A circumferential seam welding machine for preventing corrugated pipes from curling

Abstract

The present invention discloses a circumferential seam welding machine for preventing corrugated pipes from curling, which relates to the technical field of welding machines and includes a frame. A table board is fixedly welded to the top of the frame. A rotary mechanism is fixedly installed on the upper surface of the table board. A welding chamber is fixedly installed on the top of the rotary mechanism. A welding torch fine-tuning mechanism is fixedly installed on the upper surface of the table board. The welding torch fine-tuning mechanism includes a translation device, and a positioning device is arranged on the front surface of the translation device. A pressing mechanism is fixedly installed on the upper surface of the table board. In the present invention, a stepping motor is used to drive the welding torch to rotate, and the corrugated pipe is fixed in the middle by a cylinder clamp. Relative to the welding machine, the corrugated pipe and the connecting joint are fixed, and the welding torch welds a 360-degree circle at a fixed distance around the circumferential weld to be welded, so as to obtain the required circumferential weld, solve the problem of curling of long corrugated pipes, thus solve the difficult problem of welding long corrugated pipes, and reduce the operation skill requirements for operators.

Description

Technical Field

[0001] The present invention relates to the technical field of welding machines, and in particular to a circumferential seam welding machine for preventing corrugated pipes from curling up. Background Art

[0002] A circumferential seam welding machine is a general-purpose automatic welding device that can complete various circular and annular welds. When connecting other pipes or valves with a corrugated pipe for gas, a joint for connection needs to be welded at the connecting end of the corrugated pipe.

[0003] The Chinese patent document with the publication number CN102974914B discloses a circumferential seam welding machine for corrugated pipes, which records that "it includes a bracket, and further includes a welding torch moving mechanism connected to the upper part of the bracket for driving the welding torch to move and a work piece rotating mechanism connected to the lower part of the bracket for driving the work piece to rotate. The welding torch moving mechanism moves relative to the bracket to adjust the welding position, and the work piece rotating mechanism drives the work piece to continuously rotate during the welding process so that the welding material forms an annular weld on the work piece". This circumferential seam welding machine for corrugated pipes can accurately control the welding position, improve the welding quality, simplify the welding operation, and has a high degree of automation.

[0004] The Chinese patent document with the publication number CN209477561U discloses a circumferential seam welding machine for corrugated pipes, which records that "it includes a machine body, a workbench is arranged on the upper surface of the machine body, a support plate is arranged on the upper surface of the workbench, a support frame is arranged on the upper surface of the support plate, a hydraulic cylinder is arranged on the upper surface of the support frame, a hydraulic telescopic rod is arranged on the outer wall of the hydraulic cylinder, a welding torch is arranged at one end of the hydraulic telescopic rod, an adjustment knob is arranged at one end of the welding torch, a handle is arranged on one side of the adjustment knob, a trigger is arranged on the outer wall of the handle, a welding nozzle is arranged at the other end of the welding torch, a servo motor is arranged on one side of the support frame, a fixing member is arranged on one side of the servo motor, a fixing plate is arranged inside the fixing member, and a fixing groove is arranged inside the fixing plate". This device plays a role in holding the corrugated pipe through the provided holding cylinder, thus effectively avoiding the problem of dislocation of the corrugated pipe during circumferential seam welding.

[0005] However, the above methods all use a welding positioner to clamp the pipe, drive the rotation of the pipe through a motor, and the welding torch is fixed on the base and positioned at the weld by a cylinder. Ignite and use the material of the connecting pipe itself to self-fuse and connect to the pre-processed welding surface of the corrugated pipe. After rotating one circle, the arc is extinguished, and thus an annular seam is formed, and the required connecting joint of the corrugated pipe is welded on. However, the lengths of gas connection pipes vary. The transmission method used by the welding equipment is to rotate the pipe for welding. This poses no problem for some short pipes, but for long pipes, the resistance to rotating the pipe is very large, sometimes affecting the welding quality, adding a certain amount of torsion to the pipe itself, and requiring too high operating skills from the operator. Summary of the Invention

[0006] The object of the present invention is to solve the deficiencies existing in the prior art, and to propose a circumferential seam welding machine that avoids the curling of corrugated pipes.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A circumferential seam welding machine that avoids the curling of corrugated pipes, including a frame. A table board is fixedly welded to the top of the frame. A rotary mechanism is fixedly installed on the upper surface of the table board. A welding chamber is fixedly installed on the top of the rotary mechanism. A welding torch fine-tuning mechanism is fixedly installed on the upper surface of the table board. The welding torch fine-tuning mechanism includes a translation device. A positioning device is arranged on the front surface of the translation device. A pressing mechanism is fixedly installed on the upper surface of the table board. An argon arc welding machine is arranged inside the frame. A pneumatic system is arranged inside the frame. An electrical system is fixedly installed inside the frame. A mercury slip ring is fixedly installed inside the frame. A plurality of fluid slip rings are arranged on the top of the mercury slip ring.

[0009] Preferably, the rotary mechanism includes a stepping motor. The output end of the stepping motor is fixedly connected with an output shaft. A gear is fixedly sleeved on the output shaft of the stepping motor. The gear meshes with a slewing bearing. The outer ring of the slewing bearing is fixedly connected with a rotary panel through screws. The inner ring of the slewing bearing is fixedly connected with the table board through screws. When the stepping motor is started, the stepping motor drives the gear to rotate through the output shaft, and the gear drives the rotary panel to rotate through the slewing bearing.

[0010] Preferably, the translation device includes a translation base. The translation base is fixedly connected with the upper surface of the rotary panel. A lead screw is rotatably connected to the outer wall of the translation base. A moving seat is threadedly connected to the outer wall of the lead screw. The top end of the lead screw is fixedly connected with a turning handle. When the turning handle is manually rotated, the turning handle drives the lead screw to rotate, and the lead screw can drive the moving seat to move up and down.

[0011] Preferably, the positioning device includes a slide table. A first cylinder is fixedly installed on one outer wall of the slide table. The output end of the first cylinder is fixedly connected with a mounting seat. A slide rail is fixedly installed on the outer wall of the slide table. The slide rail is slidably connected with the mounting seat. When the first cylinder is started, the first cylinder drives the mounting seat to move.

[0012] Preferably, the argon arc welding machine includes a welding torch. The welding torch is fixedly connected with the mounting seat. When the mounting seat moves horizontally, it can drive the welding torch to move horizontally. The welding torch is positioned at the weld of the corrugated pipe through the first cylinder. The moving seat is fixedly connected with the back outer wall of the slide table. The moving seat can drive the slide table to move up and down, so as to adjust the height of the welding torch, and thus the height of the welding torch can be finely adjusted according to the position of the weld.

[0013] Preferably, the pressing mechanism includes a support frame fixedly connected to the upper surface of the table board. A second cylinder is fixedly installed at the top of the support frame, and the output end of the second cylinder is fixedly connected to a cylinder clamp. The cylinder clamp is located directly above the welding chamber. When the cylinder clamp is started, the bellows is clamped by the cylinder clamp to fix the bellows. Then the second cylinder is started, and the second cylinder drives the cylinder clamp to move downward. The cylinder clamp drives the bellows to move downward. Since the bellows has a certain elasticity, the bellows applies pressure to the surface of the connection joint, making the bellows fit tightly with the connection joint.

[0014] Preferably, the welding chamber includes a base fixedly connected to the rotary panel by screws at the bottom. The base is located in the middle of the rotary panel. A cylinder is welded on the upper surface of the base. A first opening is provided on one side wall of the cylinder. An observation window is fixedly installed on the other side of the cylinder. A positioning seat is rotatably connected inside the cylinder. A second opening is provided at the top of the cylinder. The input end at the bottom of the cylinder is fixedly connected to an intake pipe, and the other end of the intake pipe is connected to a fluid slip ring. The other end of the fluid slip ring is connected to a gas tank that supplies inert gas. The connection joint is placed into the cylinder through the second opening, and the positioning seat is sleeved with the connection joint. Then the bellows is inserted into the cylinder through the second opening, and the bellows is sleeved with the positioning seat. The end of the bellows is in contact with the connection joint. The positioning seat is used to keep the bellows and the connection joint concentric, so that the central axes of the bellows and the connection joint are on the same straight line.

[0015] Preferably, the first opening and the welding torch are on the same side and correspond to each other. The argon arc welding machine, the welding torch and the mercury slip ring are electrically connected.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. In the present invention, a stepping motor is used to drive the welding torch to rotate, and the bellows is fixed in the middle by a cylinder clamp. Relative to the welding machine, the bellows and the connection joint are fixed, and the welding torch welds a 360-degree circle at a fixed distance around the circumferential weld that needs to be welded, so as to obtain the required circumferential weld, solve the problem of long bellows curling, thus solve the difficult problem of welding long bellows, and reduce the operation skill requirements for operators.

[0018] 2. In the present invention, through the design of the welding chamber, a certain amount of inert gas is introduced into the welding chamber to form a closed welding chamber, which protects the weld bead during welding from being oxidized and reduces the risk of weld leakage.

[0019] 3. In the present invention, the second cylinder drives the cylinder fixture to move downward, and the cylinder fixture drives the bellows to move downward. Since the bellows has a certain elasticity, the bellows applies pressure to the surface of the connection joint, making the bellows fit tightly with the connection joint, further reducing the risk of weld leakage.

[0020] 4. In the present invention, when the mounting base moves horizontally, the mounting base can drive the welding torch to move horizontally. The first cylinder positions the welding torch at the weld of the bellows. At the same time, the moving base can drive the slide table to move up and down, thereby adjusting the height of the welding torch, so that the height of the welding torch can be finely adjusted according to the position of the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the front view of a circumferential seam welding machine for avoiding bellows curling according to the present invention.

[0022] Figure 2 It is the side view of a circumferential seam welding machine for avoiding bellows curling according to the present invention.

[0023] Figure 3 It is the structural schematic diagram of the slewing mechanism of a circumferential seam welding machine for avoiding bellows curling according to the present invention.

[0024] Figure 4 It is the structural schematic diagram of the slewing bearing of a circumferential seam welding machine for avoiding bellows curling according to the present invention.

[0025] Figure 5 It is the structural schematic diagram of the welding torch fine-tuning mechanism of a circumferential seam welding machine for avoiding bellows curling according to the present invention.

[0026] Figure 6 It is the structural schematic diagram of the translation device of a circumferential seam welding machine for avoiding bellows curling according to the present invention.

[0027] Figure 7 It is the structural schematic diagram of the positioning device of a circumferential seam welding machine for avoiding bellows curling according to the present invention.

[0028] Figure 8 It is the structural schematic diagram of the welding torch of a circumferential seam welding machine for avoiding bellows curling according to the present invention.

[0029] Figure 9 It is the structural schematic diagram of the pressing mechanism of a circumferential seam welding machine for avoiding bellows curling according to the present invention.

[0030] Figure 10 It is the structural schematic diagram of the welding chamber of a circumferential seam welding machine for avoiding bellows curling according to the present invention.

[0031] Reference numerals in the figures: 1, frame; 2, table top panel; 3, slewing mechanism; 301, stepper motor; 302, gear; 303, slewing bearing; 304, slewing panel; 4, welding torch fine-tuning mechanism; 401, translation device; 40101, translation base; 40102, lead screw; 40103, moving base; 40104, turning handle; 402, positioning device; 40201, sliding table; 40202, first cylinder; 40203, slide rail; 40204, mounting base; 5, clamping mechanism; 501, support frame; 502, second cylinder; 503, cylinder fixture; 6, electrical system; 7, argon arc welding machine; 701, welding torch; 8, welding chamber; 801, base; 802, cylinder; 803, first opening; 804, observation window; 805, positioning seat; 806, second opening; 807, intake pipe; 9, pneumatic system; 10, mercury slip ring; 11, fluid slip ring. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying 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.

[0033] Embodiment:

[0034] As shown in the attached Figure 1 to the attached Figure 10 figures:

[0035] A circumferential seam welding machine for avoiding bellows curling includes a frame 1. A table top panel 2 is fixedly welded to the top of the frame 1. A slewing mechanism 3 is fixedly installed on the upper surface of the table top panel 2. A welding chamber 8 is fixedly installed on the top of the slewing mechanism 3. A welding torch fine-tuning mechanism 4 is fixedly installed on the upper surface of the table top panel 2. The welding torch fine-tuning mechanism 4 includes a translation device 401. A positioning device 402 is arranged on the front surface of the translation device 401. A clamping mechanism 5 is fixedly installed on the upper surface of the table top panel 2. An argon arc welding machine 7 is arranged inside the frame 1. A pneumatic system 9 is arranged inside the frame 1. An electrical system 6 is fixedly installed inside the frame 1. A mercury slip ring 10 is fixedly installed inside the frame 1. A plurality of fluid slip rings 11 are arranged on the top of the mercury slip ring 10.

[0036] Please refer to Figure 3-4 , the slewing mechanism 3 includes a stepper motor 301. The output end of the stepper motor 301 is fixedly connected to an output shaft. The output shaft of the stepper motor 301 is fixedly sleeved with a gear 302. The gear 302 meshes with a slewing bearing 303. The outer ring of the slewing bearing 303 is fixedly connected with a slewing panel 304 by screws. The inner ring of the slewing bearing 303 is fixedly connected with the table top panel 2 by screws. When the stepper motor 301 is started, the stepper motor 301 drives the gear 302 to rotate through the output shaft, and the gear 302 drives the slewing panel 304 to rotate through the slewing bearing 303.

[0037] Please refer to Figure 5-6 Figure 5-6 , the translation device 401 includes a translation base 40101, the translation base 40101 is fixedly connected to the upper surface of the rotary panel 304, the outer wall of the translation base 40101 is rotatably connected to a lead screw 40102, the outer wall of the lead screw 40102 is threadedly connected to a moving base 40103, the top end of the lead screw 40102 is fixedly connected to a turning handle 40104. Manually rotate the turning handle 40104, the turning handle 40104 drives the lead screw 40102 to rotate, and the lead screw 40102 can drive the moving base 40103 to move up and down.

[0038] Please refer to Figure 7 Figure 7 , the positioning device 402 includes a sliding table 40201, a first cylinder 40202 is fixedly installed on one outer wall of the sliding table 40201, the output end of the first cylinder 40202 is fixedly connected to a mounting seat 40204, a slide rail 40203 is fixedly installed on the outer wall of the sliding table 40201, and the slide rail 40203 is slidably connected to the mounting seat 40204. Start the first cylinder 40202, and the first cylinder 40202 drives the mounting seat 40204 to move.

[0039] Please refer to Figure 5-7 Figure 5-7 , the argon arc welder 7 includes a welding torch 701, the welding torch 701 is fixedly connected to the mounting seat 40204. When the mounting seat 40204 moves horizontally, it can drive the welding torch 701 to move horizontally. The welding torch 701 is positioned at the weld of the bellows through the first cylinder 40202. The moving base 40103 is fixedly connected to the back outer wall of the sliding table 40201, and the moving base 40103 can drive the sliding table 40201 to move up and down, so as to adjust the height of the welding torch 701, and thus the height of the welding torch 701 can be finely adjusted according to the position of the weld.

[0040] Please refer to Figure 9 Figure 9 , the pressing mechanism 5 includes a support frame 501, the support frame 501 is fixedly connected to the upper surface of the table panel 2, a second cylinder 502 is fixedly installed at the top of the support frame 501, the output end of the second cylinder 502 is fixedly connected to a cylinder clamp 503, and the cylinder clamp 503 is located directly above the welding chamber 8. Start the cylinder clamp 503, and the bellows is clamped through the cylinder clamp 503, so as to fix the bellows. Start the second cylinder 502, the second cylinder 502 drives the cylinder clamp 503 to move downward, and the cylinder clamp 503 drives the bellows to move downward. Since the bellows has a certain elasticity, the bellows applies pressure to the surface of the connection joint, so that the bellows is closely attached to the connection joint.

[0041] Please refer to Figure 10, the welding chamber 8 includes a base 801. The bottom of the base 801 is fixedly connected to the rotary panel 304 by screws. The base 801 is located in the middle of the rotary panel 304. A cylinder 802 is welded on the upper surface of the base 801. A first opening 803 is provided on one side wall of the cylinder 802. An observation window 804 is fixedly installed on the other side of the cylinder 802. A positioning seat 805 is rotatably connected inside the cylinder 802. A second opening 806 is provided at the top of the cylinder 802. The bottom input end of the cylinder 802 is fixedly connected to an air inlet pipe 807. The other end of the air inlet pipe 807 is connected to the fluid slip ring 11. The other end of the fluid slip ring 11 is connected to a gas tank for introducing inert gas. The connection joint is placed into the cylinder 802 through the second opening 806, and the positioning seat 805 and the connection joint are sleeved with each other. Then, the bellows is inserted into the cylinder 802 through the second opening 806. The bellows and the positioning seat 805 are sleeved with each other. The port of the bellows is in contact with the connection joint. The positioning seat 805 is used to keep the bellows and the connection joint concentric, so that the central axes of the bellows and the connection joint are on the same straight line.

[0042] Please refer to Figure 1-10 , the first opening 803 and the welding torch 701 are on the same side and correspond to each other. The argon arc welder 7, the welding torch 701 and the mercury slip ring 10 are electrically connected.

[0043] In the present invention, it should be understood that the pneumatic system 9 includes an air compressor, an air storage tank, an air purification device, and an output pipeline. The air compressor is the power source of the pneumatic system 9. The air storage tank is used for stabilizing pressure and storing air. The air purification device filters impurities in the compressed air. The output pipeline is used for transporting gas. The output end of the output pipeline is connected to the intake ports of 602 and 603. The input end of the output pipeline is connected to the fluid slip ring 11. The output end of the fluid slip ring 11 is connected to the intake port of the first cylinder 40202 through an output pipeline. Control valves are installed on each output pipeline. The control valves are used for controlling the direction of the compressed air. The electrical system 6 provides working power for the stepper motor 301 and the argon arc welder 7. At the same time, the electrical components appearing in the text are all electrically connected to the external main controller and the 220V mains power supply, and the main controller can be a conventional known device such as a computer for control.

[0044] The specific usage mode and function of this embodiment:

[0045] When the present invention is in use, first, the connection joint is placed into the cylinder 802 through the second opening 806, and the positioning seat 805 is sleeved with the connection joint. Then, the bellows is inserted into the cylinder 802 through the second opening 806. The bellows is sleeved with the positioning seat 805, and the port of the bellows is in contact with the connection joint. The positioning seat 805 is used to keep the bellows and the connection joint concentric, so that the central axes of the bellows and the connection joint are on the same straight line. Start the cylinder clamp 503, and clamp the bellows through the cylinder clamp 503, thereby fixing the bellows. Start the second cylinder 502, and the second cylinder 502 drives the cylinder clamp 503 to move downward. The cylinder clamp 503 drives the bellows to move downward. Since the bellows has a certain elasticity, the bellows applies pressure to the surface of the connection joint, so that the bellows and the connection joint are closely attached;

[0046] Pass inert gas argon into the cylinder 802 through the inlet pipe 807 to protect the weld bead during welding from being oxidized. Start the first cylinder 40202, and the first cylinder 40202 drives the mounting seat 40204 to move. The mounting seat 40204 drives the welding torch 701 to move. The welding torch 701 is inserted into the cylinder 802 through the first opening 803. Position the welding torch 701 at the weld of the bellows through the first cylinder 40202. Start the stepping motor 301, and the stepping motor 301 drives the gear 302 to rotate through the output shaft. The gear 302 drives the rotary panel 304 to rotate through the slewing bearing 303. The rotary panel 304 drives the cylinder 802 and the welding torch 701 on its upper surface to rotate. Relative to the device, the bellows, the connection joint and the positioning seat 805 are fixed. At this time, the welding torch 701 rotates one circle along the weld of the bellows, so as to obtain the required circumferential weld and solve the problem of curling of the long bellows.

[0047] Please refer to the above structure and process Figure 1-10 。

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined.

[0050] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A circumferential seam welding machine for preventing corrugated pipes from curling, comprising a frame (1), characterized in that, The top of the frame (1) is fixedly welded with a table board (2). The upper surface of the table board (2) is fixedly installed with a slewing mechanism (3). The top of the slewing mechanism (3) is fixedly installed with a welding chamber (8). The upper surface of the table board (2) is fixedly installed with a welding torch fine-tuning mechanism (4). The welding torch fine-tuning mechanism (4) includes a translation device (401). A positioning device (402) is arranged on the front surface of the translation device (401). The upper surface of the table board (2) is fixedly installed with a pressing mechanism (5). An argon arc welder (7) is arranged inside the frame (1). A pneumatic system (9) is arranged inside the frame (1). An electrical system (6) is fixedly installed inside the frame (1). A mercury slip ring (10) is fixedly installed inside the frame (1). A plurality of fluid slip rings (11) are arranged on the top of the mercury slip ring (10); The slewing mechanism (3) includes a stepping motor (301). The output end of the stepping motor (301) is fixedly connected with an output shaft. The output shaft of the stepping motor (301) is fixedly sleeved with a gear (302). The gear (302) meshes with a slewing bearing (303). The outer ring of the slewing bearing (303) is fixedly connected with a slewing panel (304) by screws. The inner ring of the slewing bearing (303) is fixedly connected with the table board (2) by screws; The translation device (401) includes a translation base (40101). The translation base (40101) is fixedly connected with the upper surface of the slewing panel (304). The outer wall of the translation base (40101) is rotatably connected with a lead screw (40102). The outer wall of the lead screw (40102) is threadedly connected with a moving base (40103). The top end of the lead screw (40102) is fixedly connected with a turning handle (40104); The welding chamber (8) includes a base (801). The bottom of the base (801) is fixedly connected with the slewing panel (304) by screws. The base (801) is located in the middle of the slewing panel (304). A cylinder (802) is welded on the upper surface of the base (801). A first opening (803) is formed in one side wall of the cylinder (802). An observation window (804) is fixedly installed on the other side of the cylinder (802). A positioning seat (805) is rotatably connected inside the cylinder (802). A second opening (806) is formed in the top of the cylinder (802). An air inlet pipe (807) is fixedly connected to the bottom input end of the cylinder (802). The other end of the air inlet pipe (807) is connected with the fluid slip ring (11).

2. The circumferential seam welding machine for avoiding the curling of the corrugated pipe according to claim 1, characterized in that, The positioning device (402) includes a slide table (40201). A first cylinder (40202) is fixedly installed on one outer wall of the slide table (40201). The output end of the first cylinder (40202) is fixedly connected with a mounting seat (40204). A slide rail (40203) is fixedly installed on the outer wall of the slide table (40201). The slide rail (40203) is slidably connected with the mounting seat (40204).

3. The circumferential seam welding machine for avoiding the curling of the corrugated pipe according to claim 2, characterized in that, The argon arc welding machine (7) includes a welding torch (701), the welding torch (701) is fixedly connected to a mounting base (40204), and the moving base (40103) is fixedly connected to the outer wall of the back of the sliding table (40201).

4. A circumferential seam welding machine for preventing corrugated pipes from curling, characterized in that, The pressing mechanism (5) includes a support frame (501), the support frame (501) is fixedly connected to the upper surface of the table board (2), a second cylinder (502) is fixedly installed at the top of the support frame (501), the output end of the second cylinder (502) is fixedly connected to a cylinder clamp (503), and the cylinder clamp (503) is located directly above the welding chamber (8).

5. The circumferential seam welding machine for preventing corrugated pipes from curling according to claim 3, wherein The cylinder (802) is on the same side as the welding torch (701) and corresponds to each other, and the welding torch (701) is electrically connected to a mercury slip ring (10).

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