A welding device and welding method for metal pipes used in water conservancy construction

Abstract

This invention belongs to the field of metal pipe welding technology, and particularly relates to a metal pipe welding device for water conservancy construction. The device includes a base plate, with a first pipe fastener and a second pipe fastener distributed horizontally on the top of the base plate. A welding mechanism is provided between the first and second pipe fasteners. A welding method for the metal pipe welding device for water conservancy construction is also provided, characterized by the following steps: S1. A construction pit is excavated beforehand at the welding end of the original metal pipe. The base plate is laid in the construction pit and fixed with mud nails. Subsequently, the first pipe fastener is fixedly fitted onto the original metal pipe. This invention can automatically complete the welding of metal pipes, and the weld between pipes is stable during the welding process, improving welding efficiency while ensuring welding effect.

Description

Technical Field

[0001] This invention relates to the field of metal pipe welding technology, and in particular to a metal pipe welding device and welding method for water conservancy construction. Background Technology

[0002] Water conservancy projects are engineering projects constructed to control and regulate surface water and groundwater in nature to achieve the goals of mitigating harm and promoting benefits. Only by constructing water conservancy projects can water flow be controlled, floods prevented, and water volume regulated and distributed to meet the water needs of people's lives and production. Water conservancy projects require the construction of various types of hydraulic structures, such as dams, dikes, spillways, sluice gates, intakes, canals, ferries, raft channels, and fishways, to achieve their objectives. During the construction process, the laying and welding of metal pipelines is often necessary to ensure the connectivity between multiple sections of the pipeline.

[0003] However, in water conservancy construction, metal pipes are laid in sections. Once each section is laid, its position cannot be moved. When welding the next section, a crane is needed to lift the pipe to a suitable height, and then the welding ends are pushed together manually before manual welding can be carried out. This method is not only labor-intensive, but also has low welding accuracy and cannot guarantee the stability of the weld during the welding process.

[0004] To address the aforementioned issues, we propose a welding device and welding method for metal pipes used in water conservancy construction. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the background art by proposing a metal pipe welding device for water conservancy construction.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a metal pipe welding device and welding method for water conservancy construction, comprising a base plate, on which a first pipe fastener and a second pipe fastener are arranged on the left and right sides, a welding mechanism is provided between the first pipe fastener and the second pipe fastener, and an installation plate is fixedly connected to the lower end of both the first pipe fastener and the second pipe fastener. Four telescopic rods arranged in a rectangular pattern are fixedly connected to the lower end of the installation plate located on the left side. A moving mechanism is provided at the upper end of the base plate and below the installation plate located on the right side. The moving mechanism is connected to the installation plate located on the right side through a lifting component. The first pipe fastener is fastened to the original metal pipe, and the second pipe fastener is fastened to the new metal pipe. The lifting mechanism is used to adjust the height of the new metal pipe so that it is consistent with the height of the original metal pipe, thereby using the moving mechanism to move its welding end to coincide with the welding end of the original metal pipe.

[0007] In the above-mentioned welding device and welding method for metal pipes used in water conservancy construction, four rectangularly distributed inserts are fixedly connected to the upper end of the base plate, and the telescopic ends of the four telescopic rods are inserted into the corresponding inserts.

[0008] In the aforementioned welding device for metal pipes used in water conservancy construction, the moving mechanism includes two upright plates fixedly connected to a base plate and distributed to the left and right. A first threaded rod and a guide rod are provided between the two upright plates. The first threaded rod is rotatably connected to the two upright plates, and the guide rod is fixedly connected to the two upright plates. A first motor that drives the first threaded rod to rotate is fixedly installed on the upright plate on the right side. A sleeve plate is sleeved on both the first threaded rod and the guide rod. The sleeve plate is threadedly connected to the first threaded rod and slidably connected to the guide rod. A moving plate is fixedly connected to the upper end of the sleeve plate, and four moving wheels that roll in contact with the base plate are installed at the lower end of the moving plate.

[0009] In the aforementioned metal pipe welding device for water conservancy construction, four rectangularly distributed fixing blocks are fixedly connected to the upper end of the movable plate and the lower end of the mounting plate on the right side. A second threaded rod is rotatably connected between the two fixing blocks on the right side of the movable plate, and a sliding rod is fixedly connected between the two fixing blocks on the left side of the movable plate. An upper sliding rod is fixedly connected between every two corresponding fixing blocks at the lower end of the mounting plate. The lifting component includes two coaxially arranged cross movable rods. The rear ends of the two cross movable rods are rotatably connected to the four fixing blocks on the rear side, and the front ends of the two cross movable rods are rotatably connected to movable sleeves. The four movable sleeves are respectively sleeved on the second threaded rod, the sliding rod, and the upper sliding rod. The movable sleeves are threadedly connected to the second threaded rod and slidably connected to the sliding rod and the upper sliding rod. A connecting rod is fixedly connected between every two corresponding movable sleeves. A second motor that drives the second threaded rod to rotate is fixedly installed on one of the fixing blocks.

[0010] In the aforementioned welding device for metal pipes used in water conservancy construction, the welding mechanism includes a positioning ring fitted onto a new metal pipe. The positioning ring is composed of two semi-arc frames arranged opposite each other, connected by bolts. Semi-arc grooves are formed on the outer arc surfaces of the two semi-arc frames, and the two semi-arc grooves are interconnected to form an annular groove. A sliding block is slidably connected inside the annular groove. An electric trolley is fixedly installed at one end of the sliding block outside the annular groove. The wheels of the electric trolley roll in contact with the outer circumferential surface of the positioning ring. A welding torch is installed on the electric trolley. Two positioning clamping mechanisms are provided on the inner arc surfaces of the two semi-arc frames, and the four positioning clamping mechanisms are evenly distributed circumferentially.

[0011] In the aforementioned welding device for metal pipes used in water conservancy construction, the positioning and clamping mechanism includes two end plates fixedly connected to the inner wall of a semi-circular frame, spaced apart from each other. A bidirectional threaded rod is rotatably connected between the two end plates. Two threaded sleeves symmetrically arranged on the bidirectional threaded rod are threaded onto the rod. Movable connecting rods are rotatably connected to each of the two threaded sleeves. A contact block is rotatably connected to the end of each movable connecting rod away from the threaded sleeve. A limiting groove is laterally opened on the inner wall of the semi-circular frame at the corresponding position of each threaded sleeve. A limiting block is slidably connected in each limiting groove. The end of the limiting block away from the limiting groove is fixedly connected to the corresponding threaded sleeve. One end of the bidirectional threaded rod passes through the end plate and is coaxially fixedly connected to a rotating block.

[0012] A welding method for a metal pipe welding device used in water conservancy construction, characterized by the following steps:

[0013] S1. First, excavate a construction pit at the welding end of the original metal pipe, lay the bottom plate in the construction pit and fix it with mud nails. Then, fix the first pipe fastener onto the original metal pipe and insert the four telescopic rods below into the four sockets. Then fix the second pipe fastener onto the new metal pipe.

[0014] S2. Assemble the two semi-circular frames near the welding end of the new metal pipe to form a positioning ring. By rotating each rotating block, make the four contact blocks abut against the outer wall of the new metal pipe, so that the positioning ring is concentric with the new metal pipe. During the assembly process, slide the sliding block in the semi-circular groove and then complete the installation of the electric trolley and welding gun.

[0015] S3. The second motor drives the lifting component to work, thereby lifting the new metal pipe and moving it to the same height as the original metal pipe. Then, the first motor drives the first threaded rod to rotate, thereby using the moving mechanism to move the new metal pipe toward the original metal pipe until the welding ends of the two are in contact and overlap, so that the weld formed remains stable.

[0016] S4. Adjust the welding torch so that its welding head is aligned with the weld seam. Then, move the electric trolley along the annular slide groove to drive the welding torch to make a circular motion, thus completing the welding work on the two metal pipes.

[0017] S5. After welding is completed, the first pipe fastener, the second pipe fastener, the positioning ring and the base plate can be disassembled and removed before welding the next section of metal pipe.

[0018] Compared with existing technologies, the advantages of this invention are:

[0019] 1. By setting the first pipe fastener and the second pipe fastener, the original metal pipe and the new metal pipe can be easily connected to this device. Then, the movement of the new metal pipe can be controlled by the moving mechanism and the lifting component to make it level with the original metal pipe and make the weld points of the two coincide to maintain the stability of the weld.

[0020] 2. By setting up a welding mechanism, the welding mechanism can be assembled on the new metal pipe through two semi-circular frames, and thus move to the welding position with the new metal pipe. The electric trolley moves in a circle on the positioning ring formed by the semi-circular frames, thereby controlling the welding torch to move in a circle around the positioning ring. In this way, the welding of the circumferential weld seam of the metal pipe can be carried out without rotating the metal pipe. The welding work is carried out automatically, without the need for manual welding. The entire welding work does not require a large amount of manpower, which greatly improves the welding efficiency and saves labor costs. Attached Figure Description

[0021] Figure 1 This is a perspective view of a metal pipe welding device for water conservancy construction proposed in this invention;

[0022] Figure 2 This is a partial three-dimensional view of a metal pipe welding device for water conservancy construction proposed in this invention.

[0023] Figure 3 This is a perspective view of the base plate in a metal pipe welding device for water conservancy construction proposed in this invention.

[0024] Figure 4 This is a perspective view of the moving mechanism in a metal pipe welding device for water conservancy construction proposed in this invention.

[0025] Figure 5 This is a perspective view of the welding mechanism in a metal pipe welding device for water conservancy construction proposed in this invention;

[0026] Figure 6 This is a three-dimensional view of a welding mechanism in a metal pipe welding device for water conservancy construction proposed in this invention.

[0027] Figure 7 This is a perspective view of an electric trolley in a metal pipe welding device for water conservancy construction proposed in this invention.

[0028] Figure 8 This is a perspective view of the positioning and clamping mechanism in a metal pipe welding device for water conservancy construction proposed in this invention.

[0029] In the diagram: 1. Base plate, 2. First pipe fastener, 3. Second pipe fastener, 4. Mounting plate, 5. Telescopic rod, 6. Sleeve, 7. Vertical plate, 8. First threaded rod, 9. Guide rod, 10. First motor, 11. Sleeve plate, 12. Moving plate, 13. Fixing block, 14. Second threaded rod, 15. Sliding rod, 16. Upper sliding rod, 17. Moving sleeve block, 18. Cross movable rod, 19. Moving wheel, 20. Second motor, 21. Semi-arc frame, 22. Semi-arc sliding groove, 23. Sliding block, 24. Electric trolley, 25. Welding torch, 26. End plate, 27. Bidirectional threaded rod, 28. Threaded sleeve block, 29. Movable connecting rod, 30. Contact block, 31. Limiting groove, 32. Limiting block, 33. Rotating block. Detailed Implementation

[0030] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0031] Reference Figures 1-6 A welding device for metal pipes in water conservancy construction includes a base plate 1, which is laid on the construction pit using mud nails. Above the base plate 1 are first pipe fasteners 2 and second pipe fasteners 3, distributed horizontally. The first and second pipe fasteners 2 and 3 are existing technologies, assembled and fastened to the pipes using bolts. The first pipe fastener 2 is fastened to the original metal pipe, and the second pipe fastener 3 is fastened to a new metal pipe. It should be noted that the original metal pipe is at a fixed height and requires no support. A welding mechanism is provided between the first pipe fastener 2 and the second pipe fastener 3. Mounting plates 4 are fixedly connected to the lower ends of both the first and second pipe fasteners 2 and 3. Four rectangularly distributed telescopic rods 5 are fixedly connected to the lower end of the mounting plate 4 on the left side. Four rectangularly distributed inserts 6 are fixedly connected to the upper end of the base plate 1. The telescopic ends of the four telescopic rods 5 are inserted into the corresponding inserts 6. The four telescopic rods 5 and the first pipe fastener 2 connect the original metal pipe to the base plate 1 and prevent the position of the original metal pipe from changing horizontally.

[0032] A moving mechanism is provided on the upper end of the base plate 1 and below the mounting plate 4 on the right side. The moving mechanism includes two upright plates 7 fixedly connected to the base plate 1 and distributed on the left and right. A first threaded rod 8 and a guide rod 9 are provided between the two upright plates 7. The first threaded rod 8 is rotatably connected to the two upright plates 7, and the guide rod 9 is fixedly connected to the two upright plates 7. A first motor 10 that drives the first threaded rod 8 to rotate is fixedly installed on the upright plate 7 on the right side. A sleeve plate 11 is sleeved on the first threaded rod 8 and the guide rod 9. The sleeve plate 11 is threadedly connected to the first threaded rod 8 and slidably connected to the guide rod 9. A moving plate 12 is fixedly connected to the upper end of the sleeve plate 11. Four moving wheels 19 that roll in contact with the base plate 1 are installed at the lower end of the moving plate 12. The moving wheels 19 provide support and do not affect the movement of the sleeve plate 11 and the moving plate 12 driven by the first motor 10.

[0033] Four rectangularly arranged fixing blocks 13 are fixedly connected to the upper end of the movable plate 12 and the lower end of the mounting plate 4 on the right side. A second threaded rod 14 is rotatably connected between two fixing blocks 13 on the right side of the movable plate 12. A sliding rod 15 is fixedly connected between two fixing blocks 13 on the left side of the movable plate 12. An upper sliding rod 16 is fixedly connected between every two corresponding fixing blocks 13 at the lower end of the mounting plate 4. The lifting component includes two coaxially arranged cross movable rods 18. The rear ends of the two cross movable rods 18 are rotatably connected to the four fixing blocks 13 on the rear side, and the front ends of the two cross movable rods 18 are rotatably connected to movable sleeve blocks 17. The four movable sleeve blocks 17... 7 are respectively sleeved on the second threaded rod 14, the lower sliding rod 15, and the upper sliding rod 16. The movable sleeve 17 is threadedly connected to the second threaded rod 14 and slidably connected to the lower sliding rod 15 and the upper sliding rod 16. A connecting rod is fixedly connected between every two left and right corresponding movable sleeves 17. A second motor 20 that drives the second threaded rod 14 to rotate is fixedly installed on one of the fixed blocks 13. The second motor 20 drives the second threaded rod 14 to rotate, which can drive the upper movable sleeve 17 to move back and forth. The four movable sleeves 17 move synchronously, so that the two cross movable rods 18 move crosswise, thereby driving the upper second pipe fastener 3 to rise and fall, so as to facilitate the movement of the new metal pipe to the same height position as the original metal pipe and maintain it.

[0034] The moving mechanism is connected to the mounting plate 4 located on the right side via a lifting component. The lifting mechanism is used to adjust the height of the new metal pipe so that it is consistent with the height of the original metal pipe, thereby using the moving mechanism to move its welding end to coincide with the welding end of the original metal pipe.

[0035] The welding mechanism includes a positioning ring fitted onto the new metal pipe. The positioning ring consists of two semi-circular frames 21 arranged vertically opposite each other and connected by bolts. Semi-circular grooves 22 are provided on the outer arc surfaces of the two semi-circular frames 21. The two semi-circular grooves 22 are interconnected to form an annular groove. A sliding block 23 is slidably connected inside the annular groove. When the two semi-circular frames 21 are assembled, the two semi-circular grooves 22 are connected, and the sliding block 23 can slide inside the annular groove formed by the two semi-circular grooves 22. An electric trolley 24 is fixedly installed at one end of the sliding block 23 outside the annular groove. The wheels of the electric trolley 24 roll in contact with the outer circumference of the positioning ring. The electric trolley 24 is existing technology and can be electrically driven to make it move in a circle around the positioning ring under the limiting action of the sliding block 23. The electric trolley 24 is equipped with a welding torch 25, which is existing technology. The welding torch 25 can move with the electric trolley 24, thereby making circular motion around the positioning ring, so that the welding work of the metal pipe ring weld can be carried out without rotating the metal pipe.

[0036] Two positioning and clamping mechanisms are provided on the inner arc surfaces of the two semi-arc frames 21. The four positioning and clamping mechanisms are evenly distributed circumferentially. Each positioning and clamping mechanism includes two end plates 26 that are fixedly connected to the inner wall of the semi-arc frame 21 and spaced apart from each other. A bidirectional threaded rod 27 is rotatably connected between the two end plates 26. Two threaded sleeve blocks 28 are threadedly sleeved on the bidirectional threaded rod 27 and arranged symmetrically from left to right. Movable connecting rods 29 are rotatably connected to the two threaded sleeve blocks 28. A contact block 30 is rotatably connected to the end of the two movable connecting rods 29 away from the threaded sleeve blocks 28. A limiting groove 31 is opened laterally on the inner wall of the semi-arc frame 21 at the corresponding position of each threaded sleeve block 28. A limiting block 32 is slidably connected in each limiting groove 31. The end of the limiting block 32 away from the limiting groove 31 is fixedly connected to the corresponding threaded sleeve block 28. The limiting block 32 and the limiting groove 31 play a limiting role, so that the threaded sleeve block 28 can only move along the limiting groove 31. One end of the bidirectional threaded rod 27 passes through the end plate 26 and is coaxially fixedly connected to a rotating block 33. By rotating the rotating block 33, the two threaded sleeve blocks 28 can be moved relative to each other through the bidirectional threaded rod 27. When the two threaded sleeve blocks 28 move relative to each other, the contact block 30 can be moved through the movable connecting rod 29.

[0037] The surface of the contact block 30 is provided with an arc-shaped rubber material. When the positioning ring is fitted onto the metal pipe, the four rotating blocks 33 can be rotated to make the four contact blocks 30 fit against the surface of the metal pipe, thereby fixing the positioning ring on the metal pipe and ensuring that the electric trolley 24 and welding torch 25 above can perform stable welding work.

[0038] A welding method for a metal pipe welding device used in water conservancy construction, comprising the following steps:

[0039] S1. First, excavate a construction pit at the welding end of the original metal pipe, lay the base plate 1 in the construction pit and fix it with mud nails. Then, fix the first pipe fastener 2 onto the original metal pipe and insert the four telescopic rods 5 into the four sockets 6. Then fix the second pipe fastener 3 onto the new metal pipe.

[0040] S2. Assemble the two semi-circular frames 21 near the welding end of the new metal pipe to form a positioning ring. By rotating each rotating block 33, make the four contact blocks 30 abut against the outer wall of the new metal pipe, so that the positioning ring is concentrically set with the new metal pipe. During the assembly process, slide the sliding block 23 in the semi-circular groove 22, and then complete the installation of the electric trolley 24 and the welding torch 25.

[0041] S3. The second motor 20 drives the lifting component to work, thereby driving the new metal pipe to rise and fall, so that the new metal pipe moves to the same height as the original metal pipe. Then, the first motor 10 drives the first threaded rod 8 to rotate, thereby using the moving mechanism to drive the new metal pipe toward the original metal pipe until the welding ends of the two contact and overlap, so that the weld formed remains stable.

[0042] S4. Adjust the welding torch 25 so that its welding head is aligned with the weld seam. Then, the electric trolley 24 moves along the annular slide, thereby driving the welding torch 25 to make a circular motion, thus completing the welding work of the two metal pipes.

[0043] S5. After welding is completed, the first pipe fastener 2, the second pipe fastener 3, the positioning ring and the base plate 1 can be disassembled and removed to proceed with the welding of the next section of the metal pipe.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A metal pipe welding device for water conservancy construction, comprising a base plate (1), characterized in that, The base plate (1) is provided with a first pipe fastener (2) and a second pipe fastener (3) distributed on the left and right sides. A welding mechanism is provided between the first pipe fastener (2) and the second pipe fastener (3). The lower ends of the first pipe fastener (2) and the second pipe fastener (3) are fixedly connected to an installation plate (4). The lower end of the installation plate (4) on the left side is fixedly connected to four telescopic rods (5) distributed in a rectangle. The base plate (1) is provided with a moving mechanism at the top and below the installation plate (4) on the right side. The moving mechanism is connected to the installation plate (4) on the right side through a lifting component. The first pipe fastener (2) is fastened to the original metal pipe, and the second pipe fastener (3) is fastened to the new metal pipe. The lifting mechanism is used to adjust the height of the new metal pipe so that it is consistent with the height of the original metal pipe. The moving mechanism is used to move its welding end to coincide with the welding end of the original metal pipe. The moving mechanism includes two upright plates (7) fixedly connected to the base plate (1) and distributed left and right. A first threaded rod (8) and a guide rod (9) are provided between the two upright plates (7). The first threaded rod (8) is rotatably connected to the two upright plates (7), and the guide rod (9) is fixedly connected to the two upright plates (7). A first motor (10) that drives the first threaded rod (8) to rotate is fixedly installed on the upright plate (7) on the right side. A sleeve plate (11) is sleeved on the first threaded rod (8) and the guide rod (9). The sleeve plate (11) is threadedly connected to the first threaded rod (8), and the sleeve plate (11) is slidably connected to the guide rod (9). A moving plate (12) is fixedly connected to the upper end of the sleeve plate (11), and four moving wheels (19) that roll in contact with the base plate (1) are installed at the lower end of the moving plate (12). Four rectangularly arranged fixing blocks (13) are fixedly connected to the upper end of the movable plate (12) and the lower end of the mounting plate (4) on the right side. A second threaded rod (14) is rotatably connected between the two fixing blocks (13) on the movable plate (12) and the two fixing blocks (13) on the movable plate (12) and the left side. A sliding rod (15) is fixedly connected between the two fixing blocks (13) on the lower end of the mounting plate (4). An upper sliding rod (16) is fixedly connected between every two corresponding fixing blocks (13) on the lower end of the mounting plate (4). The lifting component includes two coaxially arranged cross movable rods (18). (18) The rear end is rotatably connected to the four fixed blocks (13) on the rear side respectively. The front ends of the two cross movable rods (18) are rotatably connected to the movable sleeves (17). The four movable sleeves (17) are respectively sleeved on the second threaded rod (14), the lower sliding rod (15) and the upper sliding rod (16). The movable sleeves (17) are threadedly connected to the second threaded rod (14) and slidably connected to the lower sliding rod (15) and the upper sliding rod (16). A connecting rod is fixedly connected between each pair of left and right corresponding movable sleeves (17). A second motor (20) that drives the second threaded rod (14) to rotate is fixedly installed on one of the fixed blocks (13). The welding mechanism includes a positioning ring fitted on the new metal pipe. The positioning ring is composed of two semi-arc frames (21) arranged opposite each other. The two semi-arc frames (21) are connected by bolts. Semi-arc grooves (22) are provided on the outer arc surfaces of the two semi-arc frames (21). The two semi-arc grooves (22) are connected to each other to form an annular groove. A sliding block (23) is slidably connected in the annular groove. An electric trolley (24) is fixedly installed at one end of the sliding block (23) outside the annular groove. The wheels of the electric trolley (24) roll in contact with the outer circumferential surface of the positioning ring. A welding torch (25) is installed on the electric trolley (24). Two positioning clamping mechanisms are provided on the inner arc surfaces of the two semi-arc frames (21). The four positioning clamping mechanisms are evenly distributed circumferentially.

2. The metal pipe welding device for water conservancy construction according to claim 1, characterized in that, The upper end of the base plate (1) is fixedly connected to four rectangularly distributed inserts (6), and the telescopic ends of the four telescopic rods (5) are inserted into the corresponding inserts (6).

3. The metal pipe welding device for water conservancy construction according to claim 1, characterized in that, The positioning and clamping mechanism includes two end plates (26) fixedly connected to the inner wall of the semi-arc frame (21) and spaced apart from each other. A bidirectional threaded rod (27) is rotatably connected between the two end plates (26). Two threaded sleeves (28) are threadedly sleeved on the bidirectional threaded rod (27) and arranged symmetrically on the left and right. Movable connecting rods (29) are rotatably connected to the two threaded sleeves (28). A contact block (30) is rotatably connected to the end of the two movable connecting rods (29) away from the threaded sleeves (28). A limiting groove (31) is opened laterally on the inner wall of the semi-arc frame (21) and at the corresponding position of each threaded sleeve (28). A limiting block (32) is slidably connected in each limiting groove (31). The end of the limiting block (32) away from the limiting groove (31) is fixedly connected to the corresponding threaded sleeve (28). One end of the bidirectional threaded rod (27) passes through the end plate (26) and is coaxially fixedly connected to a rotating block (33).

4. The welding method of the metal pipe welding device for water conservancy construction according to claim 3, characterized in that, The steps are as follows: S1. Excavate a construction pit at the welding end of the original metal pipe in advance, lay the bottom plate (1) in the construction pit and fix it with mud nails. Then fix the first pipe fastener (2) onto the original metal pipe and insert the four telescopic rods (5) into the four sockets (6). Then fix the second pipe fastener (3) onto the new metal pipe. S2. Assemble the two semi-circular frames (21) near the welding end of the new metal pipe to form a positioning ring. By rotating each rotating block (33), make the four contact blocks (30) abut against the outer wall of the new metal pipe, so that the positioning ring is concentrically set with the new metal pipe. During the assembly process, slide the sliding block (23) in the semi-circular groove (22) and then complete the installation of the electric trolley (24) and the welding torch (25). S3. Drive the lifting component through the second motor (20) to lift the new metal pipe, so that the new metal pipe moves to the same height as the original metal pipe. Then drive the first threaded rod (8) to rotate through the first motor (10), so that the moving mechanism drives the new metal pipe to move toward the original metal pipe until the welding ends of the two are in contact and overlap, so that the weld formed remains stable. S4. Adjust the welding torch (25) so that its welding head is aligned with the weld seam. Then, the electric trolley (24) moves along the annular slide, thereby driving the welding torch (25) to make a circular motion, thus completing the welding work of the two metal pipes. S5. After welding is completed, the first pipe fastener (2), the second pipe fastener (3), the positioning ring and the base plate (1) can be disassembled and removed to carry out the welding work of the next section of metal pipe.

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