Pipeline prefabrication welding bottoming inner hole welding equipment

Abstract

The utility model relates to the technical field of pipeline backing welding, in particular to pipeline prefabricated welding backing inner hole welding equipment which is used for prefabricated welding backing inner hole welding between a first pipeline and a second pipeline and comprises a welding mechanism and two supporting mechanisms, and the welding mechanism is used for prefabricated welding backing inner hole welding between the first pipeline and the second pipeline. The two supporting mechanisms are located on the two sides of the welding mechanism correspondingly, the supporting mechanisms are connected with the welding mechanism, and the two supporting mechanisms are used for supporting the inner wall of the first pipeline and the inner wall of the second pipeline correspondingly. The two supporting mechanisms are used for supporting the inner wall of the first pipeline and the inner wall of the second pipeline respectively, compared with an existing single-side supporting mode, the structure is simple, operation is convenient, the stability of the welding mechanism can be improved, and the welding effect of bottoming inner hole welding of the pipelines is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline bottom welding technical field especially a pipeline prefabricated welding bottoming inner hole welding equipment. BACKGROUND

[0002] Pipeline bottom welding refers to: before formally welding the pipeline, first welding is carried out to fill the gap between the end, provide stable support for subsequent welding, thereby preventing the pipeline deformation and gap too large, preventing the pipeline deformation due to welding stress, and can reduce the generation of welding crack, thereby improving the welding quality and the durability of the pipeline. The step of pipeline bottom welding is the key to ensure the welding quality and the safety of the pipeline, therefore, we urgently need a pipeline prefabricated welding bottoming inner hole welding equipment.

[0003] At present, pipeline bottoming inner hole welding is that the welding gun is inserted into the inside of the pipeline, and the pipeline bottoming inner hole welding is realized by rotating the pipeline or the welding gun, and the welding gun is supported on the inner wall of the pipeline through the supporting mechanism on the side of the welding gun insertion, however, since the supporting mechanism is only arranged on one side of the welding gun, only the pipeline on the side of the welding gun insertion can be kept stable, and the stability of the pipeline on the side of the welding gun not insertion cannot be ensured, thus, the welding effect of the pipeline bottoming inner hole welding is affected. UTILITY MODEL CONTENTS

[0004] The applicant provides a pipeline prefabricated welding bottoming inner hole welding equipment aiming at the defects in the above-mentioned existing production technology, and the welding effect of the pipeline bottoming inner hole welding can be improved through the improvement of the structure of the bottoming inner hole welding equipment.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A pipeline prefabricated welding bottoming inner hole welding equipment is used for prefabricated welding bottoming inner hole welding between a first pipeline and a second pipeline, and comprises a welding mechanism and two supporting mechanisms, the welding mechanism is used for prefabricated welding bottoming inner hole welding between the first pipeline and the second pipeline, the two supporting mechanisms are respectively located on the two sides of the welding mechanism, and the supporting mechanisms are connected with the welding mechanism, and the two supporting mechanisms are respectively used for supporting the inner wall of the first pipeline and the inner wall of the second pipeline.

[0007] Therefore, the inner wall of the first pipeline and the inner wall of the second pipeline are supported by the two supporting mechanisms respectively, compared with the existing single side supporting mode, the mode has simple structure and is convenient to operate, and the stability of the welding mechanism can be improved, so that the welding effect of the pipeline bottoming inner hole welding is improved.

[0008] As a further improvement of the above technical solution: further comprising: a driving mechanism, the welding mechanism is connected with the driving end of the driving mechanism, the driving mechanism is used for driving the welding mechanism to move along the Z-axis direction, so that the welding mechanism is aligned with the center of the first pipe and the center of the second pipe, the driving mechanism is also used for driving the welding mechanism to move along the Y-axis direction, so that the welding mechanism is aligned with the connection between the first pipe and the second pipe; the support mechanism close to the driving mechanism side is fixedly connected with the welding mechanism, and the support mechanism away from the driving mechanism side is rotatably connected with the welding mechanism.

[0009] As a further improvement of the above technical solution: the welding mechanism comprises: a first driving member, a rotating rod, a first fixed block, a second driving member and a welding gun, the first driving member is connected with the driving end of the driving mechanism through a second fixed block, one end of the first driving member is connected with one end of the rotating rod, the first fixed block is sleeved on the rotating rod and is fixedly connected with the rotating rod, the second driving member is connected with the first fixed block, the welding gun is connected with the driving end of the second driving member, the rotating rod is used for driving the welding gun to rotate along the radial end face of the first pipe or the second pipe, and the second driving member is used for driving the welding gun to move along the radial direction of the first pipe or the second pipe; the support mechanism close to the driving mechanism side is fixedly connected with the first driving member, and the support mechanism away from the driving mechanism side is rotatably connected with the other end of the rotating rod. Thus, the first driving member drives the welding gun to rotate to preform the welding bottom hole welding between the first pipe and the second pipe; the second driving member drives the welding gun to move, so that the output end of the welding gun is in contact with the connection between the first pipe and the second pipe.

[0010] As a further improvement of the above technical solution: the welding gun is provided with two, the two welding guns are oppositely arranged, and the welding gun corresponds to the second driving member one by one. Thus, through the design of the two welding guns, the welding gun only needs to rotate 180° to complete the preform welding bottom hole welding between the first pipe and the second pipe, without rotating 360°, so as to improve the welding efficiency of the preform welding bottom hole welding between the first pipe and the second pipe.

[0011] As a further improvement of the above technical solution: the supporting mechanism comprises a third fixed block, a third driving member and an arc-shaped supporting block, the third driving member is installed on the outer circumferential surface of the third fixed block, the arc-shaped supporting block is connected with the driving end of the third driving member, and the third driving member is used to drive the arc-shaped supporting block to move along the radial direction of the first pipe or the second pipe, so that the side surface of the arc-shaped supporting block away from the driving end of the third driving member is attached to the inner wall of the first pipe or the second pipe. Thus, the arc-shaped supporting block is moved by the third driving member to be attached to the inner wall of the first pipe or the second pipe, so as to support the first pipe or the second pipe.

[0012] As a further improvement of the above technical solution: a plurality of arc-shaped supporting blocks are provided, the plurality of arc-shaped supporting blocks are distributed in a ring shape at equal intervals, and the arc-shaped supporting blocks correspond one-to-one to the third driving members. Thus, by providing a plurality of arc-shaped supporting blocks, the supporting effect of the first pipe and the second pipe is improved.

[0013] As a further improvement of the above technical solution: the driving mechanism comprises a fourth driving member and a fifth driving member, the driving end of the fourth driving member is connected with the fifth driving member through a fourth fixed block, the driving end of the fifth driving member is connected with the second fixed block, the fourth driving member is used to drive the welding mechanism to move along the Z-axis direction, and the fifth driving member is used to drive the welding mechanism to move along the Y-axis direction. Thus, the welding mechanism is moved along the Z-axis direction by the fourth driving member, so that the welding mechanism is aligned with the center of the first pipe and the center of the second pipe, ensuring that the movement of the welding gun is circular when the inner hole is primed and welded; the welding mechanism is moved along the Y-axis direction by the fifth driving member, so that the welding mechanism is aligned with the connection between the first pipe and the second pipe, ensuring that the output end of the welding gun can contact the connection between the first pipe and the second pipe, and further ensuring that the welding gun acts on the connection between the first pipe and the second pipe.

[0014] As a further improvement of the above technical solution: further comprising two fixed mechanisms, and the two fixed mechanisms are respectively used to fix the first pipe and the second pipe. Thus, the outer wall of the first pipe and the second pipe can be fixed by the fixed mechanism, and the stability of the welding mechanism is further ensured in cooperation with the support of the inner wall of the first pipe and the second pipe by the supporting mechanism, so that the welding mechanism remains stable relative to the first pipe and the second pipe.

[0015] As a further improvement of the above technical solution: the fixing mechanism comprises: a first arc-shaped fixing block, a second arc-shaped fixing block, a threaded rod and a locking piece, the first arc-shaped fixing block is located below the first pipeline and the second pipeline, the second arc-shaped fixing block is located above the first pipeline and the second pipeline, the first arc-shaped fixing block and the second arc-shaped fixing block abut the outer circumferential surface of the first pipeline or the second pipeline close to the side surface of the first pipeline and the second pipeline, one end of the threaded rod is connected with the first arc-shaped fixing block, the other end of the threaded rod penetrates through the second arc-shaped fixing block, and the locking piece is located on the side of the second arc-shaped fixing block away from the first arc-shaped fixing block and is threadedly connected with the other end of the threaded rod; a plurality of threaded rods are arranged, and the threaded rods are located at two ends of the first arc-shaped fixing block respectively, and the locking piece corresponds to the threaded rod one by one.

[0016] As a further improvement of the above technical solution: further comprising: a workbench, the fourth driving member and the side of the first arc-shaped fixing block away from the first pipeline or the second pipeline are connected with the first pipeline.

[0017] The beneficial effects of the present application are as follows:

[0018] Through the two supporting mechanisms supporting the inner walls of the first pipeline and the second pipeline respectively, compared with the existing single-side supporting mode, the mode has simple structure, is convenient to operate, can improve the stability of the welding mechanism, and can improve the welding effect of the pipeline backing inner hole welding.

[0019] The present application also has the following advantages:

[0020] 1. The welding gun only needs to be rotated by 180° to complete the prefabricated welding backing inner hole welding between the first pipeline and the second pipeline, without the need to rotate by 360°, so as to improve the welding efficiency of the prefabricated welding backing inner hole welding between the first pipeline and the second pipeline.

[0021] 2. The present application sets a plurality of arc-shaped supporting blocks to improve the supporting effect of the first pipeline and the second pipeline.

[0022] 3. The fixing mechanism can fix the outer walls of the first pipeline and the second pipeline, and in cooperation with the supporting mechanism supporting the inner walls of the first pipeline and the second pipeline, the stability of the welding mechanism is further ensured, so that the welding mechanism remains stable relative to the first pipeline and the second pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic view of the pipeline prefabricated welding backing inner hole welding equipment of the present application.

[0024] Figure 2 Structure schematic view of the welding mechanism, the supporting mechanism and the driving mechanism of the utility model;

[0025] Figure 3 Structure schematic view of the welding mechanism of the utility model;

[0026] Figure 4 Structure schematic view of the supporting mechanism of the utility model;

[0027] Figure 5 Structure schematic view of the driving mechanism of the utility model;

[0028] Figure 6 Structure schematic view of the fixing mechanism of the utility model;

[0029] Figure 7 Effect diagram of prefabricated welding base hole welding between the first pipeline and the second pipeline of the utility model;

[0030] Figure 8 Partial sectional view of prefabricated welding base hole welding between the first pipeline and the second pipeline of the utility model;

[0031] Figure 9 Partial front view of prefabricated welding base hole welding between the first pipeline and the second pipeline of the utility model.

[0032] 1, the first pipeline;

[0033] 2, the second pipeline;

[0034] 3, the welding mechanism;

[0035] 301, the first driving piece; 302, the rotating rod; 303, the first fixed block; 304, the second driving piece; 305, the welding gun; 306, the second fixed block;

[0036] 4, the supporting mechanism;

[0037] 401, the third fixed block; 402, the third driving piece; 403, the arc-shaped supporting block;

[0038] 5, the driving mechanism;

[0039] 501, the fourth driving piece; 502, the fifth driving piece; 503, the fourth fixed block;

[0040] 6, the fixing mechanism;

[0041] 601, the first arc-shaped fixed block; 602, the second arc-shaped fixed block; 603, the threaded rod; 604, the locking piece;

[0042] 7, the workbench. Detailed Implementation

[0043] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0044] like Figures 1 to 9 The diagram shows the preferred embodiment of this utility model. This embodiment's pipe prefabrication welding and root pass inner hole welding equipment is used for prefabrication welding and root pass inner hole welding between a first pipe 1 and a second pipe 2. It includes a welding mechanism 3 and two support mechanisms 4. The welding mechanism 3 is used for prefabrication welding and root pass inner hole welding between the first pipe 1 and the second pipe 2. The two support mechanisms 4 are located on both sides of the welding mechanism 3 and are connected to it. The two support mechanisms 4 are used to support the inner walls of the first pipe 1 and the second pipe 2, respectively. Therefore, by using two support mechanisms 4 to support the inner walls of the first pipe 1 and the second pipe 2, compared to the existing single-sided support method, this method has a simpler structure, is easier to operate, and can improve the stability of the welding mechanism 3, thereby improving the welding effect of the pipe root pass inner hole welding.

[0045] In other words, since the two support mechanisms 4 support the inner walls of the first pipe 1 and the second pipe 2 respectively, the welding mechanism 3 remains relatively stable with the first pipe 1 and the second pipe 2 during the root pass welding. This ensures the consistency of the welding effect at each position of the root pass welding at the connection between the first pipe 1 and the second pipe 2, thereby improving the welding effect of the pipe root pass welding.

[0046] In the embodiment, the welding mechanism 3 is connected with a driving end of a driving mechanism 5, the driving mechanism 5 is used to drive the welding mechanism 3 to move along the Z-axis direction so that the welding mechanism 3 is aligned with the center of the first pipe 1 and the center of the second pipe 2, and the driving mechanism 5 is also used to drive the welding mechanism 3 to move along the Y-axis direction so that the welding mechanism 3 is aligned with the connection between the first pipe 1 and the second pipe 2; a support mechanism 4 close to the driving mechanism 5 is fixedly connected with the welding mechanism 3, and a support mechanism 4 far from the driving mechanism 5 is rotatably connected with the welding mechanism 3; the driving mechanism 5 comprises a fourth driving member 501 and a fifth driving member 502, a driving end of the fourth driving member 501 is connected with the fifth driving member 502 through a fourth fixed block 503, and a driving end of the fifth driving member 502 is connected with the second fixed block 306; the fourth driving member 501 is used to drive the welding mechanism 3 to move along the Z-axis direction, and the fifth driving member 502 is used to drive the welding mechanism 3 to move along the Y-axis direction. Thus, the fourth driving member 501 is used to drive the welding mechanism 3 to move along the Z-axis direction so that the welding mechanism 3 is aligned with the center of the first pipe 1 and the center of the second pipe 2, and the movement of the welding gun 305 is ensured to be circular when the inner hole is primed and welded; the fifth driving member 502 is used to drive the welding mechanism 3 to move along the Y-axis direction so that the welding mechanism 3 is aligned with the connection between the first pipe 1 and the second pipe 2, and the output end of the welding gun 305 is ensured to be in contact with the connection between the first pipe 1 and the second pipe 2, and the welding gun 305 is ensured to act on the connection between the first pipe 1 and the second pipe 2.

[0047] For example, the fourth driving member 501 and the fifth driving member 502 are both air cylinders.

[0048] In the embodiment, the welding mechanism 3 comprises a first driving member 301, a rotating rod 302, a first fixed block 303, a second driving member 304 and a welding gun 305. The first driving member 301 is connected with the driving end of the driving mechanism 5 through a second fixed block 306. The driving end of the first driving member 301 is connected with one end of the rotating rod 302. The first fixed block 303 is sleeved on the rotating rod 302 and is fixedly connected with the rotating rod 302. The second driving member 304 is connected with the first fixed block 303. The welding gun 305 is connected with the driving end of the second driving member 304. The rotating rod 302 is used for driving the welding gun 305 to rotate along the radial end face of the first pipe 1 or the second pipe 2. The second driving member 304 is used for driving the welding gun 305 to move along the radial direction of the first pipe 1 or the second pipe 2. The support mechanism 4 close to the driving mechanism 5 is fixedly connected with the first driving member 301. The support mechanism 4 far away from the driving mechanism 5 is rotationally connected with the other end of the rotating rod 302. The welding gun 305 is provided in two, the two welding guns 305 are oppositely arranged, and the welding gun 305 corresponds to the second driving member 304 one by one. Thus, the first driving member 301 is used for driving the welding gun 305 to rotate, so as to perform the prefabricated welding of the inner hole of the first pipe 1 and the second pipe 2. The second driving member 304 is used for driving the welding gun 305 to move, so that the output end of the welding gun 305 is in contact with the connection position of the first pipe 1 and the second pipe 2. The two welding guns 305 are designed to be rotated by 180°, so as to complete the prefabricated welding of the inner hole of the first pipe 1 and the second pipe 2, without rotating by 360°, so as to improve the welding efficiency of the prefabricated welding of the inner hole of the first pipe 1 and the second pipe 2.

[0049] For example, the first driving member 301 is a motor, and the second driving member 304 is a cylinder.

[0050] In this embodiment, the support mechanism 4 includes: a third fixing block 401, a third driving member 402, and an arc-shaped support block 403. The third driving member 402 is installed on the outer peripheral surface of the third fixing block 401. The arc-shaped support block 403 is connected to the driving end of the third driving member 402. The third driving member 402 is used to drive the arc-shaped support block 403 to move along the radial direction of the first pipe 1 or the second pipe 2, so that the side of the arc-shaped support block 403 away from the driving end of the third driving member 402 fits against the inner wall of the first pipe 1 or the second pipe 2. A plurality of arc-shaped support blocks 403 are provided, and the plurality of arc-shaped support blocks 403 are distributed in a ring with equal spacing. The arc-shaped support blocks 403 correspond one-to-one with the third driving member 402. Therefore, the arc-shaped support block 403 is moved by the third driving component 402 so that the arc-shaped support block 403 fits against the inner wall of the first pipe 1 and the inner wall of the second pipe 2 to support the first pipe 1 and the second pipe 2; by setting multiple arc-shaped support blocks 403, the support effect of the first pipe 1 and the second pipe 2 is improved.

[0051] For example, the third drive component 402 uses a cylinder.

[0052] In this embodiment, it further includes two fixing mechanisms 6, which are used to fix the first pipe 1 and the second pipe 2 respectively. Each fixing mechanism 6 includes a first arc-shaped fixing block 601, a second arc-shaped fixing block 602, a threaded rod 603, and a locking member 604. The first arc-shaped fixing block 601 is located below the first pipe 1 and the second pipe 2, and the second arc-shaped fixing block 602 is located above the first pipe 1 and the second pipe 2. The first arc-shaped fixing block 601 and the second arc-shaped fixing block 602 are close to the first pipe 1 and the second pipe 2. The side of pipe 2 abuts against the outer circumference of the first pipe 1 or the second pipe 2. One end of the threaded rod 603 is connected to the first arc-shaped fixing block 601, and the other end of the threaded rod 603 passes through the second arc-shaped fixing block 602. The locking member 604 is located on the side of the second arc-shaped fixing block 602 away from the first arc-shaped fixing block 601 and is threadedly connected to the other end of the threaded rod 603. Multiple threaded rods 603 are provided, and multiple threaded rods 603 are respectively located at both ends of the first arc-shaped fixing block 601. The locking member 604 corresponds to each threaded rod 603. Thus, the fixing mechanism 6 can fix the outer wall of the first pipe 1 and the second pipe 2, and with the support mechanism 4 supporting the inner wall of the first pipe 1 and the second pipe 2, the stability of the welding mechanism 3 is further ensured, so that the welding mechanism 3 remains stable relative to the first pipe 1 and the second pipe 2.

[0053] For example, locking component 604 uses a nut.

[0054] In the embodiment, the workbench 7 is further included, and the fourth driving member 501 and the first arc-shaped fixed block 601 are connected with the first pipeline 1 away from one side of the first pipeline 1 or the second pipeline 2.

[0055] The prefabricated welding process of the first pipeline 1 and the second pipeline 2 is as follows: first, the first pipeline 1 and the second pipeline 2 are fixed by the two fixing mechanisms 6 (the locking member 604 is loosened, the second arc-shaped block is removed from the threaded rod 603, the first pipeline 1 and the second pipeline 2 are placed on the first arc-shaped fixed block 601, the second arc-shaped block is placed on the first pipeline 1 and the second pipeline 2, and finally the locking member 604 is tightened), and the first pipeline 1 and the second pipeline 2 are abutted (that is, the end face of the first pipeline 1 close to the second pipeline 2 is abutted with the end face of the second pipeline 2 close to the first pipeline 1); then, the welding mechanism 3 and the supporting mechanism 4 are driven to move along the Y-axis direction and the Z-axis direction by the driving mechanism 5, so that the welding mechanism 3 is aligned with the center of the first pipeline 1 and the second pipeline 2 (that is, the axis of the welding mechanism 3 is collinear with the center of the first pipeline 1 and the center of the second pipeline 2), and the welding mechanism (that is, the welding gun 305) is aligned with the connection between the first pipeline 1 and the second pipeline 2; then, the third driving member 402 is started to abut the inner wall of the first pipeline 1 and the inner wall of the second pipeline 2, so as to support the first pipeline 1 and the second pipeline 2; finally, the output end of the welding gun 305 is aligned with the connection between the first pipeline 1 and the second pipeline 2 by starting the second driving member 304 first, and then the first driving member 301 is started, and the welding gun 305 is driven to rotate 180° by the first driving member 301, so as to realize the prefabricated welding of the first pipeline 1 and the second pipeline 2.

[0056] In summary, the inner wall of the first pipeline 1 and the inner wall of the second pipeline 2 are supported by the two supporting mechanisms 4, compared with the existing single-side supporting mode, the mode has the advantages of simple structure, convenient operation and improved stability of the welding mechanism 3, so as to improve the welding effect of the pipeline.

[0057] The above description is an explanation of the utility model, not a limitation of the utility model, the scope defined by the utility model is referred to the claims, and any form of modification is allowed within the protection scope of the utility model.

Claims

1. A pipe prefabricated welding backing inner hole welding device for prefabricated welding backing inner hole welding between a first pipe (1) and a second pipe (2), characterized in that, The utility model relates to a welding device for the first pipeline (1) and the second pipeline (2) between prefabricated welding backing hole welding, two support mechanisms (4) are located on both sides of the welding mechanism (3) respectively, and the support mechanism (4) is connected with the welding mechanism (3), and the two support mechanisms (4) are used for supporting the inner wall of the first pipeline (1) and the inner wall of the second pipeline (2) respectively. Further comprising: The driving mechanism (5) is connected with the driving end of the welding mechanism (3), and the driving mechanism (5) is used for driving the welding mechanism (3) to move along the Z-axis direction to align the center of the first pipeline (1) and the center of the second pipeline (2), and the driving mechanism (5) is also used for driving the welding mechanism (3) to move along the Y-axis direction to align the connection of the first pipeline (1) and the second pipeline (2); 2. The pipe prewelded tacked inside hole welding apparatus of claim 1 wherein: The support mechanism (4) on the side close to the driving mechanism (5) is fixedly connected with the welding mechanism (3), and the support mechanism (4) on the side away from the driving mechanism (5) is rotatably connected with the welding mechanism (3). The welding mechanism (3) comprises: The first driving part (301) is connected with the driving end of the driving mechanism (5) through the second fixed block (306), one end of the rotating rod (302) is connected with the driving end of the first driving part (301), the first fixed block (303) is sleeved on the rotating rod (302) and is fixedly connected with the rotating rod (302), the second driving part (304) is connected with the first fixed block (303), the welding gun (305) is connected with the driving end of the second driving part (304), the rotating rod (302) is used for driving the welding gun (305) to rotate along the radial end face of the first pipeline (1) or the second pipeline (2), and the second driving part (304) is used for driving the welding gun (305) to move along the radial direction of the first pipeline (1) or the second pipeline (2); 3. The pipe prewelded tacked inside hole welding apparatus of claim 2 wherein: The support mechanism (4) on the side close to the driving mechanism (5) is fixedly connected with the first driving part (301), and the support mechanism (4) on the side away from the driving mechanism (5) is rotatably connected with the other end of the rotating rod (302). The welding gun (305) is provided with two, the two welding guns (305) are oppositely arranged, and the welding gun (305) corresponds to the second driving part (304) one by one. The support mechanism (4) comprises:

4. The pipe prewelded backing tack weld apparatus of claim 3 wherein: ​ 5. The pipe prewelded backing tacking inside hole welding apparatus of claim 1 wherein: ​ A third fixed block (401), a third driving member (402) installed on the outer circumferential surface of the third fixed block (401), and an arc-shaped support block (403) connected with the driving end of the third driving member (402), wherein the third driving member (402) is used to drive the arc-shaped support block (403) to move along the radial direction of the first pipe (1) or the second pipe (2), so that the side surface of the arc-shaped support block (403) away from the driving end of the third driving member (402) is in close contact with the inner wall of the first pipe (1) or the second pipe (2).

6. The pipe prewelded backing tack weld apparatus of claim 5 wherein: A plurality of arc-shaped support blocks (403) are provided, and the plurality of arc-shaped support blocks (403) are distributed in a ring shape at equal intervals, and the arc-shaped support blocks (403) correspond to the third driving members (402) one by one.

7. The pipe prewelded backing tacking inside hole welding apparatus of claim 3 wherein: The driving mechanism (5) comprises: A fourth driving member (501) and a fifth driving member (502), wherein the driving end of the fourth driving member (501) is connected with the fifth driving member (502) through a fourth fixed block (503), and the driving end of the fifth driving member (502) is connected with the second fixed block (306); The fourth driving member (501) is used to drive the welding mechanism (3) to move along the Z-axis direction, and the fifth driving member (502) is used to drive the welding mechanism (3) to move along the Y-axis direction.

8. The pipe prewelded backing tack weld apparatus of claim 7 wherein: Further comprising: Two fixing mechanisms (6) for fixing the first pipe (1) and the second pipe (2) respectively.

9. The pipe prewelded backing tack weld apparatus of claim 8 wherein: The fixing mechanism (6) comprises: A first arc-shaped fixed block (601), a second arc-shaped fixed block (602), a threaded rod (603), and a locking member (604), wherein the first arc-shaped fixed block (601) is located below the first pipe (1) and the second pipe (2), the second arc-shaped fixed block (602) is located above the first pipe (1) and the second pipe (2), the first arc-shaped fixed block (601) and the second arc-shaped fixed block (602) are in close contact with the outer circumferential surface of the first pipe (1) or the second pipe (2) near the side surface of the first pipe (1) and the second pipe (2), one end of the threaded rod (603) is connected with the first arc-shaped fixed block (601), the other end of the threaded rod (603) penetrates through the second arc-shaped fixed block (602), and the locking member (604) is located on the side of the second arc-shaped fixed block (602) away from the first arc-shaped fixed block (601) and is threadedly connected with the other end of the threaded rod (603); A plurality of threaded rods (603) are provided, and the plurality of threaded rods (603) are respectively located at the two ends of the first arc-shaped fixed block (601), and the locking member (604) corresponds to the threaded rod (603) one by one.

10. The pipe prewelded tacked inside hole welding apparatus of claim 9 wherein: Further comprising: A workbench (7) is connected with the first pipeline (1) on the side away from the fourth driving member (501) and the first arc-shaped fixed block (601).

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