A combined welding device and welding method for a tubular gas generator and a stud

Abstract

The present invention discloses a combined welding device and welding method for a tubular gas generator and a stud, including a frame for welding a tubular body and a stud. A three-jaw chuck for clamping the tubular body is arranged on the frame, and an inner support assembly and an outer support assembly are further included. The present invention relates to the technical field of gas generator welding. The first telescopic rod drives the top head to lift, so that the first inner support claw and the second inner support claw open outward, so that the first inner support claw abuts against the position on the inner wall surface of the tubular body opposite to the welding position, and the second inner support claw abuts against the position on the inner wall surface of the tubular body opposite to the upper clamping plate. Through cooperation with the outer support assembly, the deformation and displacement of the tubular body during the welding process are effectively prevented. By sucking gas through the suction pipe, the external gas passes through the first opening and cools the welding point of the stud and the tubular body, effectively reducing the heat accumulation during the welding process.

Description

Technical Field

[0001] The present invention relates to the technical field of gas generator welding, in particular to a tubular gas generator and stud combined welding device and a welding method. Background Art

[0002] At present, traditional welding equipment and methods are usually used to weld the tubular body and studs of tubular gas generators. The specific process includes grabbing the tubular body of the tubular gas generator with a mechanical claw and placing it on the welding machine, and then using a three-jaw chuck to clamp the tubular body. Next, the stud welder welds the first stud to the tubular body. After welding is completed, the pneumatic telescopic rod pushes the entire machine up so that the stud welder can weld the second stud to the tubular body. However, this traditional welding method has some problems. First, when the three-jaw chuck clamps the tubular body, due to the thin wall of the tube, a single clamping from the outside will cause deformation of the tubular body, resulting in deformation of the tubular body or change of the welding position during welding, affecting the welding quality. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the present invention provides a tubular gas generator and stud combination welding device, which solves the problem that the existing welding machine only uses a single three-jaw chuck to clamp the tubular body, resulting in deformation.

[0004] To achieve the above-mentioned objectives, the present invention is implemented through the following technical solutions: A tubular gas generator and stud combined welding device, comprising a frame for welding a tubular body and a stud, the frame being provided with a three-jaw chuck for clamping the tubular body, and further comprising an inner support assembly and an outer support assembly. The inner support assembly comprises a first support member and a second support member, the first support member extending into the tubular body and acting on the inner side of the weld between the stud and the tubular body, the second support member acting on the bottom of the tubular body and driving the tubular body to move up and down on the frame; the outer support assembly comprises a first clamping end and a second clamping end provided on the three-jaw chuck, the first clamping end being able to contact or move away from the tubular body, the second clamping end being able to contact the bottom end of the outer wall of the tubular body and following the tubular body to move up and down on the frame.

[0005] Preferably, the first support member includes a base arranged in the frame, a pin and a first inner support claw and a second inner support claw hinged to the base are provided on the top of the base, an elastic tightening ring is provided on the outside of the first inner support claw and the second inner support claw, and an inclined wall surface that contacts the pin is provided on the side walls of the first inner support claw and the second inner support claw, and a first telescopic rod connected to the pin is provided in the frame, and when the first telescopic rod drives the pin to lift upward, the first inner support claw and the second inner support claw open outward, so that the first inner support claw contacts the inner side of the weld between the stud and the tubular body, and the second inner support claw contacts the relative position on the tubular body where the first clamping end contacts.

[0006] Preferably, an air suction pipe is provided on the top, and a first opening and a second opening connected to the air suction pipe are respectively provided on the wall surfaces of the first inner support claw and the second inner support claw, the first opening includes a slot with an open top, and the second opening is a semicircular hole.

[0007] Preferably, the slot includes an upper opening, a diameter-reducing opening and a lower opening that are sequentially connected from top to bottom, the width of the upper opening is greater than the width of the lower opening, and the diameter-reducing opening corresponds to the welding point between the stud and the tubular body.

[0008] Preferably, the second support member comprises a sleeve arranged in the frame, a second telescopic rod is provided on one side of the sleeve, and a clamping ring for receiving the tubular body is circumferentially provided on the top of the sleeve.

[0009] Preferably, the top of the sleeve is provided with a plurality of inner support pieces that can be extended into the tubular body, the cross section of the inner support pieces is a continuously curved S-shape, and the top of the outer wall surface of the inner support pieces is a flat arm surface.

[0010] Preferably, an "L"-shaped side wall plate is provided on the outer wall of the first inner support claw and the second inner support claw, wherein, when the tubular body is seated on the sleeve, the side wall plate is engaged with the inner support sheet during the process of the first inner support claw and the second inner support claw being stretched outward, so that the planar arm surface contacts the inner wall of the tubular body.

[0011] Preferably, the first clamping end includes a third telescopic rod disposed above the three-jaw chuck, and an upper clamping plate is disposed at the output end of the third telescopic rod.

[0012] Preferably, a gap cavity is formed between the inner cavity at the top of the frame and the sleeve, and a sliding sleeve in contact with the sleeve is provided in the gap cavity;

[0013] The second clamping end includes a lower clamping plate that slides up and down below the three-jaw chuck. When the lower clamping plate slides downward, it is inserted into the gap cavity. A swing arm hinged to the lower clamping plate is connected to the outer wall of the three-jaw chuck. One side of the swing arm is connected to the three-jaw chuck through an elastic member.

[0014] The present invention provides a welding method, using any of the above-mentioned tubular gas generators and stud combined welding equipment, the welding method comprising the following steps:

[0015] S1. Place the tubular body to be welded on the clamping ring on the sleeve, clamp the upper clamping plate of the three-jaw chuck at a circumferential relative position of the first welding position of the tubular body, and clamp the lower clamping plate at the bottom of the tubular body;

[0016] S2. The first telescopic rod drives the top head to jack up, causing the first inner support claw and the second inner support claw to open outward, making the first inner support claw contact the position on the inner wall surface of the tubular body opposite to the welding position, and the second inner support claw contact the position on the inner wall surface of the tubular body opposite to the upper clamping plate;

[0017] S3. The suction pipe sucks gas, enabling the external gas to pass through the first opening and cooling the welding point between the stud and the tubular body; after the second opening contacts the inner wall surface of the tubular body, a negative pressure cavity is formed by suction, achieving the fixation of the tubular body;

[0018] S4. The stud welder carries the first stud and welds it at the first welding position of the tubular body;

[0019] S5. The third telescopic rod drives the upper clamping plate to retract, and the first telescopic rod descends to reset the first inner support claw and the second inner support claw inward; the second telescopic rod advances to drive the sleeve and the tubular body to descend, and the lower clamping plate slides downward following the descent of the tubular body;

[0020] S6. The third telescopic rod drives the upper clamping plate to advance, and repeats the steps of S2 and S3, and the stud welder carries the second stud and welds it at the second welding position of the tubular body;

[0021] S7. The third telescopic rod drives the upper clamping plate to retract, and the first telescopic rod descends to reset the first inner support claw and the second inner support claw inward; the second telescopic rod retracts to drive the sleeve and the tubular body to rise and reset; the welded tubular body is taken off.

[0022] Advantages of the present invention: By using a combined welding device and welding method for a tubular gas generator and a stud provided by the present invention, compared with the prior art, the first telescopic rod drives the top head to jack up, causing the first inner support claw and the second inner support claw to open outward, so that the first inner support claw contacts the position on the inner wall surface of the tubular body opposite to the welding position, and the second inner support claw contacts the position on the inner wall surface of the tubular body opposite to the upper clamping plate. Through the cooperation with the outer support assembly, this internal and external double-point clamping and fixing method effectively prevents the deformation and displacement of the tubular body during the welding process and improves the welding quality. Secondly, by sucking gas through the suction pipe, the external gas passes through the first opening and cools the welding point between the stud and the tubular body, effectively reducing the heat accumulation during the welding process, preventing local overheating of the tubular body, and prolonging its service life. In addition, after the second opening contacts the inner wall surface of the tubular body, a negative pressure cavity is formed by suction, further enhancing the fixing effect on the tubular body. Finally, by advancing the second telescopic rod to drive the sleeve and the tubular body to descend, the stud welder can carry the second stud and weld it at the second welding position of the tubular body. There is no need to drive the whole device to move up and down, improving the welding efficiency. Description of the Drawings

[0023] Figure 1This is the front view of the present invention;

[0024] Figure 2 This is the state diagram when the first stud of the present invention is welded;

[0025] Figure 3 This is the state diagram when the second stud of the present invention is welded;

[0026] Figure 4 This is the schematic structural diagram of the inner support piece of the present invention;

[0027] Figure 5 This is the present invention Figure 2 The enlarged structural schematic diagram at position A in;

[0028] Figure 6 This is the schematic structural diagram of the first inner support claw of the present invention;

[0029] Figure 7 This is the schematic structural diagram of the second inner support claw of the present invention;

[0030] Figure 8 This is the usage state diagram after the first inner support claw and the second inner support claw of the present invention are expanded outwards.

[0031] Explanation of the reference numerals in the figure:

[0032] 1, frame; 2, base; 3, first telescopic rod; 4, sleeve; 5, sliding sleeve; 6, second telescopic rod; 7, clearance cavity; 8, three-jaw chuck; 9, top head; 10, first inner support claw; 11, second inner support claw; 12, upper clamping plate; 13, third telescopic rod; 14, swing arm; 15, lower clamping plate; 16, snap ring; 17, flat arm surface; 18, inner support piece; 19, inclined wall surface; 20, suction pipe; 21, elastic member; 22, upper opening; 23, variable-diameter opening; 24, lower opening; 25, side wall plate; 26, semi-circular hole. Detailed implementation manners

[0033] For better explaining the present invention for easy understanding, the present invention will be described in detail below in conjunction with the drawings and through specific embodiments. The present invention discloses a combined welding device and welding method for a tubular gas generator and a stud. The first telescopic rod drives the top head to jack up, causing the first inner support claw and the second inner support claw to open outward. The first inner support claw abuts against the position on the inner wall surface of the tubular body opposite to the welding position, and the second inner support claw abuts against the position on the inner wall surface of the tubular body opposite to the upper clamping plate, and cooperates with the upper clamping plate and the lower clamping plate to form upper and lower double-point clamping and fixing of the inner and outer ends of the tubular body, effectively preventing the deformation and displacement of the tubular body during welding. The suction pipe sucks gas, enabling the external gas to pass through the first opening and cooling the welding point between the stud and the tubular body; after the second opening contacts the inner wall of the tubular body, it is sucked to form a negative pressure cavity, forming the fixation of the tubular body; the second telescopic rod advances to drive the sleeve and the tubular body to descend, and the stud welder welds the second stud on the second welding position of the tubular body.

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. As long as the effects of the present invention can be exerted, various changes can be made to the implementation solutions.

[0035] By those skilled in the art, the components in this case are connected in sequence. For the specific connection and operation sequence, reference should be made to the following working principle. The detailed connection means are well-known techniques in the art. The following mainly introduces the working principle and process.

[0036] As Figures 1 to 8 shown, the embodiment of the present application proposes a combined welding device for a tubular gas generator and a stud, including a frame 1 for welding the tubular body and the stud. A three-jaw chuck 8 for clamping the tubular body is provided on the frame 1. And, a stud welder is provided on the front side of the frame 1. The stud clamped by the stud welder is welded and fixed on the outer wall surface of the tubular body by means of arc welding.

[0037] It should be noted that the number of studs welded on the tubular body is 2, and they are welded and fixed symmetrically up and down on the outer wall surface of the tubular body.

[0038] Referring to Figure 1 and Figure 3 , in this embodiment, an inner support assembly and an outer support assembly are further included. Among them, the inner support assembly is used to receive the tubular body and support it on the inner wall of the tubular body; the outer support assembly is used to clamp the outer wall of the tubular body.

[0039] Specifically, the internal support assembly includes a first support member and a second support member. The first support member extends into the tubular body and acts on the inside of the weld between the stud and the tubular body, providing support for the stud welder during welding and securing the inner wall of the tubular body. The second support member acts on the bottom of the tubular body and drives the tubular body to move up and down on the frame 1, thereby adjusting the upper and lower positions of the two studs welded to the outer wall of the tubular body by the stud welder.

[0040] Furthermore, the first support member includes a base 2 disposed within the frame 1. A mandrel 9 and a first inner support claw 10 and a second inner support claw 11 hingedly connected to the base 2 are disposed on the top of the base 2. Elastic tightening rings are disposed on the outside of the first inner support claw 10 and the second inner support claw 11. The elastic tightening rings may be annular spring rings or rubber rings, so that the first inner support claw 10 and the second inner support claw 11 are tightened on both sides of the mandrel 9 under normal conditions. An inclined wall surface 19 is disposed on the side walls of the first inner support claw 10 and the second inner support claw 11, which contacts the mandrel 9. A first telescopic rod 3 connected to the mandrel 9 is disposed within the frame 1. The first telescopic rod 3 is preferably an electric telescopic rod. When the first telescopic rod 3 drives the ram 9 upward, the first and second inner support claws 10, 11 open outward, causing the first inner support claw 10 to contact the inside of the weld between the stud and the tubular body, and the second inner support claw 11 to contact the tubular body at the opposite position of the first clamping end, thereby supporting and securing the tubular body within the inner cavity. A central portion of the base 2 has a through-hole extending from front to back, and the first telescopic rod 3 is disposed within this cavity.

[0041] Furthermore, a suction pipe 20 is provided on the plug 9, and the suction pipe 20 is connected to a vacuum pump. A first opening and a second opening are respectively provided on the wall surfaces of the first inner support claw 10 and the second inner support claw 11, which are connected to the suction pipe 20. The first opening comprises a slot with an open top, and the second opening is a semicircular hole 26. After the first inner support claw 10 and the second inner support claw 11 are opened outward and abut against the inner wall of the tubular body, the vacuum pump operates to draw air between the first and second openings and the inner wall of the tubular body through the suction pipe 20, creating a vacuum between the second opening and the tubular body, forming an adsorption fixation. External air then enters the inner cavity along the top of the tubular body, and then passes through the first opening to cool the weld point between the stud and the tubular body, achieving a rapid cooling effect on the inside of the weld point.

[0042] Exemplarily, the slot includes an upper opening 22, a reducing opening 23 and a lower opening 24 connected in sequence from top to bottom. The width of the upper opening 22 is greater than the width of the lower opening 24. The reducing opening 23 corresponds to the welding point between the stud and the tubular body. When the gas passes through the reducing opening 23, the opening width is reduced due to the action of the reducing opening 23, the air flow speed is accelerated, and the welding point is directly impacted, thereby enhancing the cooling effect.

[0043] Specifically, the second support member includes a sleeve 4 disposed within the frame 1. A second telescopic rod 6 is provided on one side of the sleeve 4. A snap ring 16 for receiving the tubular body is circumferentially provided at the top of the sleeve 4. After the tubular body is placed on the sleeve 4, it is seated on the snap ring 16 to form position calibration for the tubular body.

[0044] Furthermore, a plurality of inner support pieces 18 that can extend into the tubular body are provided at the top of the sleeve 4. The cross-section of the inner support piece 18 is a continuously curved S shape, and the top of the outer wall surface of the inner support piece 18 is a flat arm surface 17. After the tubular body is seated on the snap ring 16, the inner support piece 18 is inserted into the interior of the tubular body, and its outer curved portion abuts against the inner wall of the tubular body to form expansion and fixation of the tubular body, so as to meet the stable effect of the tubular body when the sleeve 4 moves up and down.

[0045] In addition, "L"-shaped side wall plates 25 are provided on the outer walls of the first inner support claw 10 and the second inner support claw 11. Wherein, when the tubular body is seated on the sleeve 4, during the process of the first inner support claw 10 and the second inner support claw 11 expanding outwards, the side wall plates 25 are engaged with the inner support piece 18, so that the flat arm surface 17 abuts against the inner wall of the tubular body, increasing the contact surface between the inner support piece 18 and the inner wall of the tubular body, and improving the stable effect of the tubular body when the first stud is welded to the tubular body above the frame 1.

[0046] Specifically, the above-mentioned outer support assembly includes a first clamping end and a second clamping end provided on the three-jaw chuck 8. Among them, the first clamping end can abut against or move away from the tubular body, and is used to form clamping and fixation of the middle part of the outer wall of the tubular body, and disengages from the tubular body during the up and down movement of the tubular body. The second clamping end can abut against the bottom end of the outer wall of the tubular body and move up and down on the frame 1 following the tubular body, forming clamping and fixation of the upper and lower ends of the tubular body, and at the same time being able to perform clamping and fixation during the up and down movement of the tubular body, improving the stable effect of the tubular body.

[0047] Specifically, the first clamping end includes a third telescopic rod 13 provided above the three-jaw chuck 8. The output end of the third telescopic rod 13 is provided with an upper clamping plate 12. The third telescopic rod 13 is preferably an electric telescopic rod and is in an extended state under normal conditions. When the three-jaw chuck 8 advances for clamping, the upper clamping plate 12 clamps on the outer wall of the tubular body. When the tubular body descends or ascends, the third telescopic rod 13 retracts, driving the upper clamping plate 12 away from the tubular body.

[0048] It should be noted here that a clearance cavity 7 is formed between the inner cavity at the top of the frame 1 and the sleeve 4, and a sliding sleeve 5 in contact with the sleeve 4 is provided in the clearance cavity 7.

[0049] Specifically, the second clamping end includes a lower clamping plate 15 that slides up and down below the three-jaw chuck 8. When the lower clamping plate 15 slides to the bottom, it is inserted into the gap cavity 7. A swing arm 14 hinged to the lower clamping plate 15 is connected to the outer wall of the three-jaw chuck 8. One side of the swing arm 14 is connected to the three-jaw chuck 8 through an elastic member 21, and the elastic member 21 is a spring.

[0050] When the three-jaw chuck 8 is pushed forward to clamp, the lower clamping plate 15 contacts the lower end of the tubular body. When welding the first stud, the lower clamping plate 15 and the inner support plate 18 are clamped inside and outside under the tubular body. When welding the second stud, the lower clamping plate 15 descends with the tubular body and is still clamped under the tubular body to ensure the stability of the tubular body during movement.

[0051] In addition, the swing arm 14 is a pneumatic telescopic rod to adapt to the position change of the lower clamping plate 15 when it slides up and down, and the reverse thrust of the telescopic end of the pneumatic telescopic rod when it is compressed can also act on the lower clamping plate 15 to prevent the tubular body from falling or shifting in position.

[0052] This embodiment also provides a welding method, using the above-mentioned tubular gas generator and stud combined welding equipment, the welding method comprising the following steps:

[0053] S1, such as Figure 2 As shown, the tubular body to be welded is placed on the clamping ring 16 on the sleeve 4, the upper clamping plate 12 of the three-jaw chuck 8 is clamped at a circumferential relative position of the first welding position of the tubular body, and the lower clamping plate 15 is clamped at the bottom of the tubular body;

[0054] S2, the first telescopic rod 3 drives the jack 9 to lift and open the first inner support claw 10 and the second inner support claw 11 outward, so that the first inner support claw 10 abuts against the inner wall of the tubular body at a position opposite to the welding position, and the second inner support claw 11 abuts against the inner wall of the tubular body at a position opposite to the upper clamping plate 12;

[0055] S3, the air suction pipe 20 draws air, allowing the external air to pass through the first opening and cool the welding point between the stud and the tubular body; the second opening contacts the inner wall of the tubular body and is sucked to form a negative pressure cavity, thereby fixing the tubular body;

[0056] S4, the stud welding machine carries the first stud and welds it to the first welding position of the tubular body;

[0057] S5, such as Figure 3 As shown, the third telescopic rod 13 drives the upper clamping plate 12 to retract, and the first telescopic rod 3 descends to reset the first inner supporting claw 10 and the second inner supporting claw 11 inward; the second telescopic rod 6 advances to drive the sleeve 4 and the tubular body to descend, and the lower clamping plate 15 slides downward to follow the tubular body.

[0058] S6. The third telescopic rod 13 drives the upper clamping plate 12 to advance, and repeats the steps of S2 and S3, and the stud welder carries the second stud to weld at the second welding position of the tubular body;

[0059] S7. The third telescopic rod 13 drives the upper clamping plate 12 to retract, the first telescopic rod 3 descends to reset the first inner support claw 10 and the second inner support claw 11 inward; the second telescopic rod 6 retracts to drive the sleeve 4 and the tubular body to rise and reset; the welded tubular body is taken off.

[0060] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined welding device for a tubular gas generator and a stud, comprising a frame for welding a tubular body and a stud, wherein a three-jaw chuck for clamping the tubular body is arranged on the frame, and is characterized in that, Also includes: An inner support assembly includes a first support member and a second support member, wherein the first support member extends into the tubular body and acts on the inner side of the weld between the stud and the tubular body, and the second support member acts on the bottom of the tubular body and drives the tubular body to move up and down on the frame; An outer support assembly includes a first clamping end and a second clamping end provided on the three-jaw chuck, wherein the first clamping end can abut against or move away from the tubular body, and the second clamping end can abut against the bottom end of the outer wall of the tubular body and move up and down with the tubular body on the frame; The first support member includes a base arranged in the frame, a top of the base is provided with a plug and a first inner support claw and a second inner support claw hinged to the base, an elastic tightening ring is provided on the outer side of the first inner support claw and the second inner support claw, and an inclined wall surface that contacts the plug is provided on the side wall of the first inner support claw and the second inner support claw, a first telescopic rod connected to the plug is provided in the frame, and when the first telescopic rod drives the plug to jack up, the first inner support claw and the second inner support claw open outward, so that the first inner support claw contacts the inner side of the weld between the stud and the tubular body, and the second inner support claw contacts the relative position where the first clamping end contacts the tubular body; The mandrel is provided with an air suction pipe, and the walls of the first inner support claw and the second inner support claw are respectively provided with a first opening and a second opening connected to the air suction pipe, the first opening comprising a slot with an open top, and the second opening being a semicircular hole; The slot includes an upper opening, a diameter-reducing opening and a lower opening which are sequentially connected from top to bottom. The width of the upper opening is greater than that of the lower opening. The diameter-reducing opening corresponds to the welding position of the stud and the tubular body.

2. The combined welding equipment for a tubular gas generator and a stud according to claim 1, characterized in that: The second supporting member includes a sleeve arranged in the frame, a second telescopic rod is arranged on one side of the sleeve, and a clamping ring for receiving the tubular body is circumferentially arranged on the top of the sleeve.

3. The combined welding equipment for a tubular gas generator and a stud according to claim 2, characterized in that: The top of the sleeve is provided with a plurality of inner support pieces which can be extended into the tubular body. The cross section of the inner support pieces is a continuously curved S-shape, and the top of the outer wall of the inner support pieces is a plane wall.

4. A combined welding device for a tubular gas generator and a stud according to claim 3, characterized in that: An "L"-shaped side wall plate is provided on the outer wall of the first inner support claw and the second inner support claw, wherein, when the tubular body is seated on the sleeve, the side wall plate is engaged with the inner support sheet during the process of the first inner support claw and the second inner support claw being stretched outward, so that the planar wall surface contacts the inner wall of the tubular body.

5. A combined welding device for a tubular gas generator and a stud according to claim 1, characterized in that: The first clamping end includes a third telescopic rod disposed above a three-jaw chuck, and an upper clamping plate is disposed at an output end of the third telescopic rod.

6. The combined welding equipment for a tubular gas generator and a stud according to claim 1, characterized in that: A gap cavity is formed between the inner cavity at the top of the frame and the sleeve, and a sliding sleeve in contact with the sleeve is provided in the gap cavity; The second clamping end includes a lower clamping plate that slides up and down below the three-jaw chuck. When the lower clamping plate slides downward, it is inserted into the gap cavity. A swing arm hinged to the lower clamping plate is connected to the outer wall of the three-jaw chuck. One side of the swing arm is connected to the three-jaw chuck through an elastic member.

7. A welding method, characterized in that: Using the tubular gas generator and stud combined welding device according to any one of claims 1 to 6, the welding method comprises the following steps: S1. Place the tubular body to be welded at the snap ring on the sleeve. The upper clamping plate of the three-jaw chuck clamps the circumferential relative position of the first welding position of the tubular body, and the lower clamping plate clamps the bottom of the tubular body. S2. The first telescopic rod drives the top head to jack up, causing the first inner support claw and the second inner support claw to open outward, so that the first inner support claw abuts against the position on the inner wall surface of the tubular body opposite to the welding position, and the second inner support claw abuts against the position on the inner wall surface of the tubular body opposite to the upper clamping plate. S3. The suction pipe sucks gas, so that the external gas passes through the first opening and cools the welding point of the stud and the tubular body; after the second opening contacts the inner wall surface of the tubular body, it is sucked to form a negative pressure cavity, forming a fixation for the tubular body. S4. The stud welder carries the first stud and welds it at the first welding position of the tubular body. S5. The third telescopic rod drives the upper clamping plate to retract, and the first telescopic rod descends to reset the first inner support claw and the second inner support claw inward; the second telescopic rod advances to drive the sleeve and the tubular body to descend, and the lower clamping plate slides downward following the descent of the tubular body. S6. The third telescopic rod drives the upper clamping plate to advance, and repeat the steps of S2 and S3, and the stud welder carries the second stud and welds it at the second welding position of the tubular body. S7. The third telescopic rod drives the upper clamping plate to retract, and the first telescopic rod descends to reset the first inner support claw and the second inner support claw inward; the second telescopic rod retracts to drive the sleeve and the tubular body to rise and reset; remove the welded tubular body.

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