A steel structure pipeline electric arc welding device

Abstract

The present application relates to the field of pipeline welding, and particularly relates to a steel structure pipeline electric arc welding device, which comprises two clamping pieces, a limiting piece, an adapter and two groups of driving pieces; the two clamping pieces are oppositely arranged with the open ends facing the same direction, the two side ends of the two clamping pieces are connected through two connecting pieces respectively, the inside of the clamping piece is provided with a cylindrical first mounting cavity, the open end of the clamping piece is provided with a through cavity, the through cavity is communicated with the first mounting cavity, and the width of the side of the through cavity away from the first mounting cavity is greater than the width of the side connected with the first mounting cavity; the limiting piece is inserted into one side of the clamping piece, and after the limiting piece moves along its own central axis, the end part is inserted into one side of the open end of the clamping piece, so that the open end of the clamping piece can be limited; the adapter is installed above the two clamping pieces, and the adapter is provided with an electric arc welding head; the two groups of driving pieces are installed on the two connecting pieces respectively, and the driving end of the driving piece is used for being attached to the surface of the pipeline in the first mounting cavity.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipeline welding, in particular to a steel structure pipeline arc welding device. BACKGROUND

[0002] In the fields of construction engineering, petrochemical industry, energy transportation, etc., the installation quality of steel structure pipeline directly affects the safety and reliability of system operation, and the equipment performance of welding process, as the core link of pipeline connection, is crucial.

[0003] At present, the mainstream steel structure pipeline welding method in the market is manual welding, and the traditional manual welding equipment relies on the welding gun held by the welder to perform arc welding operation. From the welding quality, manual welding completely depends on the operation experience of the welder, and it is difficult to accurately quantify the key parameters such as welding gun angle, moving speed and molten pool control; in terms of work efficiency, manual welding is limited to the limit of human function, and the daily effective welding time is usually not more than 6 hours, and the single welder daily welding pipeline length is about 30-40 meters; in terms of labor intensity and work environment adaptability, manual welders need to be exposed to the environment of arc radiation, high-temperature welding slag and PM2.5 concentration exceeding the standard for a long time, and the incidence of occupational diseases is high. In the face of large-diameter pipelines or space-limited three-dimensional welding scenes, manual welding is difficult to maintain a stable operating posture and often needs to set up complex scaffolding for assistance. SUMMARY

[0004] Therefore, it is necessary to provide a steel structure pipeline arc welding device aiming at the above technical problems, which can standardize the parameters, has higher work efficiency and welding quality, and better work environment adaptability. In the face of large-diameter pipelines or space-limited three-dimensional welding scenes, the rotating welding device can always maintain a stable posture without the need to set up complex scaffolding for assistance.

[0005] The present application provides a steel structure pipeline arc welding device, comprising:

[0006] Two clamping pieces are oppositely arranged with the opening ends facing the same direction, and the two sides of the two clamping pieces are connected by two connecting pieces. A cylindrical first mounting cavity is arranged in the clamping piece. A through cavity is opened in the opening end of the clamping piece, and the through cavity is in communication with the first mounting cavity. The width of the side of the through cavity away from the first mounting cavity is greater than the width of the side connected to the first mounting cavity.

[0007] A limiting piece is inserted into one side of the clamping piece. After moving along its own central axis, the end of the limiting piece is inserted into one side of the opening end of the clamping piece, so as to limit the opening end of the clamping piece.

[0008] An adapter is installed above the two clamping pieces, and an arc welding head is installed on the adapter.

[0009] Two groups of driving members are respectively arranged on the two connecting members, and driving ends of the driving members are located in the first mounting cavity and used for abutting with the surface of the pipeline in the first mounting cavity.

[0010] In an embodiment, the clamping member comprises a first bent plate, a second bent plate and a straight plate; the first bent plate is bent into a ring shape, and two ends of the first bent plate are not connected; one end of each of the two second bent plates is connected to one end of the first bent plate, and the second bent plate is bent away from the end of the first bent plate; the other end of the second bent plate is connected to the straight plate, and a limiting slot is formed in the end of the straight plate away from the second bent plate.

[0011] In an embodiment, two fixing frames are arranged on the two sides of the first bent plate respectively; the fixing frame is in a plate structure; the two ends of the fixing frame are bent towards the first bent plate and connected to the first bent plate; a first insertion hole is coaxially formed in the upper end surface and the lower end surface of the fixing frame; the limiting member is inserted into the first insertion hole; and the end of the limiting member can be inserted into the limiting slot.

[0012] In an embodiment, the fixing frame is located on the two sides of the upper half of the first mounting cavity; the limiting member comprises a first insertion rod and a limiting head; the first insertion rod is inserted into the first insertion hole; and the limiting head is arranged at the end of the first insertion rod away from the limiting slot.

[0013] In an embodiment, the connecting member is in an arc plate structure; the two ends of the connecting member are connected to the two first bent plates respectively; the two connecting members are symmetrically arranged on the left and right sides of the central axis of the mounting cavity; and the inner surface of the connecting member and the edge of the first mounting cavity are located on the same curved surface.

[0014] In an embodiment, the adapter comprises a cover plate; the two ends of the cover plate are overlapped on the upper end surfaces of the four fixing frames respectively; a plurality of heat dissipation slots are formed in the two ends of the upper surface of the cover plate; a mounting opening is arranged in the middle of the cover plate and used for mounting a fixed arc welding head; and the arc welding head is located directly above the first mounting cavity.

[0015] In an embodiment, the adapter further comprises a second insertion rod; the second insertion rod is arranged at the four corners of the lower surface of the cover plate; a second insertion hole is formed in the upper end surface of the fixing frame; the second insertion rod is inserted into the second insertion hole; a clamping groove is formed in the two side surfaces of the second insertion rod; and a resilient clamping member is clamped on the second insertion rod.

[0016] In one embodiment, the elastic clamping piece comprises a first bent rod, a second bent rod and a straight rod; the two ends of the first bent rod are bent towards the same direction, the two straight rods are coaxial with the central axis of the two ends of the first bent rod, the straight rod is connected with the end of the first bent rod through the second bent rod, and the two second bent rods are bent towards the same position.

[0017] In one embodiment, a through groove is formed on the connecting piece, the driving piece comprises a fixing box, a rotating rod and a rotating wheel; a second mounting cavity is formed in the inside of the fixing box, and the end of the fixing box facing the connecting piece is provided as an open structure; the rotating rod is transversely arranged in the second mounting cavity, the two ends of the rotating rod penetrate through the two sides of the fixing box, and the rotating wheel is sleeved on the rotating rod.

[0018] In one embodiment, the upper and lower ends of the fixing box are both provided as open structures, the upper and lower ends of the fixing box are both provided with a flange, one end of the flange is attached to the upper end or the lower end of the fixing box, the other end of the flange is bent and attached to the outer surface of the connecting piece, and the flange is fixedly connected with the connecting piece through a fastener.

[0019] The above steel structure pipeline electric arc welding device, in use, first extracts the two limiting pieces to avoid the end of the limiting piece from contacting the two sides of the opening end of the first bent plate, then aligns the opening end with the pipeline and applies pressure to the first bent plate, at this time, the opening end of the first bent plate abuts against the pipeline and is deformed, the width of the through cavity increases until the pipeline passes through the through cavity and is clamped in the first mounting cavity, at this time, the through cavity returns to the original position, after the limiting piece is inserted, the end of the limiting piece is clamped on the two sides of the opening end of the first bent plate to limit the opening end of the first bent plate. This structure arrangement makes the pipeline unable to be separated from the first mounting cavity no matter how the force is applied and in which direction, then adjusts the electric arc welding head on the adapter to the appropriate position, connects the electric arc welding head with the welding machine, and then starts the driving piece. The driving end of the driving piece penetrates through the connecting piece and is attached to the surface of the pipeline in the first mounting cavity, so as to drive the device to move around the central axis of the pipeline, thereby realizing welding of one circle of the pipeline. The electric arc welding device parameters can be standardized, the operation efficiency and welding quality are higher, and the operation environment adaptability is better. In the face of large-diameter pipelines or space-limited three-dimensional welding scenes, the rotating welding device can always maintain a stable posture without the need to set up a complex scaffold for assistance. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0021] Figure 1 The three-dimensional structural schematic diagram of the steel structure pipeline electric arc welding device provided by the present application is shown in the figure.

[0022] Figure 2 The inverted structural schematic diagram of the steel structure pipeline electric arc welding device provided by the present application is shown in the figure.

[0023] Figure 3 The planar structural schematic diagram of the steel structure pipeline electric arc welding device provided by the present application is shown in the figure.

[0024] Figure 4 The structural schematic diagram of the clamping piece and the connecting piece provided by the present application is shown in the figure.

[0025] Figure 5 The structural schematic diagram of the adapter provided by the present application is shown in the figure.

[0026] Figure 6 The structural schematic diagram of the elastic clamping piece provided by the present application is shown in the figure.

[0027] Figure 7 The installation state structural schematic diagram of the driving piece provided by the present application is shown in the figure.

[0028] Figure 8 The independent state structural schematic diagram of the driving piece provided by the present application is shown in the figure.

[0029] Reference signs:

[0030] 110, clamping piece; 111, first bent plate; 112, second bent plate; 113, straight plate; 1131, limiting groove; 120, connecting piece; 121, through groove; 130, first installation cavity; 140, through cavity; 200, fixing frame; 210, first insertion hole; 220, second insertion hole; 300, limiting piece; 310, first insertion rod; 320, limiting head; 400, adapter; 410, cover plate; 411, heat dissipation groove; 412, installation port; 420, second insertion rod; 421, clamping groove; 430, elastic clamping piece; 431, first bent rod; 432, second bent rod; 433, straight rod; 500, electric arc welding head; 600, driving piece; 610, fixing box; 611, second installation cavity; 620, folding plate; 630, rotating rod; 640, rotating wheel. DETAILED DESCRIPTION

[0031] 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. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The following is combined Figures 1 to 8 This invention describes an arc welding apparatus for steel structure pipes.

[0033] like Figures 1 to 3 As shown, in one embodiment, a steel structure pipe arc welding device includes two clamping members 110, a limiting member 300, a connecting member 400, and two sets of driving members 600. The two clamping members 110 are arranged opposite each other with their open ends facing the same direction. The two ends of the two clamping members 110 are connected by two connecting members 120 respectively. A columnar first mounting cavity 130 is provided inside the clamping member 110. A through cavity 140 is formed at the open end of the clamping member 110, which communicates with the first mounting cavity 130. The width of the through cavity 140 on the side away from the first mounting cavity 130 is greater than that of the first mounting cavity 130. The width of one side of the first mounting cavity 130 is connected; the limiting member 300 is inserted into one side of the clamping member 110. After the limiting member 300 moves along its own central axis, its end is inserted into one side of the opening end of the clamping member 110, which can limit the opening end of the clamping member 110; the adapter 400 is installed above the two clamping members 110, and an arc welding head 500 is installed on the adapter 400; two sets of driving members 600 are respectively installed on the two connecting members 120. The driving end of the driving member 600 is located in the first mounting cavity 130 and is used to fit with the pipe surface in the first mounting cavity 130.

[0034] The arc welding device for steel structure pipeline is used. Firstly, the two limiting members 300 are extracted to avoid the end of the limiting member 300 from contacting the two sides of the opening end of the first bent plate 111, then the opening end is opposite to the pipeline, and the pressure is applied to the first bent plate 111, at this time, the opening end of the first bent plate 111 abuts against the pipeline and is deformed, the width of the through cavity 140 is increased until the pipeline is clamped in the first mounting cavity 130, at this time, the through cavity 140 returns to the original position, after the limiting member 300 is inserted, the end of the limiting member 300 is clamped on the two sides of the opening end of the first bent plate 111, and the opening end of the first bent plate 111 is limited, the structure is arranged so that the pipeline cannot be separated from the first mounting cavity 130 no matter how the force is applied and in which direction, then the arc welding head 500 is adjusted to the appropriate position on the adapter 400, the arc welding head 500 is connected with the welding machine, then the driving member 600 is started, the driving end of the driving member 600 passes through the connecting member 120 and is located in the first mounting cavity 130 and is attached to the surface of the pipeline, so that the device can be driven to move around the central axis of the pipeline, so as to realize the welding of one circle of the pipeline. The arc welding device parameters can be standardized, the operation efficiency and welding quality are higher, and the operation environment adaptability is better. When facing large-diameter pipelines or space-limited three-dimensional welding scenes, the rotating welding device can always maintain a stable posture without the need to set up a complex scaffold for assistance.

[0035] As shown in Figure 4 , in one embodiment, the clamping member 110 includes a first bent plate 111, a second bent plate 112 and a straight plate 113; the first bent plate 111 is bent into a ring shape, and the two ends of the first bent plate 111 are not connected, one end of the two second bent plates 112 is connected to the two ends of the first bent plate 111 respectively, the second bent plate 112 is bent away from the end of the first bent plate 111, and the other end of the second bent plate 112 is connected with the straight plate 113, and the straight plate 113 is provided with a limiting groove 1131 away from one end of the second bent plate 112.

[0036] Specifically, the first bent plate 111, the second bent plate 112 and the straight plate 113 constitute a structure in the shape of a “ ” pattern, which has a columnar first mounting cavity 130 and a through cavity 140 in the shape of a trapezoidal structure, the top of the through cavity 140 is a part of the arc surface of the first mounting cavity 130, and the two sides of the through cavity 140 are two arc surfaces symmetrically arranged and curved towards the center of the opening end of the clamping member 110.

[0037] The top width of the through cavity 140 is less than the diameter of the first mounting cavity 130, the bottom width of the through cavity 140 is greater than the diameter of the first mounting cavity 130, and the three are integrally formed and have elasticity, so that when abutting against the surface of the pipeline, the second bent plate 112 will first deform, and since the straight plate 113 is arranged at the end of the second bent plate 112 away from the first bent plate 111, that is, the end with the maximum deformation, the limiting groove 1131 formed in the straight plate 113 is thick when the limiting member 300 is inserted, which can ensure the stability of the second bent plate 112 and stably clamp the pipeline in the first mounting cavity 130.

[0038] In one embodiment, two fixing frames 200 are arranged on the two sides of the first bent plate 111 respectively, the fixing frame 200 is in a plate-shaped structure, the two ends of the fixing frame 200 are bent towards the first bent plate 111 and connected with the first bent plate 111, coaxial first insertion holes 210 are formed in the upper end surface and the lower end surface of the fixing frame 200, and the limiting member 300 is inserted into the first insertion hole 210, and the end of the limiting member 300 can be inserted into the limiting groove 1131.

[0039] Specifically, the two fixing frames 200 arranged on the same first bent plate 111 can be regarded as a plate-shaped structure, which is horizontally overlapped on the first bent plate 111, and the two ends are vertically bent downwards, and then bent towards the first bent plate 111 after being bent to a certain distance, and finally connected to the first bent plate 111. The limiting member 300 includes a first insertion rod 310 and a limiting head 320, the first insertion rod 310 is inserted into the first insertion hole 210, and the limiting head 320 is arranged at the end of the first insertion rod 310 away from the limiting groove 1131.

[0040] In one embodiment, the fixing frame 200 is located on the two sides of the upper half of the first mounting cavity 130.

[0041] Specifically, since the first bent plate 111, the second bent plate 112 and the straight plate 113 are integrally formed and have elasticity, when deformed under stress, the deformation position of the second bent plate 112 is the largest, but at the same time, the end of the first bent plate 111 in contact with the second bent plate 112 will also be deformed. In order to avoid the deformation of the first bent plate 111 affecting the fixing frame 200, if the transverse diameter of the first mounting cavity 130 is regarded as a bisector and is extended, the bisector divides the first mounting cavity 130 into upper and lower parts, and the fixing frame 200 is located above the bisector, effectively reducing the influence of deformation.

[0042] In one embodiment, the connecting piece 120 is in an arc-shaped plate structure, the two ends of the connecting piece 120 are connected with two first bent plates 111 respectively, the two connecting pieces 120 are symmetrically arranged left and right around the central axis of the mounting cavity, and the inner surface of the connecting piece 120 and the edge of the first mounting cavity 130 are located on the same curved surface.

[0043] Specifically, the two clamping pieces 110 are oppositely arranged and have a space with one end not in contact with each other in the middle, and the two connecting pieces 120 are arranged in the space, and the two connecting pieces 120 are symmetrically arranged left and right, so that the upper part and the lower part of the first mounting cavity 130 are not blocked by external objects, the upper part directly faces the arc welding head 500, and the arc welding head 500 directly transmits the value to the first mounting cavity 130 to weld the pipeline, and the lower part is used for clamping the pipeline.

[0044] As shown in the drawings, Figure 5 In one embodiment, the adapter 400 includes a cover plate 410, which is overlapped on the upper end surface of the four fixing frames 200 at both ends, and a plurality of heat dissipation grooves 411 are formed at both ends of the upper surface of the cover plate 410, and a mounting port 412 is arranged in the middle of the cover plate 410 for mounting the arc welding head 500, and the arc welding head 500 is located directly above the first mounting cavity 130.

[0045] Specifically, the heat dissipation grooves 411 penetrate to the lower surface of the cover plate 410, and when the arc welding head 500 welds, a large amount of sparks, smoke and heat will be generated, and the plurality of heat dissipation grooves 411 arranged at both ends can effectively dissipate heat, avoiding heat accumulation caused by space closure, and the arc welding head 500 is connected with the external welding machine, and the connecting part is a hose, so that the device rotating around the pipeline for welding will not affect the arc welding head 500 or the welding machine.

[0046] In one embodiment, the adapter 400 further includes a second insertion rod 420; the second insertion rod 420 is arranged at the four corners of the lower surface of the cover plate 410, the upper end surface of the fixing frame 200 is provided with a second insertion hole 220, the second insertion rod 420 is inserted into the second insertion hole 220, and the two side surfaces of the second insertion rod 420 are provided with a clamping groove 421, and the second insertion rod 420 is provided with a elastic clamping piece 430.

[0047] Specifically, two second insertion holes 220 are formed in each fixing frame 200, and the two second insertion holes 220 are arranged in the direction of the central axis of the first mounting cavity 130, two second insertion rods 420 are arranged at the four corners of the lower surface of the cover plate 410, the two second insertion rods 420 are inserted into the two second insertion holes 220, the clamping groove 421 is arranged in an arc shape and penetrates the two sides of the two insertion rods in the direction of the central axis of the first mounting cavity 130.

[0048] As shown in the drawings, Figure 6 In one embodiment, the elastic clamping piece 430 includes a first bent rod 431, a second bent rod 432 and a straight rod 433; the two ends of the first bent rod 431 are bent towards the same direction, the two straight rods 433 coincide with the central axis of the two ends of the first bent rod 431, the straight rod 433 is connected with the end of the first bent rod 431 through the second bent rod 432, and the two second bent rods 432 are bent towards the same position.

[0049] Specifically, the first bent plate 111, the second bent plate 432 and the straight plate 433 are integrally formed and have elasticity, wherein the distance between the two straight plates 433 is the same as the distance between the two clamping grooves 421 on the two sides of the second insertion rod 420, and the distance between the two second bent plates 432 is less than the distance between the two clamping grooves 421. When installing, the elastic clamping piece 430 is inserted along the central axis direction of the first mounting cavity 130, and the second bent plate 432 abuts on the side of one second insertion rod 420 away from the other second insertion rod 420 after passing the two second insertion rods 420, thereby forming clamping and fixing.

[0050] As shown in Figure 7 and Figure 8 In one embodiment, a through groove 121 is formed on the connecting piece 120, and the driving piece 600 includes a fixed box 610, a rotating rod 630 and a rotating wheel 640. The inside of the fixed box 610 is provided with a second mounting cavity 611, and the end of the fixed box 610 facing the connecting piece 120 is provided with an open structure. The rotating rod 630 is transversely arranged in the second mounting cavity 611, and the two ends of the rotating rod 630 penetrate to the two sides of the fixed box 610. The rotating wheel 640 is sleeved on the rotating rod 630. The upper and lower ends of the fixed box 610 are both provided with an open structure, and the upper and lower ends of the fixed box 610 are both provided with a folding plate 620. One end of the folding plate 620 is attached to the upper end or the lower end of the fixed box 610, and the other end of the folding plate 620 is bent and attached to the outer surface of the connecting piece 120, and is fixedly connected with the connecting piece 120 through a fastener.

[0051] Specifically, the open end of the fixed box 610 is clamped in the through groove 121, and a motor is arranged inside or outside the fixed box 610. The motor is in transmission connection with the rotating rod 630, and is used to drive the rotating wheel 640 to rotate.

[0052] It should be noted that the motor in the present embodiment can be arranged in any position and in any way, as long as it can drive the rotating rod 630 to rotate. Therefore, the present embodiment will not be described in detail.

[0053] The technical features of the above-described embodiments can be combined in any way. In order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0054] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An arc welding device for steel structure pipelines, characterized in that, include: Two clamping members are arranged opposite each other with their opening ends facing the same direction. The two ends of the two clamping members are connected by two connectors. The clamping members have a columnar first mounting cavity inside. The opening end of the clamping members has a through cavity that communicates with the first mounting cavity. The width of the through cavity on the side away from the first mounting cavity is greater than the width on the side connected to the first mounting cavity. A limiting member is inserted into one side of the clamping member. After the limiting member moves along its own central axis, its end is inserted into one side of the opening end of the clamping member, which can limit the opening end of the clamping member. An adapter is mounted above the two clamping members, and an arc welding head is mounted on the adapter; Two sets of driving components are respectively installed on the two connecting components. The driving end of the driving component is located in the first mounting cavity and is used to fit against the pipe surface in the first mounting cavity. The clamping member includes a first bent plate, a second bent plate, and a straight plate; the first bent plate is bent into a ring shape, and the two ends of the first bent plate are not connected; one end of each of the two second bent plates is connected to the two ends of the first bent plate; the second bent plates are bent away from the ends of the first bent plates; the other end of the second bent plates is connected to the straight plate; a limiting groove is formed at the end of the straight plate away from the second bent plates. Two fixing frames are respectively provided on both sides of the first bent plate. The fixing frames are plate-shaped and both ends of the fixing frames are bent toward the first bent plate and connected to the first bent plate. The upper end face and the lower end face of the fixing frame are coaxially provided with a first insertion hole. The limiting member is inserted into the first insertion hole, and the end of the limiting member can be inserted into the limiting groove. The connector is arranged in an arc-shaped plate structure. The two ends of the connector are respectively connected to the two first bent plates. The two connectors are symmetrical about the central axis of the mounting cavity. The inner surface of the connector and the edge of the first mounting cavity are located on the same curved surface. The adapter includes a cover plate, the two ends of which overlap the upper surfaces of the four fixing frames. Multiple heat dissipation grooves are provided at both ends of the upper surface of the cover plate. An installation port is provided in the middle of the cover plate for installing and fixing an arc welding head. The arc welding head is located directly above the first mounting cavity. The adapter also includes a second insert rod; the second insert rod is located at the four corners of the lower surface of the cover plate, the upper end face of the fixing frame is provided with a second insertion hole, the second insert rod is inserted into the second insertion hole, the two sides of the second insert rod are provided with slots, and the second insert rod is secured with an elastic clip; The connector has a through groove, and the driving component includes a fixed box, a rotating rod, and a rotating wheel. The fixed box has a second mounting cavity inside, and the end of the fixed box facing the connector is set as an open structure. The rotating rod is arranged laterally in the second mounting cavity, and both ends of the rotating rod extend through to both sides of the fixed box. The rotating wheel is sleeved on the rotating rod.

2. The arc welding device for steel structure pipelines according to claim 1, characterized in that, The fixing frame is located on both sides of the upper half of the first mounting cavity. The limiting member includes a first insert rod and a limiting head. The first insert rod is inserted into the first insertion hole, and the limiting head is located at the end of the first insert rod away from the limiting groove.

3. The arc welding device for steel structure pipelines according to claim 2, characterized in that, The elastic clip includes a first bent rod, a second bent rod, and a straight rod; the two ends of the first bent rod bend in the same direction, the two straight rods coincide with the central axis of the two ends of the first bent rod, the straight rods are connected to the ends of the first bent rods through the second bent rods, and the two second bent rods bend to the same position.

4. The arc welding device for steel structure pipelines according to claim 3, characterized in that, The upper and lower ends of the fixing box are both designed as open structures. Both ends of the fixing box are provided with folding plates. One end of the folding plate is attached to the upper or lower end of the fixing box, and the other end of the folding plate is bent and attached to the outer surface of the connector, and is fixedly connected to the connector by fasteners.

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