A steel pipe welding device

Abstract

This invention relates to a steel pipe welding device, belonging to the field of steel pipe welding technology. The device includes a base plate, with a longitudinal driving mechanism disposed in the middle of the upper side of the base plate. A longitudinal slide block is slidably disposed on the longitudinal driving mechanism, a lower welding head is disposed at the bottom of the longitudinal slide block, and an upper welding head is disposed above the longitudinal slide block. Transverse driving mechanisms are fixedly disposed at both ends of the base plate, and clamping mechanisms are slidably disposed on the upper side of the transverse driving mechanisms. This invention, by setting up the longitudinal driving mechanism and the longitudinal slide block, enables the lower and upper welding heads to move automatically and stably along the longitudinal weld seam of the steel pipe, replacing the manual hand-held welding torch operation method. This significantly improves the welding speed and the uniformity of weld formation, ensuring the reliability of welding quality. The transverse driving mechanism, combined with a bidirectional screw drive, can drive the clamping mechanisms at both ends to move synchronously and in opposite directions, achieving rapid centering and clamping of steel pipes of different diameters.

Description

Technical Field

[0001] This invention belongs to the field of steel pipe welding technology, and specifically relates to a steel pipe welding device. Background Technology

[0002] In the production and engineering applications of steel pipes, it is often necessary to butt weld two semi-circular steel pipes along their longitudinal weld seams to form a complete circular pipe. Currently, such welding operations mostly adopt manual arc welding or semi-automatic welding methods. The operation process is roughly as follows: first, the two semi-circular steel pipes are positioned and spliced ​​by clamps or manual spot welding, and then welding is carried out segment by segment along the joint.

[0003] However, the aforementioned existing welding methods have many shortcomings in practical operation. First, the welding efficiency is low, manual operation depends on the welder's skill level, welding speed is limited, and the welding quality is unstable, making it difficult to meet the requirements of mass production or large-scale projects in terms of schedule and quality.

[0004] Secondly, welding deformation is difficult to control. When splicing semi-circular steel pipes, due to their insufficient cross-sectional stiffness, they are prone to radial shrinkage, excessive ellipticity, or longitudinal bending under the action of high-temperature thermal cycling and weld metal shrinkage stress during the welding process, which directly affects the dimensional accuracy and straightness of the final finished round pipe.

[0005] Secondly, the accuracy of assembly depends on manual labor. The positioning and centering of the two semicircles before welding (i.e., preventing "misalignment") is crucial, but existing simple clamping tools are unable to achieve accurate and rapid automatic centering and clamping, which can easily lead to excessive misalignment of the weld seam and affect the strength of the welded joint.

[0006] In addition, for steel pipes with thick walls or high requirements for welding quality, preheating before welding and slow cooling after welding are necessary process steps. However, existing simple devices usually do not have automatic heating functions and require additional heating equipment, which increases the complexity of operation and energy consumption.

[0007] Therefore, there is an urgent need to provide a welding device that can achieve automated clamping, precise centering, and efficient welding of semi-circular steel pipes, and can effectively control welding deformation and integrate preheating functions, in order to overcome the shortcomings of the existing technology. Summary of the Invention

[0008] The purpose of this invention is to provide a steel pipe welding device with a simple structure and reasonable design in order to solve the above-mentioned problems.

[0009] The present invention achieves the above objectives through the following technical solutions: A steel pipe welding device includes a base plate, a longitudinal driving mechanism is arranged in the middle of the upper side of the base plate, a longitudinal slide is slidably arranged on the longitudinal driving mechanism, a lower welding head is arranged at the bottom of the longitudinal slide, an upper welding head is arranged above the longitudinal slide, a transverse driving mechanism is fixedly arranged at both ends of the base plate, and a clamping mechanism is slidably arranged on the upper side of the transverse driving mechanism.

[0010] As a further optimization of the present invention, the longitudinal drive mechanism includes a longitudinal guide rail fixedly disposed in the middle of the base plate, a one-way lead screw rotatably disposed on the inner side of the longitudinal guide rail, a first servo motor for driving the one-way lead screw to rotate fixedly disposed at one end of the longitudinal guide rail, and a longitudinal slide block threadedly disposed on the outer side of the one-way lead screw and slidably disposed on the inner side of the longitudinal guide rail.

[0011] As a further optimization of the present invention, a first bracket is fixedly provided on one side of the longitudinal slide, the first bracket adopts an L-shaped structure, and the upper welding head is fixed on the first bracket.

[0012] As a further optimization of the present invention, a second bracket is fixedly provided on one side of the longitudinal slide, and a spiral heating tube sleeved on the outside of the steel pipe is fixedly provided on one side of the second bracket.

[0013] As a further optimization of the present invention, the transverse drive mechanism includes transverse guide rails fixedly disposed at both ends of the base plate, a bidirectional lead screw rotatably disposed on the inner side of the transverse guide rails, a second servo motor for driving the bidirectional lead screw to rotate fixedly disposed at one end of the transverse guide rails, and transverse slide blocks slidably connected to the inner side of the transverse guide rails at both ends of the bidirectional lead screws, and the clamping mechanism is fixedly disposed on the upper side of the transverse slide blocks.

[0014] As a further optimization of the present invention, the clamping mechanism includes a fixed column fixedly disposed on the upper side of the transverse slide, a rotating cylinder rotatably sleeved on the upper side of the fixed column, and a clamping assembly fixedly disposed on one side of the rotating cylinder.

[0015] As a further optimization of the present invention, the clamping assembly includes an arc-shaped plate fixedly disposed on one side of the rotating drum, a clamping screw threaded through one side of the arc-shaped plate, and an inner clamping plate disposed at one end of the clamping screw.

[0016] As a further optimization of the present invention, an outer clamping plate is fixedly provided on one side of the rotating drum, and the outer clamping plate adopts an arc-shaped structure.

[0017] The beneficial effects of this invention are as follows: 1. This invention, by setting a longitudinal drive mechanism and a longitudinal slide, enables the lower and upper welding heads to move automatically and stably along the longitudinal weld seam of the steel pipe, replacing the manual hand-held welding torch operation method. This significantly improves the welding speed and the uniformity and consistency of the weld formation, ensuring the reliability of the welding quality. The transverse drive mechanism, combined with bidirectional screw transmission, can drive the clamping mechanisms at both ends to move synchronously and in opposite directions, achieving rapid centering and clamping of steel pipes of different diameters. At the same time, the cooperation of the arc plate, clamping screw, inner clamping plate, and outer clamping plate in the clamping mechanism can tightly fit the inner and outer walls of the semi-circular steel pipe, effectively preventing the steel pipe from misaligning, loosening, or radially deforming during the welding process, ensuring the accuracy of the spliced ​​roundness.

[0018] 2. This invention achieves simultaneous welding of the inner and outer sides of the longitudinal joint of a semi-circular steel pipe by simultaneously setting an upper welding head above the weld and a lower welding head below the weld on a longitudinal slide. This double-sided simultaneous heating process makes the heat distribution in the weld area more uniform, significantly reduces welding residual stress and angular deformation, and helps to ensure the straightness and roundness of the finished steel pipe. By setting a spiral heating tube sleeved on the outside of the steel pipe on the longitudinal slide, the device integrates the functions of preheating before welding and slow cooling (or post-heating) after welding. This not only helps to remove moisture from the bevel area and reduce the hardening tendency, but also effectively prevents cold cracking, especially for welding alloy steel or thick-walled steel pipes, and improves the mechanical properties of the joint. At the same time, it eliminates the trouble of configuring additional heating equipment and simplifies the process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first overall structure of the present invention; Figure 2 This is a schematic diagram of the second overall structure of the present invention; Figure 3 This is the present invention. Figure 1 Enlarged view of point A in the middle; Figure 4 This is the present invention. Figure 2 Enlarged view of section B in the middle.

[0020] In the diagram: 1. Base plate; 2. Longitudinal drive mechanism; 201. Longitudinal guide rail; 202. One-way lead screw; 203. First servo motor; 3. Longitudinal slide; 4. Lower welding head; 5. First bracket; 6. Upper welding head; 7. Second bracket; 8. Spiral heating tube; 9. Lateral drive mechanism; 901. Lateral guide rail; 902. Two-way lead screw; 903. Second servo motor; 904. Lateral slide; 10. Clamping mechanism; 1001. Fixed column; 1002. Rotary drum; 1003. Arc plate; 1004. Clamping lead screw; 1005. Inner clamping plate; 1006. Outer clamping plate. Detailed Implementation

[0021] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0022] Example 1: As Figure 1 , Figure 2 As shown, a steel pipe welding device includes a horizontally placed base plate 1. A longitudinal drive mechanism 2 is arranged at the upper middle position of the base plate 1, and a longitudinal slide block 3 is slidably arranged on the longitudinal drive mechanism 2. A lower welding head 4 is fixedly installed at the bottom of the longitudinal slide block 3, and an upper welding head 6 is fixedly installed above the longitudinal slide block 3 via a first bracket 5. Transverse drive mechanisms 9 are fixedly arranged at both ends of the base plate 1, and a clamping mechanism 10 is slidably arranged on the upper side of each transverse drive mechanism 9.

[0023] During operation, the two semi-circular steel pipes to be welded are first placed in the clamping mechanisms 10 at both ends, and the clamping mechanisms 10 clamp and fix them tightly inside and out. Then, the transverse drive mechanism 9 drives the clamping mechanisms 10 at both ends to move towards each other, so that the longitudinal edges of the two semi-circular steel pipes are aligned and fitted together. Finally, the longitudinal drive mechanism 2 drives the longitudinal slide block 3 to move along the axial direction of the steel pipe, and at the same time starts the lower welding head 4 and the upper welding head 6 to simultaneously weld the longitudinal seams on both sides of the steel pipe.

[0024] like Figure 1 , Figure 2 As shown, the longitudinal drive mechanism 2 includes a longitudinal guide rail 201 fixedly disposed in the middle of the base plate 1, extending along the length direction of the base plate 1. A one-way lead screw 202 is rotatably disposed on the inner side of the longitudinal guide rail 201, and the axial direction of the one-way lead screw 202 is consistent with the extension direction of the longitudinal guide rail 201. A first servo motor 203 is fixedly disposed at one end of the longitudinal guide rail 201, and the output shaft of the first servo motor 203 is connected to one end of the one-way lead screw 202 through a coupling for driving the one-way lead screw 202 to rotate.

[0025] The bottom of the longitudinal slide block 3 is provided with a threaded hole, which is adapted to the external thread of the one-way lead screw 202. The longitudinal slide block 3 is threaded on the outside of the one-way lead screw 202, and the bottom of the longitudinal slide block 3 is slidably embedded in the inner groove of the longitudinal guide rail 201.

[0026] After the first servo motor 203 starts, it drives the one-way lead screw 202 to rotate. Under the transmission action of the lead screw and nut pair, the longitudinal slide 3 moves linearly back and forth along the longitudinal guide rail 201, thereby driving the upper welding head 6 and the lower welding head 4 to move smoothly and uniformly along the longitudinal seam of the steel pipe. By controlling the speed of the first servo motor 203, the welding speed can be precisely adjusted to adapt to the welding process requirements of steel pipes with different wall thicknesses and materials.

[0027] like Figure 1 , Figure 2 , Figure 4 As shown, a first support 5 is fixedly installed on one side of the longitudinal slide 3. The first support 5 has an L-shaped structure. Specifically, the lower end of the vertical section of the first support 5 is fixed to the side wall of the longitudinal slide 3, and the horizontal section of the first support 5 extends towards the steel pipe. The upper welding head 6 is fixedly installed at the end of the horizontal section of the first support 5, and the welding nozzle of the upper welding head 6 is directly opposite the upper longitudinal seam of the steel pipe. The lower welding head 4 is fixedly installed at the bottom of the longitudinal slide 3, and its welding nozzle is directly opposite the lower longitudinal seam of the steel pipe. The upper welding head 6 and the lower welding head 4 are arranged opposite each other in the vertical direction, and their welding directions are consistent, so as to achieve simultaneous welding of the upper and lower longitudinal seams on the outer side. A second support 7 is also fixedly installed on one side of the longitudinal slide 3. The second support 7 is located on the same side or opposite side of the longitudinal slide 3 as the first support 5. A spiral heating tube 8 is fixedly installed on one side of the second support 7. The spiral heating tube 8 adopts a resistance heating wire or an electromagnetic induction heating coil, and its inner diameter is larger than the outer diameter of the steel pipe to be welded, and it is sleeved on the outside of the steel pipe.

[0028] Before welding, the spiral heating tube 8 is activated to preheat the butt joint area of ​​the steel pipes. The preheating temperature can be set according to the material and wall thickness of the steel pipes; for example, for ordinary carbon steel, the preheating temperature is 150℃~250℃. During welding, the spiral heating tube 8 moves together with the longitudinal slide 3, continuously heating and maintaining the temperature of the weld and its heat-affected zone, which plays a role in slow cooling after welding, effectively preventing the formation of hardened structures and avoiding cold cracks.

[0029] like Figure 1 , Figure 2 As shown, the transverse drive mechanism 9 includes transverse guide rails 901 fixedly mounted at both ends of the base plate 1, with the transverse guide rails 901 symmetrically arranged on the base plate 1. A bidirectional lead screw 902 is rotatably mounted on the inner side of each transverse guide rail 901. The bidirectional lead screw 902 has two external threads with opposite directions of rotation, namely a left-hand thread section and a right-hand thread section, symmetrically distributed on both sides of the middle portion of the bidirectional lead screw 902. A second servo motor 903 is fixedly mounted at one end of each transverse guide rail 901, and the output shaft of the second servo motor 903 is connected to one end of the bidirectional lead screw 902 via a coupling. Transverse slide blocks 904 are threaded onto the left-hand and right-hand thread sections of the bidirectional lead screw 902, with the bottom of each transverse slide block 904 slidably embedded in a groove on the inner side of the transverse guide rail 901. A clamping mechanism 10 is fixedly mounted on the upper side of each transverse slide block 904.

[0030] After the second servo motor 903 starts, it drives the bidirectional lead screw 902 to rotate. Since the threads at both ends of the bidirectional lead screw 902 turn in opposite directions, the two transverse slides 904 move towards each other or away from each other along the transverse guide rail 901 simultaneously under the transmission action of the lead screw and nut pair. When the two transverse slides 904 move towards each other, the clamping mechanism 10 fixed on its upper side drives the two semi-circular steel pipes to approach each other and finally mate and press together; when they move away from each other, the finished steel pipe that has been welded is released, making it easier to unload.

[0031] like Figure 1 , Figure 2 , Figure 3 As shown, the clamping mechanism 10 includes a fixed column 1001 fixedly mounted on the upper side of the transverse slide 904, and the fixed column 1001 is vertically arranged. A rotating cylinder 1002 is rotatably sleeved on the upper side of the fixed column 1001, and the rotating cylinder 1002 can rotate freely around the axis of the fixed column 1001. A clamping assembly is fixedly mounted on one side of the rotating cylinder 1002, and the clamping assembly includes an arc-shaped plate 1003 fixedly mounted on one side of the rotating cylinder 1002, with the arc surface of the arc-shaped plate 1003 facing the direction of the semi-circular steel pipe to be clamped. A clamping screw 1004 is threaded through one side of the arc-shaped plate 1003, and the clamping screw 1004 is arranged radially along the arc-shaped plate 1003. An inner clamping plate 1005 is provided at one end of the clamping screw 1004, i.e., the end closest to the steel pipe, and the inner clamping plate 1005 adopts an arc-shaped structure, the curvature of which matches the curvature of the inner wall of the semi-circular steel pipe. The other end of the clamping screw 1004, that is, the end away from the steel pipe, is equipped with a screw handle or an internal hex head, which makes it easy for the operator to rotate and apply force.

[0032] Furthermore, an outer clamping plate 1006 is fixedly installed on one side of the rotating drum 1002. The outer clamping plate 1006 is positioned opposite to the arc-shaped plate 1003 and is located inside the arc-shaped plate 1003. The outer clamping plate 1006 also adopts an arc-shaped structure, and its curvature is adapted to the outer wall curvature of the semi-circular steel pipe.

[0033] When placing the semi-circular steel pipe, position the pipe between the outer clamping plate 1006 and the inner clamping plate 1005. Rotate the clamping screw 1004 clockwise, causing the inner clamping plate 1005 to move closer to the outer clamping plate 1006 until the inner clamping plate 1005 is tightly against the inner wall of the steel pipe and the outer clamping plate 1006 is tightly against the outer wall of the steel pipe, thus firmly clamping the semi-circular steel pipe. Rotate the clamping screw 1004 counterclockwise, causing the inner clamping plate 1005 to move away from the outer clamping plate 1006, releasing the steel pipe.

[0034] The rotating drum 1002 allows the clamped steel pipe to rotate on the fixed column 1001. In actual operation, when it is necessary to adjust the angle of the steel pipe, such as to repair a welded circumferential weld, or to perform circumferential inspection on the steel pipe, simply rotating the rotating drum 1002 will rotate the steel pipe to the required angle without re-clamping.

[0035] It should be noted that, at the start of operation, the two semi-circular steel pipes to be welded are placed in the clamping mechanisms 10 at both ends of the base plate 1. The clamping principle of each clamping mechanism 10 is as follows: Because the clamping screw 1004 is threaded through the arc-shaped plate 1003, and one end of it is connected to the inner clamping plate 1005, while the other end can be screwed on by the operator, when the clamping screw 1004 is screwed in the forward direction, under the action of the threaded transmission, the clamping screw 1004 drives the inner clamping plate 1005 to move linearly towards the outer clamping plate 1006. At this time, the wall of the semi-circular steel pipe is clamped between the inner clamping plate 1005 and the outer clamping plate 1006. Since both adopt an arc-shaped structure adapted to the curvature of the steel pipe, the inner clamping plate 1005 is tightly attached to the inner wall of the steel pipe, and the outer clamping plate 1006 is tightly attached to the outer wall of the steel pipe, thereby achieving double-sided clamping and fixing of the semi-circular steel pipe in the radial direction. This method can effectively prevent the steel pipe from radially loosening or misaligning during subsequent welding, ensuring the stability of the assembly reference. After the two semi-circular steel pipes are clamped by the clamping mechanisms 10 at both ends, the second servo motor 903 of the transverse drive mechanism 9 is activated. The second servo motor 903 drives the bidirectional lead screw 902 to rotate. The bidirectional lead screw 902 has two sections of external threads with opposite directions of rotation, a left-hand section and a right-hand section, which are threadedly engaged with the two transverse slides 904 respectively. Under the transmission principle of the lead screw and nut pair, when the bidirectional lead screw 902 rotates in one direction, the two transverse slides 904, guided by the transverse guide rail 901, will inevitably move synchronously in opposite directions along the guide rail.

[0036] As the two transverse slide blocks 904 approach each other, the clamping mechanism 10 fixed above them drives the semi-circular steel pipes they hold to move synchronously towards each other. When the longitudinal edges of the two semi-circular steel pipes, i.e. the welding surfaces, come into contact with each other and the set welding pressure is reached or the misalignment is less than the allowable value, the second servo motor 903 stops running and self-locks, thereby completing the transverse alignment and joining of the two semi-circular steel pipes.

[0037] After assembly, the first servo motor 203 of the longitudinal drive mechanism 2, as well as the upper welding head 6 and the lower welding head 4, are activated. Its working principle is as follows: The first servo motor 203 drives the one-way lead screw 202 to rotate. Since the longitudinal slide 3 is threaded on the outside of the one-way lead screw 202, and the longitudinal slide 3 is simultaneously constrained by the sliding guide of the longitudinal guide rail 201, the rotational motion of the one-way lead screw 202 is converted into the linear movement of the longitudinal slide 3 along the axis of the steel pipe.

[0038] During this process, since the upper welding head 6 is fixed above the longitudinal slide 3 via the L-shaped first bracket 5, and the lower welding head 4 is fixed to the bottom of the longitudinal slide 3, the upper welding head 6 and the lower welding head 4 move synchronously with the longitudinal slide 3 from one end of the steel pipe to the other at a uniform speed. Simultaneously, the upper welding head 6 welds the upper longitudinal seam formed by the butt joint of the two semi-circular steel pipes, and the lower welding head 4 welds the lower longitudinal seam. This arrangement enables simultaneous welding of both the inner and outer sides of the same longitudinal weld. The advantage of this principle is that the heat sources on both sides are applied to the weld area simultaneously, in the same direction, and at the same speed, resulting in a more balanced heat input to the weld metal in the thickness direction, effectively offsetting the angular deformation and bending deformation caused by uneven thermal expansion and contraction during single-sided welding.

[0039] Before and during welding, the spiral heating tube 8 plays a crucial auxiliary role. The spiral heating tube 8 is fixed to one side of the longitudinal slide block 3 by the second bracket 7 and is spirally sleeved on the outside of the steel pipe.

[0040] Once the device is started, the spiral heating tube 8 is energized and heats up, radiating heat to the butt joint area of ​​the steel pipe. Because the spiral heating tube 8 is fixedly connected to the longitudinal slide 3, it moves synchronously along the axial direction of the steel pipe with the longitudinal slide 3, thus providing continuous preheating and slow post-weld cooling to the weld and heat-affected zone. Its working principle is as follows: by raising the initial temperature of the weld area in advance, the temperature difference between the molten pool and the base material during welding is reduced, thereby lowering the peak welding stress; simultaneously, it slows down the post-weld cooling rate, preventing the formation of hardened structures and effectively improving the mechanical properties of the weld joint.

[0041] After welding is completed, if circumferential inspection or repair welding is required on the steel pipe, since the rotating drum 1002 in the clamping mechanism 10 is rotatably sleeved on the upper side of the fixed column 1001, the operator can directly rotate the rotating drum 1002. The rotating drum 1002 drives the arc plate 1003, the clamping screw 1004, the inner clamping plate 1005, the outer clamping plate 1006, and the clamped steel pipe as a whole to rotate around the axis of the fixed column 1001, thereby positioning the steel pipe at any angle and realizing circumferential displacement.

[0042] During unloading, the second servo motor 903 is started in reverse, and the bidirectional lead screw 902 rotates in reverse, driving the two transverse slides 904 to move synchronously in opposite directions, so that the finished steel pipe after welding is released from the clamping mechanism 10 at both ends. At the same time, the clamping lead screw 1004 is turned in reverse, the inner clamping plate 1005 moves backward, and the steel pipe is released, so that the finished steel pipe can be removed from the device.

[0043] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A steel pipe welding device, comprising a base plate (1), characterized in that: A longitudinal drive mechanism (2) is provided in the middle of the upper side of the base plate (1). A longitudinal slide block (3) is slidably provided on the longitudinal drive mechanism (2). A lower welding head (4) is provided at the bottom of the longitudinal slide block (3). An upper welding head (6) is provided above the longitudinal slide block (3). A transverse drive mechanism (9) is fixedly provided at both ends of the base plate (1). A clamping mechanism (10) is slidably provided on the upper side of the transverse drive mechanism (9).

2. The steel pipe welding device according to claim 1, characterized in that: The longitudinal drive mechanism (2) includes a longitudinal guide rail (201) fixedly disposed in the middle of the base plate (1), a one-way screw (202) rotatably disposed on the inner side of the longitudinal guide rail (201), a first servo motor (203) for driving the one-way screw (202) to rotate is fixedly disposed at one end of the longitudinal guide rail (201), and the longitudinal slide (3) is threaded on the outer side of the one-way screw (202) and slidably disposed on the inner side of the longitudinal guide rail (201).

3. The steel pipe welding device according to claim 2, characterized in that: A first bracket (5) is fixedly provided on one side of the longitudinal slide (3). The first bracket (5) adopts an L-shaped structure, and the upper welding head (6) is fixed on the first bracket (5).

4. The steel pipe welding device according to claim 2, characterized in that: A second bracket (7) is fixedly installed on one side of the longitudinal slide (3), and a spiral heating tube (8) sleeved on the outside of the steel pipe is fixedly installed on one side of the second bracket (7).

5. The steel pipe welding device according to claim 1, characterized in that: The transverse drive mechanism (9) includes transverse guide rails (901) fixedly mounted at both ends of the base plate (1). A bidirectional lead screw (902) is rotatably mounted on the inner side of the transverse guide rail (901). A second servo motor (903) for driving the bidirectional lead screw (902) to rotate is fixedly mounted at one end of the transverse guide rail (901). Both ends of the bidirectional lead screw (902) are threaded with transverse slide blocks (904) that are slidably connected to the inner side of the transverse guide rail (901). The clamping mechanism (10) is fixedly mounted on the upper side of the transverse slide block (904).

6. The steel pipe welding device according to claim 5, characterized in that: The clamping mechanism (10) includes a fixed column (1001) fixedly disposed on the upper side of the transverse slide (904), a rotating cylinder (1002) is rotatably sleeved on the upper side of the fixed column (1001), and a clamping assembly is fixedly disposed on one side of the rotating cylinder (1002).

7. A steel pipe welding device according to claim 6, characterized in that: The clamping assembly includes an arc-shaped plate (1003) fixedly disposed on one side of the rotating drum (1002), a clamping screw (1004) threaded through one side of the arc-shaped plate (1003), and an inner clamping plate (1005) disposed at one end of the clamping screw (1004).

8. A steel pipe welding device according to claim 7, characterized in that: An outer clamping plate (1006) is fixedly provided on one side of the rotating drum (1002), and the outer clamping plate (1006) adopts an arc-shaped structure.

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