Welding device and application thereof in multi-layer and multi-pass welding process

Abstract

The invention discloses a welding device and application thereof in a multi-layer and multi-pass welding process, and relates to the technical field of welding, the welding device comprises a welding gun body, an auxiliary block is fixedly connected to the welding gun body, a knocking mechanism is arranged on the auxiliary block in a sliding mode, the knocking mechanism comprises a knocking rod connected with the auxiliary block in a sliding mode, and the knocking rod is connected with the welding gun body in a sliding mode. One end of the knocking rod extends out of the auxiliary block and is fixedly connected with a knocking head, the slag removing mechanism is arranged on the auxiliary block in a sliding mode, the slag removing mechanism comprises a supporting block connected with the auxiliary block in a sliding mode, a metal brush is fixedly connected to the supporting block, a suction groove is formed in the supporting block, and the metal brush is fixedly connected with the suction groove. A suction groove is formed in the supporting block, one opening of the suction groove faces the metal brush, a collecting cavity is formed in the supporting block, the other opening of the suction groove communicates with the collecting cavity, and the adjusting mechanism is arranged between the knocking mechanism and the slag removing mechanism in a hinged mode; the device can automatically clean and collect residues on a welding seam.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a welding device and application thereof in a multi-layer and multi-pass welding process. Background Art

[0002] With the accelerated pace of production in industrial enterprises, new requirements are put forward for pipelines. The diameter of pipelines is getting larger and larger, and the pressure of the conveying medium is getting higher and higher. Therefore, higher requirements are put forward for the quality and technology of pipeline welding. At present, most industrial enterprises still use manual welding technology, which has low welding efficiency and is greatly affected by human factors. Welding defects often occur, which will affect the quality and safety of the entire project. Rework to eliminate defects also reduces the overall operation efficiency. Automatic welding technology came into being.

[0003] Nowadays, the specific form usually adopted for automatic pipeline welding is: after beveling two sections of pipeline to be welded, they are aligned and fixed with a certain gap, and then a welding robot (or automatic welding machine) that can move along the circumferential direction of the pipeline is fixed on the pipeline, so that the welding robot can perform filler welding on the gap between the two pipelines. However, generally only one weld is performed, resulting in different load-bearing capacities of the weld. In order to improve the welding quality and negative pressure, multi-layer and multi-pass welding methods are generally used for welding, and after each layer of welding is completed, the weld surface needs to be cleaned to ensure the quality of the weld surface. However, the slag is generally cleaned manually, which is inefficient, and the residue cannot be collected and the weld surface cannot be cleaned during the slag cleaning process, resulting in poor weld surface quality, which is easy to affect the welding quality in the next welding, resulting in pores and cracks between weld layers, thereby reducing the welding quality.

[0004] Therefore, a welding device and its application in multi-layer multi-pass welding process are invented to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a welding device and its application in a multi-layer and multi-pass welding process, which can effectively solve the technical problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a welding device, comprising a welding gun body, to which an auxiliary block is fixedly connected; A knocking mechanism, which is slidably disposed on the auxiliary block and is used to knock the residue on the weld, and the knocking mechanism includes a knocking rod slidably connected to the auxiliary block; A slag cleaning mechanism, wherein the slag cleaning mechanism is slidably arranged on the auxiliary block, the slag cleaning mechanism comprises a support block slidably connected to the auxiliary block, a metal brush is fixedly connected to the support block, and a suction groove is provided on the support block; The adjusting mechanism is hingedly arranged between the knocking mechanism and the slag cleaning mechanism. When the knocking rod slides toward the welding part, the knocking rod drives the slag cleaning mechanism through the adjusting mechanism so as not to contact the welding part. When the knocking rod slides in the direction away from the welding part, the knocking rod drives the supporting block to slide in the opposite direction through the adjusting mechanism, so that the suction groove collects the residue.

[0007] Preferably, the knocking mechanism also includes a seating groove provided on the auxiliary block, a disc is rotatably connected in the seating groove, one end of the knocking rod extends out of the auxiliary block and is fixedly connected to a knocking head, the other end of the knocking rod extends into the seating groove and is fixedly connected to a guide ring, an insertion rod is eccentrically fixedly connected to the disc, the free end of the insertion rod is inserted into the guide ring, a motor is provided in the seating groove, and the output end of the motor is coaxially fixedly connected to the disc.

[0008] Preferably, one opening of the suction groove faces the metal brush, a collecting chamber is provided in the support block, and another opening of the suction groove is communicated with the collecting chamber.

[0009] Preferably, the slag cleaning mechanism also includes a piston cylinder fixedly connected to the support block, a piston rod is slidably connected inside the piston cylinder, one end of the piston cylinder is connected to the collection chamber through a conduit, and one end of the piston cylinder is also connected to an exhaust pipe.

[0010] Preferably, both the conduit and the exhaust pipe are provided with a one-way valve, the one-way valve is used for the gas in the conduit to flow unidirectionally toward the piston cylinder, and the one-way valve is used for the gas in the exhaust pipe to flow unidirectionally out of the piston cylinder.

[0011] Preferably, the adjustment mechanism includes a connecting rod hinged to the auxiliary block, and rocker arms are hinged at both ends of the connecting rod. The rocker arm away from the support block is hinged to the knocking rod, and the free end of the rocker arm close to the support block is hinged to a slider, and the slider is slidably connected to the support block. The side of the slider close to the metal brush is connected to the support block through a first elastic member.

[0012] Preferably, a driven rod is hingedly connected to one end of the connecting rod close to the supporting block, and a free end of the driven rod is hingedly connected to the piston rod.

[0013] Preferably, a lifting mechanism is sleeved on the welding gun body, a workbench is provided on one side of the lifting mechanism, a displacement mechanism is fixedly connected to the workbench, and the displacement mechanism and the lifting mechanism are connected via a support plate.

[0014] Preferably, a wire feeding mechanism is provided on the workbench for feeding wire to the welding gun body, and a rotating mechanism is provided on one side of the workbench. The rotating mechanism can be fixedly mounted on the welding pipe and is used to drive the welding gun body to rotate along the circumference of the welding pipe.

[0015] The present invention also provides application of the welding device as described above in a multi-layer and multi-pass welding process.

[0016] Technical effects and advantages of the present invention: 1. The present invention drives the welding gun body to rotate in a circle along the welding pipe through the provided rotating mechanism, displacement mechanism and lifting mechanism, so that the welding gun body can automatically weld the pipe, which can not only improve the welding efficiency and quality, but also reduce the inconvenience of manual welding. The provided knocking rod and knocking head can knock the cooled weld to make the welding slag on the weld fall off, thereby ensuring the neatness of the weld surface, facilitating the welding of the next layer, further improving the welding quality, reducing the operation of manual slag removal, and ensuring that the weld can bear a larger load.

[0017] 2. The present invention, through the linkage setting of the knocking rod and the support block in the adjustment mechanism, can not only knock off the residue on the weld by the knocking rod first, but also make the collecting chamber in a state of accumulated force and attraction in the process, and when the knocking rod drives the knocking head to stop knocking the pipe, the knocking rod drives the support block to move away from the pipe, and can increase the contact time between the metal brush and the weld, so that the metal brush can fully clean the residue on the weld surface, and then the cleaned residue can be sucked away under the negative pressure of the collecting chamber, thereby ensuring the neatness of the weld surface, and each weld surface can be cleaned, ensuring the quality and efficiency of multi-layer and multi-pass welding, and at the same time, the slag can be automatically cleaned, which reduces the workload of the staff and ensures the quality of welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of a welding gun body in the present invention; Figure 3 is a schematic diagram of an auxiliary block in the present invention; Figure 4 It is a structural cross-sectional view of the auxiliary block in the present invention; Figure 5 It is a schematic diagram of the structures of the adjusting mechanism, the knocking mechanism and the slag cleaning mechanism in the present invention; Figure 6 It is a structural schematic diagram of the adjusting mechanism, the knocking mechanism and the slag cleaning mechanism in the present invention from another perspective; Figure 7 It is a structural schematic diagram of the slag cleaning mechanism in the present invention; Figure 8 It is a structural cross-sectional view of the slag cleaning mechanism in the present invention.

[0019] In the figure: 1. welding gun body; 2. auxiliary block; 3. knocking mechanism; 301. knocking rod; 302. knocking head; 303. placement groove; 304. disc; 305. guide ring; 306. insertion rod; 307. motor; 4. Slag cleaning mechanism; 401. Support block; 402. Metal brush; 403. Suction groove; 404. Collection chamber; 405. Piston cylinder; 406. Piston rod; 407. Conduit; 408. Exhaust pipe; 409. One-way valve; 5. Adjustment mechanism; 501. Connecting rod; 502. Rocker rod; 503. Sliding block; 504. First elastic member; 505. Follower rod; 6. Lifting mechanism; 7. Workbench; 8. Displacement mechanism; 9. Support plate; 10. Wire feeding mechanism; 11. Rotation mechanism. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Embodiment 1 In the prior art, most industrial enterprises still use manual welding technology, which has low welding efficiency and is greatly affected by human factors. Welding defects often occur, which will affect the quality and safety of the entire project. Rework to eliminate defects also reduces the efficiency of the overall operation. Therefore, this embodiment is specially invented to solve the above problems.

[0022] like Figures 1 to 4 As shown, this embodiment provides a welding device, including a welding gun body 1, an auxiliary block 2 is fixedly connected to the welding gun body 1, a lifting mechanism 6 is sleeved on the welding gun body 1, a workbench 7 is provided on one side of the lifting mechanism 6, a displacement mechanism 8 is fixedly connected to the workbench 7, the displacement mechanism 8 and the lifting mechanism 6 are connected by a support plate 9, a wire feeding mechanism 10 is provided on the workbench 7, and is used to feed wire to the welding gun body 1, and a rotating mechanism 11 is provided on one side of the workbench 7, and the rotating mechanism 11 can be fixedly installed on the welding pipe, and is used to drive the welding gun body 1 to rotate along the circumference of the welding pipe.

[0023] A knocking mechanism 3 is slidably arranged on the auxiliary block 2 and is used for knocking the residue on the weld. The knocking mechanism 3 includes a knocking rod 301 slidably connected to the auxiliary block 2. One end of the knocking rod 301 extends out of the auxiliary block 2 and is fixedly connected to a knocking head 302. The knocking mechanism 3 also includes a seating groove 303 opened on the auxiliary block 2. A disc 304 is rotatably connected in the seating groove 303. The other end of the knocking rod 301 extends into the seating groove 303 and is fixedly connected to a guide ring 305. An insertion rod 306 is eccentrically fixedly connected to the disc 304. The free end of the insertion rod 306 is inserted into the guide ring 305. A motor 307 is provided in the seating groove 303. The output end of the motor 307 is coaxially fixedly connected to the disc 304.

[0024] In actual use, the rotating mechanism 11 is first installed on the welding pipeline, and the lifting mechanism 6, the displacement mechanism 8, the wire feeding mechanism 10 and the rotating mechanism 11 are all existing technologies, and the specific structure, connection method and control system are no longer repeated. At this time, the rotating mechanism 11 drives the welding gun body 1 to perform circular motion along the welding pipeline through the workbench 7, the displacement mechanism 8 and the lifting mechanism 6. At this time, the wire feeding mechanism 10 conveys welding wire to the welding gun body 1, so that the welding gun body 1 welds the pipeline. When the welding gun body 1 rotates 360 degrees, the first layer of weld at the pipeline is completed, and the welding gun body 1 stops working. After the temperature at the weld gradually cools down, the rotating mechanism 11 works again, and the motor 307 is started at the same time, and the motor 307 drives the disc 304 to rotate.

[0025] When the eccentric point of the disc 304 and the insertion rod 306 rotates from the outermost side to the innermost side, the disc 304 drives the knocking rod 301 to move toward the pipe through the insertion rod 306 and the guide ring 305, and the guide ring 305 is waist-shaped, so that the knocking rod 301 drives the knocking head 302 to knock on the weld, so that the residue on the weld falls off, and the neatness of the weld can be ensured. When the eccentric point of the disc 304 and the insertion rod 306 rotates from the innermost side to the outermost side, the disc 304 is The insertion rod 306 and the guide ring 305 drive the knocking rod 301 to move away from the pipeline, and the knocking rod 301 drives the knocking head 302 to stop knocking on the pipeline, and then repeats the above movement, so that the knocking rod 301 drives the knocking head 302 to knock on different positions of the weld in turn, which is convenient for knocking off the residue at the weld and facilitating the subsequent second welding, thereby ensuring the quality and efficiency of multi-layer and multi-pass welding, increasing the strength of the weld to withstand loads, and at the same time cleaning the slag of each layer of the weld to ensure the quality of the weld.

[0026] To sum up, the rotating mechanism 11, the displacement mechanism 8 and the lifting mechanism 6 are arranged to drive the welding gun body 1 to rotate in a circle along the welding pipe, so that the welding gun body 1 can automatically weld the pipe, which not only improves the welding efficiency and quality, but also reduces the inconvenience of manual welding. The knocking rod 301 and the knocking head 302 are arranged to knock on the cooled weld to make the welding slag on the weld fall off, thereby ensuring the neatness of the weld surface, facilitating the welding of the next layer, further improving the quality of welding, and reducing the operation of manual slag removal, ensuring that the weld can bear a larger load.

[0027] Embodiment 2 In the above embodiment, it is found that in the process of knocking and cleaning the weld, the knocked-off welding slag can separate from the pipeline by its own gravity, but there are still residues on the weld, which easily causes the weld surface to be untidy. When performing multi-layer and multi-pass welding, due to the presence of uncleaned residues, pores and cracks are likely to appear in the welding between layers, resulting in reduced welding quality. Therefore, further improvements are made on the basis of the above embodiment.

[0028] like Figures 4 to 8 As shown, a slag cleaning mechanism 4 is slidably arranged on the auxiliary block 2, and is used to clean and collect welding slag. The slag cleaning mechanism 4 includes a support block 401 slidably connected to the auxiliary block 2, a metal brush 402 is fixedly connected to the support block 401, a suction groove 403 is provided on the support block 401, an opening of the suction groove 403 faces the metal brush 402, a collection chamber 404 is provided in the support block 401, and another opening of the suction groove 403 is connected to the collection chamber 404; The adjusting mechanism 5 is hingedly arranged between the knocking mechanism 3 and the slag cleaning mechanism 4. When the knocking rod 301 slides toward the welding part, the knocking rod 301 drives the slag cleaning mechanism 4 through the adjusting mechanism 5 so as not to contact the welding part. When the knocking rod 301 slides in the direction away from the welding part, the knocking rod 301 drives the supporting block 401 to slide in the opposite direction through the adjusting mechanism 5, so that the suction groove 403 collects the residue.

[0029] The slag cleaning mechanism 4 also includes a piston cylinder 405 fixedly connected to the support block 401, a piston rod 406 is slidably connected inside the piston cylinder 405, one end of the piston cylinder 405 is connected to the collecting chamber 404 through a conduit 407, one end of the piston cylinder 405 is also connected to an exhaust pipe 408, and both the conduit 407 and the exhaust pipe 408 are provided with a one-way valve 409, the one-way valve 409 is used for the one-way flow of gas in the conduit 407 to the piston cylinder 405, and the one-way valve 409 is used for the one-way flow of gas in the exhaust pipe 408 from the piston cylinder 405.

[0030] The adjusting mechanism 5 includes a connecting rod 501 hinged to the auxiliary block 2. It should be noted that a pin is fixedly connected inside the auxiliary block 2, and the pin is rotatably connected to the middle part of the connecting rod 501. Both ends of the connecting rod 501 are hinged with rocker rods 502. The rocker rod 502 away from the support block 401 is hinged to the knocking rod 301, and the free end of the rocker rod 502 close to the support block 401 is hinged with a slider 503, and the slider 503 is slidably connected to the support block 401. The side of the slider 503 close to the metal brush 402 is connected to the support block 401 through a first elastic member 504. The end of the connecting rod 501 close to the support block 401 is hinged with a driven rod 505, and the free end of the driven rod 505 is hinged to the piston rod 406.

[0031] In actual use, when the eccentric point of the disc 304 and the insertion rod 306 rotates from the outermost side to the innermost side, the disc 304 drives the knocking rod 301 to move in the direction of the pipeline through the insertion rod 306 and the guide ring 305. At the same time, the knocking rod 301 drives the end of the connecting rod 501 close to the knocking rod 301 to swing in the direction of the pipeline through the swing rod 502. At this time, the end of the connecting rod 501 away from the knocking rod 301 swings in the direction away from the pipeline, so that the connecting rod 501 drives the slider 503 along the support block 401 through the swing rod 502. Sliding, at this time, the connecting rod 501 drives the piston rod 406 to slide along the piston cylinder 405 through the driven rod 505, and the piston rod 406 squeezes the gas in the piston cylinder 405 through the exhaust pipe 408, and a one-way valve 409 is provided in the conduit 407 to prevent the gas from being squeezed into the conduit 407. At this time, the slider 503 contacts the support block 401, and the slider 503 drives the support block 401 to slide away from the pipeline. The support block 401 drives the metal brush 402 no longer to contact the weld, and the first elastic member 504 is no longer compressed.

[0032] When the eccentric point of the disc 304 and the insertion rod 306 rotates from the innermost side to the outermost side, the disc 304 drives the knocking rod 301 to move away from the pipeline through the insertion rod 306 and the guide ring 305, and the knocking rod 301 drives the connecting rod 501 to swing away from the pipeline at one end close to the knocking rod 301 through the rocker rod 502, and the connecting rod 501 swings toward the pipeline at one end away from the knocking rod 301. Since the friction force between the support block 401 and the auxiliary block 2 is less than the elastic force of the first elastic member 504, the connecting rod 501 drives the support block 401 to slide in the direction of the pipeline through the rocker rod 502 and the slider 503. Under the elastic force of the first elastic member 504, the slider 503 does not move along the support block 401. After the support block 401 slides and drives the metal brush 402 to contact the weld, the support block 401 slides to the maximum stroke, and the knocking rod 301 continues to slide in the direction away from the pipe. Since the support block 401 no longer slides, the connecting rod 501 drives the slider 503 through the rocker rod 502 to overcome the elastic force of the first elastic member 504 and slide along the support block 401. The first elastic member 504 is compressed. At this time, in the process of the knocking rod 301 sliding in the direction away from the pipe, the contact time of the metal brush 402 with the weld can be increased, so that in the process of the welding gun body 1 rotating along the circumference of the pipe, the metal brush 402 can clean the residue on the surface of the weld to ensure the cleanliness of the weld surface.

[0033] At the same time, the connecting rod 501 drives the piston rod 406 to slide along the piston cylinder 405 through the driven rod 505, so that the piston rod 406 absorbs the gas in the collection chamber 404 into the piston cylinder 405 through the conduit 407. At this time, the gas in the collection chamber 404 is discharged to generate negative pressure. Under the action of the negative pressure, the residue on the weld is sucked into the suction groove 403 through the suction groove 403, and a filter is provided at the connection between the suction groove 403 and the conduit 407 to prevent the residue in the suction groove 403 from being sucked into the piston cylinder 405. At the same time, the opening of the suction groove 403 close to the metal brush 402 is inclined toward the metal brush 402, so as to better absorb the residue swept by the metal brush 402, and a slag cleaning port connected to the collection chamber 404 is provided on the support block 401, so as to clean the residue in the collection chamber 404. Then, the above movement is repeated to clean and collect the residue on the weld surface, thereby ensuring the quality of multi-layer and multi-pass welding.

[0034] To sum up, through the linkage setting of the knocking rod 301 and the support block 401 in the adjustment mechanism 5, not only can the knocking rod 301 knock off the residue on the weld first, but also the collecting chamber 404 can be placed in a state of accumulated force and attraction in the process. When the knocking rod 301 drives the knocking head 302 to stop knocking the pipe, the knocking rod 301 drives the support block 401 to move toward the direction close to the pipe, and can increase the contact time between the metal brush 402 and the weld, so that the metal brush 402 can fully clean the residue on the surface of the weld, and then the cleaned residue is sucked away under the negative pressure of the collecting chamber 404, thereby ensuring the neatness of the weld surface, and can also clean the surface of each weld, ensuring the quality and efficiency of multi-layer and multi-pass welding, and at the same time can automatically clean the slag, reduce the workload of the staff, and also ensure the quality of welding.

[0035] Based on the above embodiments, the present invention also provides the use of the welding device as described above in a multi-layer multi-pass welding process, thereby reducing the influence of residue on welding quality and improving welding efficiency in the multi-layer multi-pass welding process.

[0036] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A welding device, comprising a welding gun body, characterized in that: An auxiliary block is fixedly connected to the welding gun body; A knocking mechanism, which is slidably disposed on the auxiliary block and is used to knock the residue on the weld, and the knocking mechanism includes a knocking rod slidably connected to the auxiliary block; A slag cleaning mechanism, wherein the slag cleaning mechanism is slidably arranged on the auxiliary block, the slag cleaning mechanism comprises a support block slidably connected to the auxiliary block, a metal brush is fixedly connected to the support block, and a suction groove is provided on the support block; The adjusting mechanism is hingedly arranged between the knocking mechanism and the slag cleaning mechanism. When the knocking rod slides toward the welding part, the knocking rod drives the slag cleaning mechanism through the adjusting mechanism so as not to contact the welding part. When the knocking rod slides in the direction away from the welding part, the knocking rod drives the supporting block to slide in the opposite direction through the adjusting mechanism, so that the suction groove collects the residue.

2. A welding device according to claim 1, characterized in that: The knocking mechanism also includes a seating groove provided on the auxiliary block, a disc is rotatably connected in the seating groove, one end of the knocking rod extends out of the auxiliary block and is fixedly connected to a knocking head, the other end of the knocking rod extends into the seating groove and is fixedly connected to a guide ring, an insertion rod is eccentrically fixedly connected to the disc, the free end of the insertion rod is inserted into the guide ring, a motor is provided in the seating groove, and the output end of the motor is coaxially fixedly connected to the disc.

3. A welding device according to claim 2, characterized in that: One opening of the suction groove faces the metal brush, a collecting chamber is provided in the support block, and another opening of the suction groove is communicated with the collecting chamber.

4. A welding device according to claim 3, characterized in that: The slag cleaning mechanism also includes a piston cylinder fixedly connected to the support block, a piston rod is slidably connected in the piston cylinder, one end of the piston cylinder is connected to the collection chamber through a conduit, and one end of the piston cylinder is also connected to an exhaust pipe.

5. A welding device according to claim 4, characterized in that: Both the conduit and the exhaust pipe are provided with a one-way valve, the one-way valve is used for the gas in the conduit to flow toward the piston cylinder in one direction, and the one-way valve is used for the gas in the exhaust pipe to flow out of the piston cylinder in one direction.

6. A welding device according to claim 5, characterized in that: The adjustment mechanism includes a connecting rod hinged to the auxiliary block, and rocker arms are hinged at both ends of the connecting rod. The rocker arm away from the support block is hinged to the knocking rod, and a slider is hinged at the free end of the rocker arm close to the support block. The slider is slidably connected to the support block, and the side of the slider close to the metal brush is connected to the support block through a first elastic member.

7. A welding device according to claim 6, characterized in that: A driven rod is hingedly connected to one end of the connecting rod close to the supporting block, and a free end of the driven rod is hingedly connected to the piston rod.

8. A welding device according to claim 7, characterized in that: The welding gun body is sleeved with a lifting mechanism, a workbench is arranged on one side of the lifting mechanism, a displacement mechanism is fixedly connected to the workbench, and the displacement mechanism and the lifting mechanism are connected via a support plate.

9. A welding device according to claim 8, characterized in that: The workbench is provided with a wire feeding mechanism for feeding wire to the welding gun body. A rotating mechanism is provided on one side of the workbench. The rotating mechanism can be fixedly mounted on the welding pipe and is used to drive the welding gun body to rotate along the circumference of the welding pipe.

10. Use of the welding device according to any one of claims 1 to 9 in a multi-layer and multi-pass welding process.

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