Precision welding equipment and welding method for high-pressure pipe fittings

Abstract

The present invention relates to the technical field of high-pressure pipe fittings, specifically to a precision welding device for high-pressure pipe fittings, comprising a gas box and a welding mechanism, wherein the gas box and the welding mechanism are connected via a connecting hose; a placement box is provided on the upper end face of the gas box, and a coil mechanism for winding and connecting the connecting hose is also rotatably provided on the upper end face of the gas box; the welding mechanism comprises an arc-shaped movable plate, the lower end faces of the two end faces of the arc-shaped movable plate are connected to support blocks, the inner side faces of the two support blocks are provided with a moving mechanism for moving the arc-shaped movable plate, and the inner side faces of the two support blocks are also provided with a fixing mechanism for fixing the arc-shaped movable plate; the front side face of the arc-shaped movable plate is provided with an electric slide provided with a welding gun mechanism, and the welding gun mechanism is used for welding pipelines. The present invention is easy to move, can be moved to a desired position, and replaces manual welding. The staff only needs to be able to operate the device, and can use it without too much welding experience, which can greatly improve the accuracy of pipeline welding.

Description

Technical Field

[0001] The invention relates to a welding device, in particular to a precise welding device for high-pressure pipe fittings and a welding method thereof, belonging to the technical field of high-pressure pipe fittings. Background Art

[0002] High-pressure pipe fittings refer to many types of high-pressure pipes and connection components, among which high-pressure pipes are one type of high-pressure pipe fittings. When high-pressure pipes are used, they need to be connected according to the length of use. The existing connection methods are all welded. Compared with the method of using connectors, the welding method has better sealing and is not easy to leak;

[0003] In some processing factories, equipment welding is used for connection processing. However, at the installation site, since the equipment inside the factory is large and difficult to move, manual welding is mostly used at the installation site.

[0004] However, manual welding is inefficient, and the different welding experiences of welders will directly affect the welding accuracy of high-pressure pipe fittings. Therefore, there will be accuracy deviations in the welding of high-pressure pipelines, which may affect the subsequent connection effect of high-pressure pipe fittings.

[0005] Therefore, it is urgent to improve the welding of high-pressure pipelines to solve the above-mentioned problems. Summary of the invention

[0006] The purpose of the present invention is to provide a precise welding device for high-pressure pipe fittings and a welding method thereof, which are easy to move and can be moved to a desired position to replace manual welding. The staff only needs to be able to operate the device and can use it without too much welding experience. Therefore, the precision of pipeline welding will not be different due to different welding experience, thereby greatly improving the accuracy of pipeline welding.

[0007] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0008] A precision welding device for high-pressure pipe fittings, comprising an air box and a welding mechanism, wherein the air box and the welding mechanism are connected via a connecting hose; a placement box is provided on the upper end surface of the air box, the placement box is used to place the welding mechanism, and a coil mechanism for winding the connecting hose is also rotatably provided on the upper end surface of the air box;

[0009] The welding mechanism comprises an arc-shaped movable plate, a first support block, a movable mechanism, a fixing mechanism and a welding gun mechanism, the lower end surfaces of the two end surfaces of the arc-shaped movable plate are connected to the first support blocks, the inner side surfaces of the two first support blocks are provided with the movable mechanism for moving the arc-shaped movable plate, and the inner side surfaces of the two first support blocks are also provided with the fixing mechanism for fixing the arc-shaped movable plate;

[0010] The front side of the arc-shaped movable plate is provided with the welding gun mechanism which can slide electrically, and the welding gun mechanism is used for welding pipelines.

[0011] Preferably, the arc-shaped movable plate is a semicircular structure that half wraps the pipe, the front end face of the arc-shaped movable plate is provided with an arc-shaped electric slide rail with the same shape as the front end face of the arc-shaped movable plate, the welding gun mechanism is slidingly connected to the arc-shaped electric slide rail, and the upper end face of the arc-shaped movable plate is provided with a lifting handle.

[0012] Preferably, the welding gun mechanism includes a sliding plate, a first electric telescopic rod and a welding gun, the sliding plate is slidably connected to the arc-shaped electric slide rail, the first electric telescopic rod is vertically arranged on the lower end surface of the sliding plate, the welding gun is connected to the telescopic end of the electric telescopic rod, the nozzle of the welding gun is downward, and the welding gun is connected to the gas box through the connecting hose.

[0013] Preferably, a gas pipeline is provided on the upper end surface of the gas box, the gas pipeline is connected to the connecting hose, and the connection between the gas pipeline and the connecting hose is closed by a first valve.

[0014] Preferably, the two moving mechanisms are symmetrically arranged, and the moving mechanism includes a second electric telescopic rod, a second support block, a first slow-speed motor and a driving wheel. The second electric telescopic rod is laterally arranged in the middle part of the inner side of the first support block, the second support block is connected to the telescopic end of the second electric telescopic rod, the first slow-speed motor is clamped inside the second support block, the output end of the first slow motor extends to the bottom of the second support block and is connected to the driving wheel, and the lower end surface of the second support block is also rotatably connected to an auxiliary wheel, and the outer surfaces of the driving wheel and the auxiliary wheel both protrude from both sides of the second support block.

[0015] Preferably, the fixing mechanism includes two third electric telescopic rods, and fixing plates are arranged at the telescopic ends of the third electric telescopic rods, and the two electric telescopic rods are respectively arranged on both sides of the inner side of the first support block.

[0016] Preferably, the coil mechanism includes a support plate, a rotating disk and a second slow-speed motor, the support plate is vertically arranged on the upper end surface of the air box, one side of the rotating disk is rotatably connected to the support plate, and the other side of the rotating disk is connected to the output end of the second slow-speed motor, and a support body for supporting the second slow-speed motor is arranged on the lower end surface of the second slow-speed motor, and the connecting hose is wound around the rotating disk.

[0017] Preferably, an arc groove is vertically opened on one side of the placement box close to the coil mechanism, a rubber pad is attached to the inner wall of the arc groove, positioning holes are provided on both sides of the lower end surface of the placement box, a first adsorption magnet is provided inside the positioning hole, a positioning rod is provided on the lower end surface of the first support block, and a second adsorption magnet that is mutually adsorbed with the first adsorption magnet is provided on the lower end surface of the positioning rod.

[0018] Preferably, one side of the air box is connected to a gas filling pipe, the gas filling pipe is closed by a second valve, a push-pull handle is provided on one side of the air box, and a plurality of evenly distributed movable rollers are provided on the lower end surface of the air box.

[0019] A welding method of a precision welding device for high-pressure pipe fittings comprises the following steps:

[0020] S1: Move the equipment to the desired position, and then support the two high-pressure pipes to be welded with a support frame or other support body, so that the connection interfaces of the two pipes are in horizontal contact, and then take out the welding mechanism from the inside of the placement box and place it on any one of the pipes. The two symmetrically arranged moving mechanisms are turned on at the same time, and the second electric telescopic rod is used to make the second support block approach the pipe surface until the driving wheel and the auxiliary wheel are both in contact with the pipe surface, and then the first slow-speed motor is turned on to drive the driving wheel to rotate, so that the welding mechanism is moved to the connection of the two pipes, and the welding port of the welding gun is moved close to the connection of the two pipes by extending the first electric telescopic rod, and then the third electric telescopic rod is used to drive the fixing plate close to the pipe surface, so as to fix the welding mechanism, and the preparation work is completed;

[0021] S2: Then open the first valve to ventilate the gas box and the welding gun, and turn on the welding gun at the same time, and use the opening of the arc-shaped electric slide rail to drive the welding gun to perform circular welding at the connection of the pipeline, so that a part of the connection between the two pipelines can be accurately welded. When the welding of a part of the connection between the two pipelines is completed, the welding mechanism is removed and placed on another part of the pipeline, and the fixing mechanism and the moving mechanism are used again to accurately move the welding mechanism to the connection of the pipeline and fix it, and then continue to perform circular welding.

[0022] The present invention has at least the following beneficial effects:

[0023] 1. By using the easy-to-move gas box and the welding gun mechanism placed on it, it can be moved to the desired position, and the welding gun mechanism is used instead of manual welding. When welding, the worker only needs to place the welding mechanism on the pipeline, and use the moving mechanism and the fixing mechanism to accurately move to the connection of the pipeline and fix it to perform accurate welding. It can be used without too much welding experience, so the accuracy of pipeline welding will not be different due to different welding experience, thereby greatly improving the accuracy of pipeline welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the coil mechanism of the present invention;

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the welding mechanism of the present invention;

[0028] Figure 4 It is a schematic diagram of the welding mechanism of the present invention;

[0029] Figure 5 It is a cross-sectional view of a placement box of the present invention.

[0030] In the figure, 1-gas box, 101-placing box, 2-welding mechanism, 3-connecting hose, 4-arc-shaped moving plate, 5-first supporting block, 6-moving mechanism, 601-second electric telescopic rod, 602-second supporting block, 603-first slow motor, 604-driving wheel, 605-auxiliary wheel, 7-fixing mechanism, 701-third electric telescopic rod, 702-fixing plate, 8-welding gun mechanism, 801-sliding plate, 802-first electric telescopic rod, 803-welding Gun, 9-arc electric slide rail, 10-gas pipeline, 11-first valve, 12-lifting handle, 13-coil mechanism, 1301-support plate, 1302-rotating disk, 1303-second slow motor, 1304-support body, 14-arc groove, 15-rubber pad, 16-positioning hole, 17-first adsorption magnet, 18-positioning rod, 19-second adsorption magnet, 20-gas filling pipe, 21-second valve, 22-push and pull handle, 23-moving roller. DETAILED DESCRIPTION

[0031] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0032] like Figure 1-Figure 5 As shown, the precision welding equipment for high-pressure pipe fittings provided in this embodiment includes a gas box 1 and a welding mechanism 2, wherein the gas box 1 and the welding mechanism 2 are connected via a connecting hose 3; a gas pipeline 10 is provided on the upper end surface of the gas box 1, and the gas pipeline 10 is connected to the connecting hose 3, and the connection between the gas pipeline 10 and the connecting hose 3 is closed by a first valve 11, and by opening the first valve 11, ventilation between the gas box 1 and the welding gun 803 is achieved, thereby achieving normal welding of the welding gun 803;

[0033] The upper end surface of the gas box 1 is provided with a placement box 101, and the placement box 101 is used to place the welding mechanism 2. The upper end surface of the gas box 1 is also rotatably provided with a coil mechanism 13 for winding and connecting the connecting hose 3; the coil mechanism 13 includes a support plate 1301, a rotating disk 1302 and a second slow motor 1303. The support plate 1301 is vertically arranged on the upper end surface of the gas box 1, one side of the rotating disk 1302 is rotatably connected to the support plate 1301, and the other side of the rotating disk 1302 is connected to the output end of the second slow motor 1303. The lower end surface of the second slow motor 1303 is provided with a support body 1304 for supporting the second slow motor 1303. The connecting hose 3 is wound on the rotating disk 1302. When the welding mechanism 2 moves on the pipeline, the second slow motor 1303 drives the rotating disk 1302 to rotate at the same time, so that the connecting hose 3 on the rotating disk 1302 can be correspondingly extended, which does not affect the normal ventilation welding of the welding mechanism 2.

[0034] The welding mechanism 2 includes an arc-shaped movable plate 4, a first support block 5, a movable mechanism 6, a fixing mechanism 7 and a welding gun mechanism 8. The lower end surfaces of the two end surfaces of the arc-shaped movable plate 4 are connected to the first support blocks 5. The inner side surfaces of the two first support blocks 5 are provided with movable mechanisms 6 for moving the arc-shaped movable plate 4. The two movable mechanisms 6 are symmetrically arranged. The movable mechanism 6 includes a second electric telescopic rod 601, a second support block 602, a first slow motor 603 and a driving wheel 604. The second electric telescopic rod 601 is horizontally arranged on the first support block 5. In the middle part of the inner side, the second support block 602 is connected to the telescopic end of the second electric telescopic rod 601, the first slow motor 603 is clamped inside the second support block 602, the output end of the first slow motor 603 extends to the bottom of the second support block 602 and is connected to the driving wheel 604, the lower end surface of the second support block 602 is also rotatably connected to the auxiliary wheel 605, the outer surfaces of the driving wheel 604 and the auxiliary wheel 605 both protrude from both sides of the second support block 602, and the setting of the auxiliary wheel 605 can improve the stability of the mobile mechanism 6 when moving;

[0035] The inner side surfaces of the two first support blocks 5 are also provided with a fixing mechanism 7 for fixing the arc-shaped movable plate 4; the fixing mechanism 7 includes two third electric telescopic rods 701 provided on a fixing plate 702 at the telescopic end of the third electric telescopic rod 701, and the two electric telescopic rods 701 are respectively provided on both sides of the inner side surface of the first support block 5;

[0036] The front side of the arc-shaped movable plate 4 is provided with an electrically slidable welding gun mechanism 8, which is used for welding pipes; the welding gun mechanism 8 includes a sliding plate 801, a first electric telescopic rod 802 and a welding gun 803, the sliding plate 801 is slidably connected to the arc-shaped electric slide rail 9, the first electric telescopic rod 802 is vertically arranged on the lower end surface of the sliding plate 801, the welding gun 803 is connected to the telescopic end of the electric telescopic rod 802, the nozzle of the welding gun 803 is downward, and the welding gun 803 is connected to the gas box 1 through the connecting hose 3.

[0037] Further, such as Figures 1 to 4 As shown, the arc-shaped movable plate 4 is a semicircular structure that half wraps the pipe. The front end face of the arc-shaped movable plate 4 is provided with an arc-shaped electric slide rail 9 with the same shape as the front end face of the arc-shaped movable plate 4. The welding gun mechanism 8 is slidably connected to the arc-shaped electric slide rail 9, so as to realize annular welding of the pipe connection. The upper end face of the arc-shaped movable plate 4 is provided with a lifting handle 12, which facilitates taking the welding mechanism 2 out of the placement box 101 and placing it on the pipe.

[0038] Furthermore, if Figure 1 and Figure 5 As shown, an arc groove 14 is vertically opened on one side of the placement box 101 close to the coil mechanism 13. The arc groove 14 is used to place the connecting hose 3. A rubber pad 15 is attached to the inner wall of the arc groove 14. The rubber pad 15 is placed to prevent the connecting hose 3 from being scratched. Positioning holes 16 are provided on both sides of the lower end surface of the placement box 101. A first adsorption magnet 17 is provided inside the positioning hole 16. A positioning rod 18 is provided on the lower end surface of the first support block 5. A second adsorption magnet 19 that is mutually adsorbed with the first adsorption magnet 17 is provided on the lower end surface of the positioning rod 18. When the welding mechanism 2 is used, the welding mechanism 2 is inserted into the positioning hole 16 using the positioning rod 18, and the welding mechanism 2 is fixed in the placement box 101 by using the mutual adsorption of the first adsorption magnet 17 and the second adsorption magnet 19. The placement does not cause shaking.

[0039] Further, such as Figure 1As shown, one side of the air box 1 is connected to a gas filling pipe 20, which is closed by a second valve 21. When the gas inside the air box 1 is insufficient, the second valve 21 is opened to fill the air into the air box 1 using the gas filling pipe 20. A push-pull handle 22 is provided on one side of the air box 1, which facilitates pushing the air box 1. A plurality of evenly distributed moving rollers 23 are provided on the lower end surface of the air box 1, and the moving rollers 23 enable the device to have a moving effect.

[0040] A welding method of a precision welding device for high-pressure pipe fittings comprises the following steps:

[0041] S1: Move the equipment to the desired position, and then support the two high-pressure pipes to be welded with a support frame or other support body so that the connection interfaces of the two pipes are in horizontal contact, and then take out the welding mechanism 2 from the inside of the placement box 101 and place it on any one of the pipes. The two symmetrically arranged moving mechanisms 6 are turned on at the same time, and the second electric telescopic rod 601 is used to make the second support block 602 approach the pipe surface until the driving wheel 604 and the auxiliary wheel 605 are both in contact with the pipe surface, and then the first slow-speed motor 603 is turned on to drive the driving wheel 604 to rotate, so that the welding mechanism 2 is moved to the connection of the two pipes, and the first electric telescopic rod 802 is extended to make the welding port of the welding gun 803 close to the connection of the two pipes, and then the third electric telescopic rod 701 is used to drive the fixing plate 702 close to the pipe surface, so as to fix the welding mechanism 2, and the preparation work is completed;

[0042] S2: Then open the first valve 11 to ventilate the gas box 1 and the welding gun 803, and turn on the welding gun 803 at the same time, and use the opening of the arc-shaped electric slide rail 9 to drive the welding gun 803 to perform circular welding at the connection of the pipeline, so that a part of the connection between the two pipelines can be accurately welded. When a part of the connection between the two pipelines is welded, remove the welding mechanism 2 and place it on another part of the pipeline. Use the fixing mechanism 7 and the moving mechanism 6 again to accurately move the welding mechanism 2 to the connection of the pipeline and fix it, and then continue to perform circular welding.

[0043] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0044] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0045] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A precision welding device for high-pressure pipe fittings, comprising a gas box (1) and a welding mechanism (2), characterized in that: The gas box (1) is connected to the welding mechanism (2) via a connecting hose (3); a placement box (101) is provided on the upper end surface of the gas box (1), the placement box (101) is used to place the welding mechanism (2), and a coil mechanism (13) for winding the connecting hose (3) is also rotatably provided on the upper end surface of the gas box (1); The welding mechanism (2) comprises an arc-shaped movable plate (4), a first support block (5), a movable mechanism (6), a fixing mechanism (7) and a welding gun mechanism (8); the lower end surfaces of the two end surfaces of the arc-shaped movable plate (4) are connected to the first support blocks (5); the inner side surfaces of the two first support blocks (5) are provided with the movable mechanism (6) for moving the arc-shaped movable plate (4); and the inner side surfaces of the two first support blocks (5) are also provided with the fixing mechanism (7) for fixing the arc-shaped movable plate (4); The front side of the arc-shaped movable plate (4) is provided with a welding gun mechanism (8) that can slide electrically. The welding gun mechanism (8) is used for welding pipes. The arc-shaped movable plate (4) is a semicircular structure that half wraps the pipe. The front end surface of the arc-shaped movable plate (4) is provided with an arc-shaped electric slide rail (9) having the same shape as the front end surface of the arc-shaped movable plate (4). The welding gun mechanism (8) is slidably connected to the arc-shaped electric slide rail (9). The upper end surface of the arc-shaped movable plate (4) is provided with a lifting handle (12). The two movable mechanisms (6) are symmetrically arranged. The movable mechanism (6) comprises a second electric telescopic rod (601), a second support block (602), a first slow-speed motor (603) and The second electric telescopic rod (601) is transversely arranged at the middle part of the inner side of the first support block (5); the second support block (602) is connected to the telescopic end of the second electric telescopic rod (601); the first slow motor (603) is clamped inside the second support block (602); the output end of the first slow motor (603) extends to the bottom of the second support block (602) and is connected to the driving wheel (604); the lower end surface of the second support block (602) is also rotatably connected to an auxiliary wheel (605); the outer surfaces of the driving wheel (604) and the auxiliary wheel (605) both protrude from both sides of the second support block (602).

2. The precision welding equipment for high-pressure pipe fittings according to claim 1, characterized in that: The welding gun mechanism (8) comprises a sliding plate (801), a first electric telescopic rod (802) and a welding gun (803); the sliding plate (801) is slidably connected to the arc-shaped electric slide rail (9); the first electric telescopic rod (802) is vertically arranged on the lower end surface of the sliding plate (801); the welding gun (803) is connected to the telescopic end of the electric telescopic rod (802); the nozzle of the welding gun (803) is downward; and the welding gun (803) is connected to the gas box (1) via the connecting hose (3).

3. The precision welding equipment for high-pressure pipe fittings according to claim 2 is characterized in that: The upper end surface of the gas box (1) is provided with a gas pipeline (10), the gas pipeline (10) is connected to the connecting hose (3), and the connection between the gas pipeline (10) and the connecting hose (3) is closed by a first valve (11).

4. The precision welding equipment for high-pressure pipe fittings according to claim 3 is characterized in that: The fixing mechanism (7) comprises two third electric telescopic rods (701) and a fixing plate (702) arranged at the telescopic ends of the third electric telescopic rods (701), and the two electric telescopic rods (701) are respectively arranged on both sides of the inner side surface of the first support block (5).

5. The precision welding equipment for high-pressure pipe fittings according to claim 4, characterized in that: The coil mechanism (13) comprises a support plate (1301), a rotating disk (1302) and a second slow-speed motor (1303); the support plate (1301) is vertically arranged on the upper end surface of the air box (1); one side of the rotating disk (1302) is rotatably connected to the support plate (1301); the other side of the rotating disk (1302) is connected to the output end of the second slow-speed motor (1303); a support body (1304) for supporting the second slow-speed motor (1303) is arranged on the lower end surface of the second slow-speed motor (1303); and the connecting hose (3) is wound around the rotating disk (1302).

6. The precision welding equipment for high-pressure pipe fittings according to claim 5, characterized in that: A side of the placement box (101) close to the coil mechanism (13) is vertically provided with an arc groove (14), and a rubber pad (15) is attached to the inner wall of the arc groove (14). Positioning holes (16) are provided on both sides of the lower end surface of the placement box (101), and a first adsorption magnet (17) is provided inside the positioning hole (16). A positioning rod (18) is provided on the lower end surface of the first support block (5), and a second adsorption magnet (19) that is mutually adsorbed with the first adsorption magnet (17) is provided on the lower end surface of the positioning rod (18).

7. The precision welding equipment for high-pressure pipe fittings according to claim 6, characterized in that: One side of the air box (1) is connected to a gas filling pipe (20), the gas filling pipe (20) is closed by a second valve (21), one side of the air box (1) is provided with a push-pull handle (22), and the lower end surface of the air box (1) is provided with a plurality of evenly distributed movable rollers (23).

8. A welding method of the high pressure pipe fitting precision welding device as claimed in claim 7, characterized in that: The steps include: S1: Move the device to the desired position, and then support the two high-pressure pipes to be welded by using a support frame or other support body, so that the connection interfaces of the two pipes are in horizontal contact, then take out the welding mechanism (2) from the inside of the placement box (101), and place it on any one of the pipes, and simultaneously start the two symmetrically arranged moving mechanisms (6), and use the second electric telescopic rod (601) to make the second support block (602) approach the pipe surface until the driving wheel (604) and the auxiliary wheel (605) are both in contact with the pipe surface, and then start the first slow-speed motor (603) to drive the driving wheel (604) to rotate, so that the welding mechanism (2) moves to the connection of the two pipes, and uses the first electric telescopic rod (802) to extend so that the welding port of the welding gun (803) approaches the connection of the two pipes, and then uses the third electric telescopic rod (701) to drive the fixing plate (702) close to the pipe surface, so that the welding mechanism (2) is fixed, and the preparation work is completed; S2: Then, the first valve (11) is opened to allow ventilation between the gas box (1) and the welding gun (803), and the welding gun (803) is turned on at the same time. The arc-shaped electric slide rail (9) is opened to drive the welding gun (803) to perform circular welding at the connection of the pipeline, so that a part of the connection between the two pipelines can be accurately welded. When the welding of a part of the connection between the two pipelines is completed, the welding mechanism (2) is removed and placed on another part of the pipeline. The fixing mechanism (7) and the moving mechanism (6) are used again to accurately move the welding mechanism (2) to the connection of the pipeline and fix it, and then the circular welding can be continued.

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