placed on the back of a weld (71) of a workpiece (7) to be welded, with a gap between the arc voltage detection plate (2) and the weld (71); A multi-stage gas flow divider (3), the multi-stage gas flow divider (3) being arranged inside the gas chamber box (1), the multi-stage gas flow divider (3) being used to uniformly introduce welding shielding gas into the gas chamber box (1), and the welding shielding gas in the gas chamber box (1) being used to be uniformly blown to the back side of the weld (71) through the plurality of through holes (21); A welding control system, the welding control system is used to be electrically connected to the arc voltage detection plate (2) and the workpiece to be welded (7) respectively, so as to detect the voltage between the arc voltage detection plate (2) and the workpiece to be welded (7).

2. The integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding according to claim 1 is characterized in that: The multi-stage gas diverter (3) comprises a primary gas pipe (31), a main three-way joint (32) and a branch gas pipe (33); one end of the primary gas pipe (31) is connected to one of the interfaces of the main three-way joint (32), and the other end is used to extend out of the gas chamber box (1) and connect to a protective gas source; the two branch gas pipes (33) are respectively connected to the other two interfaces of the main three-way joint (32); and a plurality of gas outlet holes are evenly distributed on the two branch gas pipes (33).

3. The integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding according to claim 2 is characterized in that: The branch air pipe (33) comprises a secondary branch air pipe (331), a branch three-way joint (332) and a terminal branch air pipe (333); one end of the secondary branch air pipe (331) is connected to the main three-way joint (32), and the other end is connected to one of the interfaces of the branch three-way joint (332); the two terminal branch air pipes (333) are respectively connected to the other two interfaces of the branch three-way joint (332); and a plurality of air outlet holes are evenly distributed on the two terminal branch air pipes (333).

4. The integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding according to claim 3 is characterized in that: The air outlet is arranged toward the bottom wall inside the air chamber box (1).

5. The integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding according to claim 1 is characterized in that: It also comprises a high temperature resistant insulating gasket (4), wherein the high temperature resistant insulating gasket (4) is arranged between the arc voltage detection plate (2) and the gas chamber box (1).

6. The integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding according to claim 5 is characterized in that: It also includes an insulating screw (5), a first connecting hole is provided on the arc voltage detection plate (2), a second connecting hole is provided on the high temperature resistant insulating gasket (4), and a first threaded hole is provided on the air chamber box (1), and the insulating screw (5) is used to pass through the first connecting hole and the second connecting hole in sequence and be connected to the first threaded hole, so as to connect the arc voltage detection plate (2) and the high temperature resistant insulating gasket (4) to the air chamber box (1).

7. The integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding according to claim 1 is characterized in that: It also includes a height adjustment plate (6), which is connected to the outer wall of the air chamber box (1), and the height of the height adjustment plate (6) relative to the air chamber box (1) is adjustable in the vertical direction, so as to be used for adjusting the distance between the arc voltage detection plate (2) and the weld (71).

8. The integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding according to claim 7 is characterized in that: A second threaded hole (11) is provided on the outer wall of the air chamber box (1), and a long slot hole (61) is provided on the height adjustment plate (6). The second threaded hole (11) and the long slot hole (61) are used to be connected by screws so as to connect the height adjustment plate (6) to the air chamber box (1).

9. The integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding according to claim 1 is characterized in that: The arc voltage detection plate (2) is provided with a voltage detection lead interface (22).

10. The integrated device for collecting tail flame voltage and back gas protection of small hole plasma welding according to claim 1, characterized in that: A cooling water channel is provided inside the arc voltage detection plate (2).

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