CN114378526A

CN114378526A - Welding process of pipeline

Info

Publication number: CN114378526A
Application number: CN202210193808.0A
Authority: CN
Inventors: 李明泽
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2022-04-22

Abstract

The invention belongs to the technical field of pipeline welding, in particular to a pipeline welding process, which comprises the following steps of; the invention provides a welding process of a pipeline, and the welding process comprises the following steps of S1: pipelines to be welded are distributed and placed from the first through grooves in the placing plates on the two sides; s2: then, the first turntable is rotated, the pair of arc-shaped plates are driven to move oppositely through the rotation of the screw rod, so that the pipelines are fixed, and then the pipelines move towards the annular cylinder to enable the two pipelines to be attached; s3: rotating the second turntable to further adjust the distance of the welding machine, then starting the motor, and driving the motor to rotate through driving the annular plate to further drive the welding machine to comprehensively weld the two attached pipelines; the rotation of solving the pipeline can produce centrifugal force, can influence the inseparable quality of laminating between two pipelines, and then influences welding quality's problem.

Description

Welding process of pipeline

Technical Field

The invention belongs to the technical field of pipeline welding, and particularly relates to a pipeline welding process.

Background

At present, need the pipeline in the urban construction, wherein metal pipeline application scope is wider, and metal pipeline can be used for fluid such as conveying gas, liquid, need weld the different pipeline when daily use for this reason and be used for satisfying the different user demand of user.

In the prior art, when pipelines are welded comprehensively, the pipelines are rotated to facilitate welding, but when longer pipelines are welded, the rotation of the long pipelines is complicated and inconvenient, and the rotation of the pipelines generates centrifugal force, so that the close fitting quality between the two pipelines is influenced, and further the welding quality is influenced.

Disclosure of Invention

In order to make up for the defects of the prior art and solve the problems that when the pipelines are comprehensively welded, the pipelines can be rotated to facilitate welding treatment, but when some longer pipelines are welded, the rotation of the long pipelines is complicated and inconvenient, and the rotation of the pipelines can generate centrifugal force to influence the close quality of the fit between the two pipelines, so that the welding quality is influenced, the invention provides the welding process of the pipelines.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a welding process of a pipeline, which comprises the following steps:

s1: pipelines to be welded are distributed and placed from the first through grooves in the placing plates on the two sides;

s2: then, the first turntable is rotated, the pair of arc-shaped plates are driven to move oppositely through the rotation of the screw rod, so that the pipelines are fixed, and then the pipelines move towards the annular cylinder to enable the two pipelines to be attached;

s3: the second turntable is rotated, the distance of the welding machine is further adjusted, then the motor is started, the motor can rotate through driving the annular plate, and then the welding machine is driven to comprehensively weld the two attached pipelines.

Preferably, a placement plate is included; the side walls of the pair of placing plates are provided with first through grooves; an annular cylinder is fixedly connected between the pair of placing plates; a clamping piece is arranged in the first through groove; the middle end of the annular cylinder is rotatably connected with an annular plate; a welding machine is arranged on the inner wall of the annular plate; in the prior art, when the pipeline is welded completely, the pipeline is rotated to facilitate the welding treatment, but when some longer pipelines are welded, the rotation of the long pipelines is more complicated and inconvenient, and the rotation of the pipelines can generate centrifugal force, which can affect the close fitting quality between the two pipelines and further affect the welding quality, therefore, when the invention works, when the long pipeline needs to be welded, the two pipelines can be distributed, the welding end extends into the annular cylinder through the first through groove, then the long pipeline is fixed by the clamping piece in the first through groove, and then the annular plate is rotated, and then carry out comprehensive processing to the pipeline wall of laminating through the welding machine, through the rotation of welding machine, can effectively avoid appearing centrifugal force to the influence of pipeline laminating, and utilize the fixed of holder, can guarantee the laminating quality of two pipelines.

Preferably, the clamping piece comprises a first cavity and an arc-shaped plate; a first cavity is formed in the placing plate; a lead screw is rotationally connected in the first cavity; a first chute is formed in the side wall of the first cavity, and the first cavity is communicated with the first through groove through the first chute; a moving plate is connected in the first sliding groove in a sliding mode, one end of the moving plate is connected to the screw rod through a screw rod nut pair, and the other end of the moving plate is fixedly connected to the arc-shaped plate; the end part of the screw rod extends out of the top end of the placing plate and is fixedly connected with a first rotating disc; when the welding machine works, when a pipeline needing to be welded is fixed, the first rotating disc is rotated at the moment; first carousel can drive the lead screw and rotate, and the lead screw rotates and can drive a pair of movable plate in opposite directions, and then drives the arc and move in opposite directions, and then carries out the centre gripping to placing the pipeline that leads to the groove at first and fix, stability when guaranteeing two pipeline welding, further guarantee pipeline welding quality.

Preferably, a first groove is formed in the inner wall of the arc-shaped plate; a first rotating shaft is rotatably connected in the first groove; the first rotating shaft is fixedly connected with a roller; the during operation is equipped with first recess in the arc, and is equipped with a set of first axis of rotation in the first recess, is equipped with the gyro wheel on the first axis of rotation, can conveniently carry out horizontal migration to placing the pipeline on the arc, and the convenience is fixed to the laminating of two pipelines.

Preferably, the outer side wall of the roller is provided with an annular groove; a group of clamping blocks is fixedly connected to the bottom of the annular groove; the section of the clamping block is a right-angle trapezoidal block; the top end of the first groove is hinged with a clamping rod; the end part of the clamping rod is contacted with the inclined surface of the right-angle trapezoidal block; the during operation, in order to avoid appearing when the laminating is fixed, the level is not hard up, so be equipped with the ring channel in the gyro wheel, utilize screens pole and screens piece, let the gyro wheel can only the folk prescription to remove, and then can make things convenient for in the pipeline pushes annular section of thick bamboo, and can avoid appearing the outside not hard up condition of level.

Preferably, the inner wall of the annular plate is provided with a second groove; the inner wall of the second groove is connected with a sliding block in a sliding manner; the welding machine is fixedly connected to the bottom end of the sliding block; a threaded rod is connected to the annular plate in a threaded manner, the bottom end of the threaded rod extends into the second groove and is rotatably connected to the top end of the sliding block, and a second rotary table is fixedly connected to the top end of the threaded rod; during operation, through rotating the second carousel, can drive the threaded rod and reciprocate, and then reciprocate on second recess inner wall through promoting the slider, and then can adjust the distance length of welding machine, and then can guarantee that the pipeline can not collide the welding pipe department of welding machine in getting into annular section of thick bamboo, can adjust the welding machine to the distance of welding department according to actual pipeline simultaneously.

Preferably, the outer side wall of the annular plate is fixedly connected with an annular rack; the outer side wall of the annular cylinder is fixedly connected with a motor; a first gear is fixedly connected to an output shaft of the motor; the first gear and the annular rack are meshed with each other; the during operation because the manual rotation annular plate of people can lead to the rotational speed inequality, influences welding quality, for this reason, when needs rotate the annular plate, can start the motor, the motor is through the intermeshing of first gear and annular rack, and then drives the annular plate and rotate, and the even rotation of annular plate can and then guarantee welding quality.

Preferably, a group of annular blocks which are symmetrically distributed relative to the welding machine are fixedly connected to the bottom end of the annular plate; a fixing plate is fixedly connected to the side wall of the annular block; the top end of the fixing plate is fixedly connected with an air bag; a group of arc blocks is fixedly connected to the inner wall of the annular cylinder; the annular block is provided with a first inclined plane; an air outlet cavity is formed in the annular block; the air outlet cavity is communicated with the air bag through a hose; the first inclined plane is provided with an air outlet hole, and the air outlet hole and the first inclined plane are arranged vertically; the air outlet hole is communicated with the air outlet cavity; the during operation, when the annular plate rotated, can drive annular piece and fixed plate and rotate, and then can let gasbag and arc piece extrude each other, both extrude each other and can let the gas of gasbag pass through the hose and get into the venthole chamber, then spout through the venthole, and first inclined plane and venthole mutually perpendicular, and wind-force can blow welding seam department, and then conveniently dispels the heat to it and handle, guarantees the welding seam quality.

Preferably, a group of first through holes are formed in the outer side wall of the annular plate; the first through hole is positioned between the pair of annular blocks; during operation, be equipped with a set of first through-hole on the annular plate lateral wall, and utilize first through-hole can conveniently flow some welding impurity from the annular plate in, also can conveniently weld scattering and disappearing of smog and heat, guarantee the clean and tidy and quick heat dissipation in the annular plate.

Preferably, the outer side wall of the roller is fixedly connected with a layer of non-slip mat; the anti-skid pad is made of rubber; during operation, be equipped with the slipmat on the gyro wheel lateral wall, can avoid pipeline level and endwise slip on the gyro wheel, can guarantee fixed welded stability, and then guarantee the welding effect of two pipelines.

The invention has the following beneficial effects:

1. according to the welding process of the pipeline, the long pipeline is fixed through the clamping piece in the first through groove, then the annular plate is rotated, the attached pipeline wall is comprehensively processed through the welding machine, the influence of centrifugal force on pipeline attachment can be effectively avoided through rotation of the welding machine, and the attachment quality of the two pipelines can be guaranteed through fixation of the clamping piece.

2. According to the welding process of the pipeline, the motor is started, the motor drives the annular plate to rotate through mutual meshing of the first gear and the annular rack, the annular plate rotates uniformly, and the welding quality can be further guaranteed.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a flow chart of a process for welding a pipe;

FIG. 2 is a cross-sectional view of an annular cylinder;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a side view of the placement board;

FIG. 5 is a view from the direction B of FIG. 4;

FIG. 6 is a perspective view of the annular plate;

FIG. 7 is a drawing of the second embodiment;

in the figure: 1. placing the plate; 11. a first through groove; 12. an annular cylinder; 13. an annular plate; 14. welding machine; 2. a first cavity; 21. a first chute; 22. an arc-shaped plate; 23. a lead screw; 24. a first turntable; 25. moving the plate; 3. a first groove; 31. a first rotating shaft; 32. a roller; 33. an annular groove; 34. a bit block; 35. a position clamping rod; 4. a second groove; 41. a slider; 42. a threaded rod; 43. a second turntable; 44. an electric motor; 45. a first gear; 46. an annular rack; 5. a ring block; 51. a fixing plate; 52. an air bag; 53. a first inclined plane; 54. an air outlet cavity; 55. an air outlet; 56. an arc-shaped block; 57. a first through hole; 58. a non-slip mat.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

The first embodiment is as follows:

as shown in fig. 1 to 6, the welding process of the pipe according to the present invention comprises the following steps:

s1: pipelines to be welded are distributed and put into the first through grooves 11 in the placing plates 1 at two sides;

s2: then, the first rotating disc 24 is rotated, the pair of arc-shaped plates 22 are driven to move oppositely through the rotation of the screw 23, so that the pipelines are fixed, and then the pipelines move towards the annular cylinder 12 to be attached;

s3: the second rotating disc 43 is rotated to adjust the distance of the welding machine 14, and then the motor 44 is started, so that the motor 44 can drive the welding machine 14 to perform comprehensive welding on the two attached pipelines by driving the annular plate 13 to rotate.

Comprises a placing plate 1; the side walls of the pair of placing plates 1 are provided with first through grooves 11; an annular cylinder 12 is fixedly connected between the pair of placing plates 1; a clamping piece is arranged in the first through groove 11; the middle end of the annular cylinder 12 is rotatably connected with an annular plate 13; a welding machine 14 is arranged on the inner wall of the annular plate 13; in the prior art, when the pipeline is welded completely, the pipeline is rotated to facilitate the welding treatment, but when some longer pipelines are welded, the rotation of the long pipelines is more complicated and inconvenient, and the rotation of the pipelines can generate centrifugal force, which can affect the close fitting quality between the two pipelines and further affect the welding quality, therefore, when the invention works, when the long pipeline needs to be welded, the two pipelines can be distributed, the welding end extends into the annular cylinder 12 through the first through groove 11, the long pipe is then fixed by the clamps in the first through slots 11, and then by rotating the annular plate 13, and then handle the pipeline wall of laminating comprehensively through welding machine 14, through the rotation of welding machine 14, can effectively avoid appearing centrifugal force to the influence of pipeline laminating, and utilize the fixed of holder, can guarantee the laminating quality of two pipelines.

The clamping piece comprises a first cavity 2 and an arc-shaped plate 22; a first cavity 2 is formed in the placing plate 1; a lead screw 23 is rotationally connected in the first cavity 2; a first chute 21 is formed in the side wall of the first cavity 2, and the first cavity 2 and the first through groove 11 are communicated with each other through the first chute 21; a moving plate 25 is connected in the first sliding chute 21 in a sliding manner, one end of the moving plate 25 is connected to the screw 23 through a screw nut pair, and the other end of the moving plate 25 is fixedly connected to the arc-shaped plate 22; the end part of the screw 23 extends out of the top end of the placing plate 1 and is fixedly connected with a first rotating disc 24; when the welding fixture works, when a pipeline needing to be welded is fixed, the first rotating disc 24 is rotated at the moment; first carousel 24 can drive lead screw 23 and rotate, and lead screw 23 rotates and can drive a pair of movable plate 25 and remove in opposite directions, and then drives arc 22 and remove in opposite directions, and then carries out the centre gripping to the pipeline of placing in first logical groove 11 and fix, stability when guaranteeing two pipeline welding, further guarantee pipeline welding quality.

A first groove 3 is formed in the inner wall of the arc-shaped plate 22; a first rotating shaft 31 is rotatably connected in the first groove 3; a roller 32 is fixedly connected to the first rotating shaft 31; the during operation is equipped with first recess 3 in arc 22, and is equipped with a set of first axis of rotation 31 in the first recess 3, is equipped with gyro wheel 32 on the first axis of rotation 31, can conveniently carry out horizontal migration to placing the pipeline on arc 22, and the convenience is fixed to the laminating of two pipelines.

The outer side wall of the roller 32 is provided with an annular groove 33; a group of clamping blocks 34 is fixedly connected to the bottom of the annular groove 33; the section of the clamping block 34 is a right-angle trapezoidal block; the top end of the first groove 3 is hinged with a clamping rod 35; the end part of the clamping rod 35 is contacted with the inclined surface of the right-angled trapezoidal block; in operation, in order to avoid the horizontal looseness appearing when the laminating is fixed, so be equipped with ring channel 33 in gyro wheel 32, utilize screens pole 35 and screens piece 34, let gyro wheel 32 can only the unilateral remove, and then can make things convenient for the pipeline to push in annular section of thick bamboo 12, and can avoid the outward not hard up condition of level to appear.

A second groove 4 is formed in the inner wall of the annular plate 13; the inner wall of the second groove 4 is connected with a sliding block 41 in a sliding way; the welding machine 14 is fixedly connected to the bottom end of the sliding block 41; a threaded rod 42 is connected to the annular plate 13 through threads, the bottom end of the threaded rod 42 extends into the second groove 4 and is rotatably connected to the top end of the sliding block 41, and a second rotating disc 43 is fixedly connected to the top end of the threaded rod 42; during operation, through rotating second carousel 43, can drive threaded rod 42 and reciprocate, and then reciprocate on second recess 4 inner wall through promoting slider 41, and then can adjust the distance length of welding machine 14, and then can guarantee can not collide the welding pipe department of welding machine 14 in pipeline entering annular section of thick bamboo 12, can adjust the distance of welding machine 14 to the welding department according to actual pipeline simultaneously.

The outer side wall of the annular plate 13 is fixedly connected with an annular rack 46; the outer side wall of the annular cylinder 12 is fixedly connected with a motor 44; a first gear 45 is fixedly connected to an output shaft of the motor 44; the first gear 45 and the annular rack 46 are meshed with each other; during operation, because the manual rotation annular plate 13 of people can lead to the rotational speed uneven, influence welding quality, for this reason, when needs rotate annular plate 13, can start motor 44, motor 44 passes through the intermeshing of first gear 45 and annular rack 46, and then drives annular plate 13 and rotate, and welding quality can then be guaranteed in the even rotation of annular plate 13.

The bottom end of the annular plate 13 is fixedly connected with a group of annular blocks 5 which are symmetrically distributed around a welding machine 14; a fixing plate 51 is fixedly connected to the side wall of the annular block 5; the top end of the fixed plate 51 is fixedly connected with an air bag 52; a group of arc blocks 56 is fixedly connected to the inner wall of the annular cylinder 12; a first inclined plane 53 is formed on the annular block 5; an air outlet cavity 54 is formed in the annular block 5; the air outlet cavity 54 is communicated with the air bag 52 through a hose; the first inclined plane 53 is provided with an air outlet 55, and the air outlet 55 and the first inclined plane 53 are arranged vertically; the air outlet hole 55 and the air outlet cavity 54 are communicated with each other; during operation, when annular plate 13 rotated, can drive annular piece 5 and fixed plate 51 and rotate, and then can let gasbag 52 and arc piece 56 extrude each other, both extrude each other and can let the gas of gasbag 52 pass through the hose and get into air outlet cavity 54, then spout through venthole 55, and first inclined plane 53 and venthole 55 mutually perpendicular, and wind-force can blow welding seam department, and then conveniently dispel the heat to it and handle, guarantee the welding seam quality.

A group of first through holes 57 are formed in the outer side wall of the annular plate 13; the first through hole 57 is located between the pair of ring blocks 5; during operation, be equipped with a set of first through-hole 57 on the annular plate 13 lateral wall, and utilize first through-hole 57 can conveniently flow out some welding impurity from annular plate 13, also can conveniently weld scattering and disappearing of smog and heat, guarantee the clean and tidy and quick heat dissipation in the annular plate 13.

Example two:

as shown in fig. 7, in a first comparative example, as another embodiment of the present invention, a layer of non-slip mat 58 is fixed on the outer side wall of the roller 32; the anti-skid pad 58 is made of rubber; during operation, be equipped with slipmat 58 on gyro wheel 32 lateral wall, can avoid the level and the endwise slip of pipeline on gyro wheel 32, can guarantee fixed welded stability, and then guarantee the welding effect of two pipelines.

The working principle is as follows: when long pipelines need to be welded, the two pipelines can be distributed, welding ends of the two pipelines extend into the annular cylinder 12 through the first through groove 11, then the long pipelines are fixed through the clamping pieces in the first through groove 11, then the annular plate 13 is rotated, and the attached pipeline walls are comprehensively processed through the welding machine 14, so that the influence of centrifugal force on pipeline attachment can be effectively avoided through the rotation of the welding machine 14, and the attachment quality of the two pipelines can be ensured by the fixation of the clamping pieces; when the pipeline to be welded is fixed, the first rotating disc 24 is rotated at the moment; the first rotating disc 24 can drive the screw 23 to rotate, the screw 23 can drive the pair of moving plates 25 to move oppositely, and further drive the arc-shaped plates 22 to move oppositely, so that the pipelines placed in the first through groove 11 are clamped and fixed, the stability of the two pipelines during welding is ensured, and the welding quality of the pipelines is further ensured; a first groove 3 is formed in the arc plate 22, a group of first rotating shafts 31 are arranged in the first groove 3, and rollers 32 are arranged on the first rotating shafts 31, so that the pipeline placed on the arc plate 22 can be conveniently moved horizontally, and the two pipelines can be conveniently attached and fixed; in order to avoid horizontal looseness when the pipe is attached and fixed, an annular groove 33 is formed in the roller 32, and the roller 32 can only move in one direction by using a clamping rod 35 and a clamping block 34, so that the pipe can be conveniently pushed into the annular cylinder 12, and the condition of horizontal outward looseness can be avoided; the threaded rod 42 can be driven to move up and down by rotating the second turntable 43, and then the sliding block 41 is pushed to move up and down on the inner wall of the second groove 4, so that the distance and the length of the welding machine 14 can be adjusted, the pipe can be prevented from colliding with the welding pipe of the welding machine 14 when entering the annular cylinder 12, and meanwhile, the distance from the welding machine 14 to the welding position can be adjusted according to the actual pipe; the rotating speed is uneven due to manual rotation of the annular plate 13, and the welding quality is affected, so that when the annular plate 13 needs to be rotated, the motor 44 can be started, the motor 44 drives the annular plate 13 to rotate through mutual meshing of the first gear 45 and the annular rack 46, and the welding quality can be further ensured due to uniform rotation of the annular plate 13; when the annular plate 13 rotates, the annular block 5 and the fixing plate 51 can be driven to rotate, the air bag 52 and the arc-shaped block 56 can be extruded mutually, the air of the air bag 52 can enter the air outlet cavity 54 through the hose by extruding mutually, then the air is sprayed out through the air outlet hole 55, the first inclined surface 53 and the air outlet hole 55 are perpendicular to each other, the welding seam can be blown by wind power, heat dissipation treatment can be conveniently carried out on the welding seam, and the quality of the welding seam is ensured.

The front, the back, the left, the right, the upper and the lower are all based on figure 1 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and the like.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A welding process for pipelines is characterized by comprising the following steps:

s1: pipelines to be welded are distributed and put into the first through grooves (11) in the placing plates (1) at two sides;

s2: then, the first rotating disc (24) is rotated, the pair of arc-shaped plates (22) are driven to move oppositely through the rotation of the screw rod (23), then the pipelines are fixed, and then the pipelines move towards the annular cylinder (12) to be attached;

s3: the second rotating disc (43) is rotated, the distance of the welding machine (14) is further adjusted, then the motor (44) is started, the motor (44) can rotate through driving the annular plate (13), and then the welding machine (14) is driven to conduct comprehensive welding on the two attached pipelines.

2. A process for welding pipes according to claim 1, characterized by comprising placing a plate (1); the side walls of the pair of placing plates (1) are provided with first through grooves (11); an annular cylinder (12) is fixedly connected between the pair of placing plates (1); a clamping piece is arranged in the first through groove (11); the middle end of the annular cylinder (12) is rotatably connected with an annular plate (13); and a welding machine (14) is arranged on the inner wall of the annular plate (13).

3. A process for welding pipes according to claim 2, characterized in that said clamp comprises a first cavity (2) and an arched plate (22); a first cavity (2) is formed in the placing plate (1); a screw rod (23) is rotationally connected in the first cavity (2); a first chute (21) is formed in the side wall of the first cavity (2), and the first cavity (2) and the first through groove (11) are communicated with each other through the first chute (21); a moving plate (25) is connected in the first sliding groove (21) in a sliding manner, one end of the moving plate (25) is connected to the screw rod (23) through a screw rod and nut pair, and the other end of the moving plate (25) is fixedly connected to the arc-shaped plate (22); the end part of the screw rod (23) extends out of the top end of the placing plate (1) and is fixedly connected with a first rotating disc (24).

4. A process for welding pipes according to claim 3, characterized in that said arc-shaped plate (22) has a first recess (3) made on its inner wall; a first rotating shaft (31) is rotationally connected in the first groove (3); the first rotating shaft (31) is fixedly connected with a roller (32).

5. The welding process of the pipelines according to claim 4, wherein the outer side wall of the roller (32) is provided with an annular groove (33); a group of clamping blocks (34) is fixedly connected to the bottom of the annular groove (33); the section of the clamping block (34) is a right-angle trapezoidal block; the top end of the first groove (3) is hinged with a clamping rod (35); and the end part of the clamping rod (35) is contacted with the inclined surface of the right-angled trapezoidal block.

6. A process for welding pipes as claimed in claim 5, wherein said annular plate (13) is provided, on its inner wall, with a second groove (4); the inner wall of the second groove (4) is connected with a sliding block (41) in a sliding manner; the welding machine (14) is fixedly connected to the bottom end of the sliding block (41); threaded connection has threaded rod (42) on annular plate (13), and threaded rod (42) bottom stretches into in second recess (4) and swivelling joint on slider (41) top, and threaded rod (42) top rigid coupling has second carousel (43).

7. The welding process of a pipeline according to claim 6, characterized in that an annular rack (46) is fixedly connected to the outer side wall of the annular plate (13); the outer side wall of the annular cylinder (12) is fixedly connected with a motor (44); a first gear (45) is fixedly connected to an output shaft of the motor (44); the first gear (45) and the annular rack (46) are meshed with each other.

8. A process for welding pipes as claimed in claim 7, characterized in that a set of annular blocks (5) symmetrically distributed with respect to the welding machine (14) is fixed to the bottom end of said annular plate (13); a fixing plate (51) is fixedly connected to the side wall of the annular block (5); the top end of the fixed plate (51) is fixedly connected with an air bag (52); a group of arc blocks (56) is fixedly connected to the inner wall of the annular cylinder (12); a first inclined plane (53) is formed on the annular block (5); an air outlet cavity (54) is formed in the annular block (5); the air outlet cavity (54) is communicated with the air bag (52) through a hose; the first inclined plane (53) is provided with an air outlet hole (55), and the air outlet hole (55) and the first inclined plane (53) are arranged vertically; the air outlet hole (55) is communicated with the air outlet cavity (54).

9. The welding process of a pipe according to claim 8, characterized in that a set of first through holes (57) is provided on the outer side wall of said annular plate (13); the first through hole (57) is located between a pair of ring blocks (5).

10. The welding process of a pipeline according to claim 9, wherein a layer of non-slip mat (58) is fixedly connected to the outer side wall of the roller (32); the non-slip mat (58) is made of rubber.