Auxiliary welding device for building steel pipes

Abstract

The invention provides an auxiliary welding device for building steel pipes, and relates to the technical field of building construction. Clamping seats are arranged at the two ends of the welding base respectively, one clamping seat is fixedly connected with the welding base, the lower end of the other clamping seat is in sliding tangency with the top of the welding base, two directional guide rods are perpendicularly arranged on the sliding clamping seat towards the fixed clamping seat, and the tail ends of the directional guide rods penetrate through the fixed clamping seat. The fixed clamping base and the sliding clamping base which are arranged at the two ends of the welding base are combined with the elastic reset mechanism (the directional guide rod, the alignment spring and the plug), and flexible compensation and pressure balance of steel pipe butt joint are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly relates to an auxiliary welding device for steel pipes used in buildings. Background Art

[0002] During the construction of building steel structures, the circumferential seam welding of steel pipes is a key process for pipe connection. In traditional welding operations, manual hand-held clamps are usually used to fix the steel pipes, and the butt joint position is adjusted by visual inspection before welding. This method has problems such as large coaxiality deviation of the steel pipes and uneven end face fitting, which are likely to cause defects such as weld porosity and lack of fusion. Especially in the construction of long-distance pipelines, the cumulative error of multiple sections of steel pipes will cause the overall axis to shift, seriously affecting the structural safety. Although existing mechanical welding devices can clamp steel pipes, most of them use rigid clamping mechanisms and lack a buffer compensation function during the butt joint of steel pipes. The hard collision of the end faces is likely to cause deformation of the steel pipe ports; moreover, the clamping structure is separated from the rotary drive system, and manual intervention is required to adjust the welding angle, making it difficult to ensure the continuity of circumferential seam welding. In addition, the conventional positioning device and the welding execution mechanism lack timing coordination, and there is often a slight displacement of the steel pipe after the positioning component is withdrawn, resulting in the deviation of the welding starting point and the need for repeated calibration. Summary of the Invention

[0003] The present invention relates to an auxiliary welding device for steel pipes used in buildings, aiming to solve the technical bottlenecks of low positioning accuracy, unstable welding quality, and high manual dependence in traditional processes.

[0004] The present invention provides an auxiliary welding device for steel pipes used in buildings, which specifically includes: a welding base; clamping seats are respectively arranged at both ends of the welding base, one of the clamping seats is fixedly connected to the welding base, the lower end of the other clamping seat is slidably tangent to the top of the welding base, two guiding rods are vertically arranged on the sliding clamping seat towards the fixed clamping seat, the ends of the guiding rods pass through the fixed clamping seat, plugs are arranged at the ends of the guiding rods, and alignment springs are sleeved on the guiding rods between the plugs and the fixed clamping seat; clamping blocks are symmetrically and slidably arranged on the clamping seats, and the two clamping blocks move towards each other to clamp the steel pipes, and the clamping blocks on the two clamping seats respectively clamp two butt-jointed steel pipes; a welding machine frame is longitudinally and fixedly installed on the welding base between the two clamping seats, a controller is fixedly installed at the front end of the welding machine frame, a welding cylinder is fixedly installed at one end of the top of the welding machine frame, the end of the piston rod of the welding cylinder is fixedly connected with a connecting block, and the connecting block is always slidably tangent to the upper end of the welding machine frame; a welding frame is fixedly installed at one end of the connecting block, and a positioning frame is fixedly installed at the other end.

[0005] Optionally, a double-headed lead screw is rotatably installed between the two ends of the top of the clamping seat. Two clamping blocks are respectively vertically screwed on the reverse threads of the double-headed lead screw. The lower end of the clamping block is slidably clamped with a T-rail fixedly arranged at the upper end of the clamping seat. One end of the clamping seat is fixedly provided with a synchronous motor for driving the double-headed lead screw to rotate. When the double-headed lead screw rotates, the two clamping blocks move synchronously towards each other to clamp the steel pipe, and move synchronously in opposite directions to loosen the steel pipe.

[0006] Optionally, arc-shaped support plates are fixedly arranged in the middle of the back-to-back ends of the two clamping seats, and the lower ends of the steel pipes to be welded are supported on the support plates.

[0007] Optionally, clamping rollers are respectively rotatably installed at the upper and lower ends of the two opposite clamping blocks, and the clamped steel pipe is located between the four clamping rollers. A rotating motor is fixedly installed on the clamping block at one of the clamping rollers, and the rotating shaft of the rotating motor is rotationally connected to the end rotating shaft of the adjacent clamping roller through a belt. When the rotating motor works, it drives the clamping rollers, and the clamping rollers drive the steel pipe in the clamped state to rotate for circumferential welding.

[0008] Optionally, a positioning blind plate is fixedly arranged at the upper end of the positioning frame towards the butt joint of the two steel pipes, and a fan-shaped arc-shaped attaching plate is arranged at the circumferential edge of the positioning blind plate and attached to the outer walls of the two steel pipes.

[0009] Optionally, a welding cantilever is horizontally fixedly arranged at the upper end of the welding frame towards the welding position. A welding head is fixedly arranged at one end of the welding cantilever towards the welding position. A contact seat is fixedly arranged on the welding cantilever. Two symmetric buffer rods are vertically slidably arranged at the upper and lower ends of the contact seat respectively. A contact wheel is rotatably connected between the ends of each group of buffer rods. The contact wheel is close to the steel pipe, and a buffer spring is sleeved on the buffer rod. When the welding frame follows the connecting block and moves towards the side where the steel pipe is located, the contact wheel contacts the steel pipe first, and then the welding head approaches the circumferential seam.

[0010] Optionally, when the two steel pipes are respectively fixed on the two clamping seats, the positioning blind plate of the positioning frame is at the butt joint of the two steel pipes. The piston rod of the welding cylinder is pushed out, the connecting block moves, and the positioning frame and the welding frame move synchronously. The positioning blind plate is withdrawn from between the two steel pipes. At the same time, under the action of the positioning spring, the sliding clamping seat moves, and the steel pipe on it moves closer to another steel pipe in a fixed state and is butted. The butted circumferential seam is aligned with the welding head, the contact wheel abuts against the steel pipe wall, and the welding head welds the circumferential seam.

[0011] The present invention provides an auxiliary welding device for building steel pipes, which has the following beneficial effects: In the present invention, the fixed clamping seats and sliding clamping seats arranged at both ends of the welding base are combined with an elastic reset mechanism (directional guide rod, alignment spring and plug), realizing flexible compensation and pressure balance for the butt joint of steel pipes. The sliding clamping seat slides precisely along the directional guide rod under the guidance of the elastic reset mechanism, eliminating the manual adjustment error and avoiding the deformation or deviation caused by the hard collision of the steel pipe end faces, ensuring the coaxiality of the circumferential seam butt joint and the uniformity of the end face fitting. The double-headed lead screw and the clamping block driven by the synchronous motor form a four-point clamping structure through the T-rail guidance. Combining with the rotational driving function of the clamping rollers, it not only realizes the stable fixation of the steel pipe, but also can drive the steel pipe to rotate uniformly by the rotating motor, enabling the welding head to continuously weld along the circumferential seam trajectory, and the weld uniformity is significantly better than that of traditional manual welding.

[0012] In the present invention, the linkage design of the positioning frame and the welding frame realizes the seamless connection of the positioning and welding actions through the sequential control of the welding cylinder. The fan-shaped attaching plate of the positioning blind plate is embedded in the butt joint gap of the steel pipe in the initial stage, and the radial pre-positioning is completed through the fitting of the circumferential edge with the outer wall of the steel pipe, ensuring the coincidence of the axes of the two steel pipes. When the welding cylinder pushes the connecting block, the withdrawal of the positioning blind plate and the elastic advancement of the sliding clamping seat are synchronized, which not only avoids the interference of the positioning components on the welding path, but also realizes the non-impact butt joint of the steel pipe end faces by using the elastic reset mechanism. The contact wheel of the welding frame forms an adaptive pressing mechanism with the buffer spring and the buffer rod, and abuts against the steel pipe surface in advance before the welding head contacts the circumferential seam, effectively absorbing mechanical vibration and axial deviation, ensuring the constant distance between the welding head and the circumferential seam, and improving the welding stability and the consistency of the penetration depth.

[0013] In addition, the design of the arc-shaped supporting plate simplifies the preliminary positioning process of the steel pipe. The operator only needs to place the steel pipe on the supporting plate, and the centering and clamping can be automatically completed by the clamping block, significantly reducing the labor intensity. The whole set of device coordinates the linkage actions of the synchronous motor, the rotating motor and the welding cylinder through the controller, realizing the full-process automatic operation from the steel pipe clamping, positioning and butt joint to the circumferential seam welding. It not only greatly shortens the welding cycle, but also reduces the dependence on skilled operators, and is especially suitable for the standardized welding requirements of a large number of steel pipes in the construction industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0015] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0016] In the drawings: Figure 1 The first axonometric structural schematic diagram of the present invention is shown; Figure 2 The second axonometric structural schematic diagram of the present invention is shown; Figure 3Shows the axonometric structural schematic diagram of the steel pipe removal state of the present invention; Figure 4 Shows the axonometric structural schematic diagram of the welding machine frame part of the present invention; Figure 5 Shows the Figure 4 Enlarged structure schematic diagram of part A in the present invention; Figure 6 Shows the axonometric structural schematic diagram of the separated state of the two clamping seats of the present invention; Figure 7 Shows the axonometric structural schematic diagram of the clamping seat and clamping block part of the present invention. Accompanying drawings

[0017] 1. Welding base; 2. Clamping seat; 201. Double-headed lead screw; 202. Synchronous motor; 203. Directional guide rod; 2031. Plug; 2032. Alignment spring; 204. Support plate; 3. Clamping block; 301. Clamping roller; 302. Rotating motor; 4. Welding machine frame; 401. Welding cylinder; 402. Connecting block; 5. Controller; 6. Positioning frame; 601. Positioning blind plate; 7. Welding frame; 701. Welding cantilever; 702. Welding head; 703. Contact seat; 704. Buffer rod; 705. Contact wheel; 706. Buffer spring; 8. Steel pipe. Detailed implementation manners

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0019] Example 1: Please refer to Figures 1 to 7 : The present invention provides an auxiliary welding device for steel pipes used in construction, comprising: a welding base 1; clamping seats 2 are respectively arranged at both ends of the welding base 1, one of the clamping seats 2 is fixedly connected to the welding base 1, and the lower end of the other clamping seat 2 is tangent to the top of the welding base 1 in a sliding manner. On the sliding clamping seat 2, two directional guide rods 203 are vertically arranged towards the fixed clamping seat 2. The ends of the directional guide rods 203 pass through the fixed clamping seat 2, and a plug 2031 is arranged at the end of the directional guide rod 203. A positioning spring 2032 is sleeved on the directional guide rod 203 between the plug 2031 and the fixed clamping seat 2; clamping blocks 3 are symmetrically and slidably arranged on the clamping seats 2, and the two clamping blocks 3 move towards each other to clamp the steel pipe 8, and the clamping blocks 3 on the two clamping seats 2 respectively clamp the two butt-jointed steel pipes 8; a welding machine frame 4 is longitudinally and fixedly installed on the welding base 1 between the two clamping seats 2, a controller 5 is fixedly installed at the front end of the welding machine frame 4, a welding cylinder 401 is fixedly installed at one end of the top of the welding machine frame 4, and the end of the piston rod of the welding cylinder 401 is fixedly connected with a connecting block 402, and the connecting block 402 is always tangent to the upper end of the welding machine frame 4 in a sliding manner; a welding frame 7 is fixedly installed at one end of the connecting block 402, and a positioning frame 6 is fixedly installed at the other end.

[0020] Wherein, a double-headed lead screw 201 is rotatably installed between the two ends at the top of the clamping seat 2, and the two clamping blocks 3 are respectively vertically screwed on the reverse screw threads of the double-headed lead screw 201. The lower end of the clamping block 3 is slidably clamped with a T-rail fixedly arranged at the upper end of the clamping seat 2. A synchronous motor 202 is fixedly arranged at one end of the clamping seat 2, and the synchronous motor 202 is used to drive the double-headed lead screw 201 to rotate. The rotation of the double-headed lead screw 201 drives the two clamping blocks 3 to move towards each other synchronously to clamp the steel pipe 8, and move away from each other synchronously to loosen the steel pipe 8.

[0021] Wherein, arc-shaped support plates 204 are fixedly arranged at the middle parts of the back-to-back ends of the two clamping seats 2, and the lower ends of the steel pipes 8 to be welded are supported on the support plates 204.

[0022] Wherein, clamping rollers 301 are respectively rotatably installed at the upper and lower ends of the two opposite clamping blocks 3, and the clamped steel pipe 8 is located between the four clamping rollers 301. A rotary motor 302 is fixedly installed on the clamping block 3 where one of the clamping rollers 301 is located, and the rotating shaft of the rotary motor 302 is rotationally connected to the end rotating shaft of the adjacent clamping roller 301 through a belt. When the rotary motor 302 works, it drives the clamping rollers 301, and the clamping rollers 301 drive the steel pipe 8 in the clamped state to rotate for circumferential welding.

[0023] Wherein, a positioning blind plate 601 is fixedly arranged at the upper end of the positioning frame 6 towards the butt-joint of the two steel pipes 8, and an arc-shaped attaching plate is arranged at the circumferential edge of the positioning blind plate 601 and attached to the outer walls of the two steel pipes 8.

[0024] Among them, a welding cantilever 701 is fixedly arranged at the upper end of the welding frame 7 horizontally towards the welding position. A welding head 702 is fixedly arranged at one end of the welding cantilever 701 towards the welding position. A contact seat 703 is fixedly arranged on the welding cantilever 701. Two symmetric buffer rods 704 are vertically slidably arranged at the upper and lower ends of the contact seat 703 respectively. A contact wheel 705 is rotatably connected between the ends of each group of buffer rods 704. The contact wheel 705 is close to the steel pipe 8. A buffer spring 706 is sleeved on the buffer rod 704. When the welding frame 7 moves towards the side where the steel pipe 8 is located following the connecting block 402, the contact wheel 705 contacts the steel pipe 8 first, and then the welding head 702 approaches the circumferential seam.

[0025] Embodiment 2: On the basis of Embodiment 1, when the two steel pipes 8 are respectively fixed on the two clamping seats 2, the positioning blind plate 601 of the positioning frame 6 is at the butt joint of the two steel pipes 8. The piston rod of the welding cylinder 401 is pushed out, the connecting block 402 moves, and the positioning frame 6 and the welding frame 7 move synchronously. The positioning blind plate 601 is withdrawn from between the two steel pipes 8. At the same time, under the action of the alignment spring 2032, the sliding clamping seat 2 moves, and the steel pipe 8 thereon moves closer to and butts against another steel pipe 8 in a fixed state. The circumferential seam of the butt joint is aligned with the welding head 702, the contact wheel 705 abuts against the pipe wall of the steel pipe 8, and the welding head 702 welds the circumferential seam.

[0026] The following is a further explanation and illustration of the structures and technical features in the above content: The welding base 1 serves as the load-bearing main body of the device, and the clamping seats 2 arranged at both ends constitute the steel pipe 8 clamping system. Among them, the fixed clamping seat 2 provides a stable reference end, and the sliding clamping seat 2 realizes horizontal displacement adjustment through the sliding fit between the bottom and the top of the welding base 1. The directional guide rod 203 arranged on the sliding clamping seat 2 passes through the fixed clamping seat 2, and the end plug 2031 and the alignment spring 2032 form an elastic reset mechanism, which provides a buffer compensation function during the butt joint process of the steel pipes 8 to ensure the pressure balance when the end faces of the two steel pipes 8 come into contact. The double-headed lead screw 201 is driven to rotate by the synchronous motor 202, so that the symmetrically arranged clamping blocks 3 move synchronously and reversely under the guidance of the T-rail, and a four-point clamping structure is formed by the upper and lower clamping rollers 301 (the rotating motor 302 drives one of the clamping rollers 301 through a belt). It can not only realize the stable clamping of the steel pipe 8, but also drive the steel pipe 8 to rotate around the axis by driving the clamping roller 301, providing a uniform motion basis for circumferential seam welding. The positioning frame 6 and the welding frame 7 form a linkage mechanism through the connecting block 402, and the welding cylinder 401 has a timing control characteristic when driven. The fan-shaped arc-shaped attaching plate of the positioning blind plate 601 is embedded in the butt joint gap of the two steel pipes 8 in the initial state, and the pre-positioning is realized through the fitting of its circumferential edge with the outer wall of the steel pipe 8. When the welding cylinder 401 pushes the connecting block 402, the withdrawal action of the positioning frame 6 and the elastic advancement of the sliding clamping seat 2 form a timing coordination: the counter-positioning spring 2032 releases elastic force to push the sliding clamping seat 2 to move towards the fixed end, and at the same time the positioning blind plate 601 withdraws from the butt joint area, so that the end faces of the steel pipes 8 are accurately aligned to form a welded circumferential seam. During this process, the contact wheel 705 of the welding frame 7 realizes adaptive pressing through the buffer rod 704 and the buffer spring 706. The contact wheel 705 contacts the surface of the steel pipe 8 first to form a buffer support, and then the welding head 702 on the welding cantilever 701 accurately aligns with the circumferential seam to complete the welding operation. The support plate 204 is used as the bottom support structure of the steel pipe 8, providing temporary support before the clamping action and reducing the difficulty of manual positioning. The whole set of devices realizes the full-process automatic operation of the welding process of the steel pipe 8 through the coordination of mechanical linkage and electrical control.

[0027] Working principle: The operator places the two steel pipes 8 to be welded on the arc-shaped support plates 204 of the two clamping seats 2 respectively. The support plates 204 provide temporary support for the steel pipes 8 to reduce the difficulty of manual positioning. Subsequently, the synchronous motor 202 drives the double-headed lead screw 201 to rotate, and drives the two clamping blocks 3 to move synchronously in opposite directions along the T-rail through the reverse threads. The clamping rollers 301 at the upper and lower ends of the clamping blocks 3 cover the steel pipe 8 from four directions to form a four-point clamping structure. At this time, the rotating motor 302 drives one of the clamping rollers 301 to rotate through the belt, so that the steel pipe 8 can rotate around its own axis under the clamped state.

[0028] After the preliminary fixation of the steel pipe 8 is completed, the positioning blind plate 601 of the positioning frame 6 is embedded in the butt joint gap of the two steel pipes 8, and its fan-shaped arc-shaped attaching plate is closely attached to the outer wall of the steel pipe 8 to realize the radial pre-positioning before welding. The controller 5 starts the welding cylinder 401, and the piston rod pushes the connecting block 402 to move towards the steel pipe 8 side, driving the positioning frame 6 and the welding frame 7 to displace synchronously. The positioning blind plate 601 withdraws from between the two steel pipes 8, and at the same time the sliding clamping seat 2 slides along the directional guide rod 203 towards the fixed clamping seat 2 under the elastic force of the counter-positioning spring 2032, so that the end faces of the two steel pipes 8 are accurately abutted to form a circumferential seam. During this process, the elastic reset mechanism restricts the displacement of the sliding clamping seat 2 through the plug 2031 to ensure the balance of the butt joint pressure.

[0029] When the welding frame 7 moves along with the connecting block 402, the buffer rod 704 of the contact seat 703 pushes the contact wheel 705 under the action of the buffer spring 706 to come into contact with the surface of the steel pipe 8 first, forming an adaptive pressing structure. When the welding head 702 of the welding cantilever 701 is aligned with the circumferential seam, the rotating motor 302 drives the steel pipe 8 to rotate at a constant speed, and the welding head 702 performs continuous welding along the circumferential seam trajectory. During the rotation of the steel pipe 8, the contact wheel 705 offsets mechanical vibration through rolling friction, and the buffer spring 706 absorbs the axial deviation during the welding process to ensure that the welding head 702 always maintains a stable distance from the circumferential seam. After the welding is completed, the synchronous motor 202 reverses to release the clamping block 3, and the operator takes out the welded part. The device resets under the action of the alignment spring 2032, completing the fully automated welding operation for the entire process.

[0030] In this article, the following points need to be noted: 1. The attached drawings of the embodiments of the present invention only relate to the structures involved in the embodiments of the present invention, and other structures can refer to the general design.

[0031] 2. Without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0032] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. An auxiliary welding device for steel pipes used in construction, comprising: Welding base (1); characterized in that clamping seats (2) are respectively arranged at both ends of the welding base (1), one of the clamping seats (2) is fixedly connected to the welding base (1), the lower end of the other clamping seat (2) is in sliding tangency with the top of the welding base (1), two directional guide rods (203) are vertically arranged on the sliding clamping seat (2) towards the fixed clamping seat (2), the ends of the directional guide rods (203) pass through the fixed clamping seat (2), a plug (2031) is arranged at the end of the directional guide rod (203), and a positioning spring (2032) is sleeved on the directional guide rod (203) between the plug (2031) and the fixed clamping seat (2); clamping blocks (3) are symmetrically and slidably arranged on the clamping seat (2), the two clamping blocks (3) move towards each other for clamping a steel pipe (8), and the clamping blocks (3) on the two clamping seats (2) respectively clamp two butt-jointed steel pipes (8); a welding machine frame (4) is longitudinally and fixedly installed on the welding base (1) between the two clamping seats (2), a controller (5) is fixedly installed at the front end of the welding machine frame (4), a welding cylinder (401) is fixedly installed at one end of the top of the welding machine frame (4), the end of the piston rod of the welding cylinder (401) is fixedly connected with a connecting block (402), and the connecting block (402) is always in sliding tangency with the upper end of the welding machine frame (4); a welding frame (7) is fixedly installed at one end of the connecting block (402), and a positioning frame (6) is fixedly installed at the other end.

2. The auxiliary welding device for steel pipes used in construction according to claim 1, characterized in that, A double-headed lead screw (201) is rotatably installed between the two ends of the top of the clamping seat (2), the two clamping blocks (3) are respectively vertically screwed on the reverse threads of the double-headed lead screw (201), the lower end of the clamping block (3) is slidably clamped with a T-rail fixedly arranged at the upper end of the clamping seat (2), a synchronous motor (202) is fixedly arranged at one end of the clamping seat (2), the synchronous motor (202) is used for driving the double-headed lead screw (201) to rotate, the rotation of the double-headed lead screw (201) drives the two clamping blocks (3) to move towards each other synchronously to clamp the steel pipe (8), and move away from each other synchronously to loosen the steel pipe (8).

3. An auxiliary welding device for steel pipes used in construction according to claim 1, characterized in that, Arc-shaped support plates (204) are fixedly arranged in the middle of the back ends of the two clamping seats (2), and the lower ends of the steel pipes (8) to be welded are supported on the support plates (204).

4. An auxiliary welding device for steel pipes used in construction according to claim 1, characterized in that, Clamping rollers (301) are respectively rotatably installed at the upper and lower ends of the two opposite clamping blocks (3), and the clamped steel pipe (8) is located between the four clamping rollers (301). A rotating motor (302) is fixedly installed on the clamping block (3) where one of the clamping rollers (301) is located, and the rotating shaft of the rotating motor (302) is rotationally connected with the end rotating shaft of the adjacent clamping roller (301) through a belt. When the rotating motor (302) works, it drives the clamping rollers (301), and the clamping rollers (301) drive the clamped steel pipe (8) to rotate for circumferential welding.

5. The auxiliary welding device for steel pipes used in construction according to claim 1, characterized in that, A positioning blind plate (601) is fixedly arranged at the upper end of the positioning frame (6) towards the butt-joint of the two steel pipes (8), and an arc-shaped attaching plate is arranged at the circumferential edge of the positioning blind plate (601) and attached to the outer walls of the two steel pipes (8).

6. The auxiliary welding device for steel pipes used in construction according to claim 1, wherein, At the upper end of the welding frame (7), a welding cantilever (701) is horizontally fixed towards the welding position. At one end of the welding cantilever (701) facing the welding position, a welding head (702) is fixed. A contact seat (703) is fixed on the welding cantilever (701). At the upper and lower ends of the contact seat (703), two symmetric buffer rods (704) are vertically slidably arranged. A contact wheel (705) is rotatably connected between the ends of each group of buffer rods (704). The contact wheel (705) is close to the steel pipe (8). A buffer spring (706) is sleeved on the buffer rod (704). When the welding frame (7) moves towards the side where the steel pipe (8) is located following the connecting block (402), the contact wheel (705) first contacts the steel pipe (8), and then the welding head (702) approaches the circumferential weld.

7. An auxiliary welding device for steel pipes used in construction according to claim 6, characterized in that, When the two steel pipes (8) are respectively fixed on the two clamping seats (2), the positioning blind plate (601) of the positioning frame (6) is at the butt joint of the two steel pipes (8). The piston rod of the welding cylinder (401) is pushed out, the connecting block (402) moves, and the positioning frame (6) and the welding frame (7) move synchronously. The positioning blind plate (601) is withdrawn from between the two steel pipes (8). At the same time, under the action of the alignment spring (2032), the sliding clamping seat (2) moves, and the steel pipe (8) thereon moves closer to the other steel pipe (8) in a fixed state and is butted. The circumferential weld of the butt joint is aligned with the welding head (702), the contact wheel (705) abuts against the pipe wall of the steel pipe (8), and the welding head (702) welds the circumferential weld.

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