Pipeline all-position multi-welding-torch polishing-free joint welding process and welding device

Abstract

The invention provides a pipeline all-position multi-welding-torch polishing-free joint welding process and a welding device, and belongs to the technical field of pipeline welding. The first welding trolley and the second welding trolley move clockwise or anticlockwise in the circumferential direction of the weld joint. And an arc starting section with a fixed length is arranged at the topmost end of the welding seam. And a welding torch on the first welding trolley starts welding from one end of the arc starting section and rotates clockwise to complete welding of the whole arc starting section. And after the first welding trolley completes welding of the arc starting section, the second welding trolley starts welding from the other end of the arc starting section, by adopting the design of the arc starting section and adjusting the welding technology on the first welding trolley and the second welding trolley, protruding of the arc starting section and the arc starting point can be avoided, polishing of operators in the welding process is reduced, and the welding efficiency is improved. And the welding efficiency can be improved while the welding quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline welding, and in particular relates to a pipeline all-position multi-torch grinding-free joint welding process and a welding device. Background Art

[0002] In the process of automatic pipeline welding, a welding machine is required to perform multi-layer welding. In order to improve the welding efficiency of the pipeline, multiple welding torches are usually used for synchronous welding. During the welding process of the pipeline, the joint of the arc starting point often protrudes from the welding part. If it is not processed during the subsequent welding, defects will occur. The current processing method usually uses manual grinding to grind off the arc starting point to eliminate potential defects. On the one hand, there are large differences in grinding quality, which affects the stability of welding quality. Therefore, in the process of automatic welding, when the same section needs to be repeatedly filled and welded, in order to avoid the protruding parts affecting the welding quality, the protruding parts on the arc starting section of the previous welding need to be polished in advance before the subsequent filling welding can be performed, and the continuous welding operation cannot be achieved. Therefore, when welding the pipeline, the arc starting section needs to be repeatedly manually polished during the pipeline welding process, which affects the overall welding efficiency of the pipeline. Summary of the invention

[0003] The embodiment of the present invention provides a pipeline all-position multi-torch grinding-free joint welding process, which aims to solve the problem in the prior art that the arc starting point of the pipeline needs to be ground during the welding process, which affects the welding quality and welding efficiency.

[0004] To achieve the above object, the technical solution adopted by the present invention is to provide a pipeline all-position multi-torch grinding-free joint welding process, including:

[0005] S1. Define two pipes to be welded as a first pipe and a second pipe, a first welding carriage for welding along the circumference of the first pipe is installed on the first pipe, and a second welding carriage for welding along the circumference of the second pipe is installed on the second pipe;

[0006] S2. Setting a certain length of the top of the weld between the first pipeline and the second pipeline as the arc starting section, the highest point of the weld is located in the middle of the arc starting section;

[0007] S3. The first welding carriage starts welding from one end of the arc starting segment and moves clockwise to weld. After the arc starting segment is welded, the second welding carriage starts welding from the other end of the arc starting segment and moves counterclockwise to weld. The welding thickness of the arc starting segment is less than the welding thickness of the remaining parts.

[0008] S4. When the first welding carriage and the second welding carriage are welded to the lowest point of the weld, stop welding and move to the top of the weld to repeat the welding step of S3 until the welding is completed.

[0009] In a possible implementation, during arc starting section welding, the moving speed of the first welding carriage and the second welding carriage on the first pipe and the second pipe is greater than the moving speed of other welding parts.

[0010] In combination with the first aspect, the present invention also provides a welding device, comprising at least two of the first welding carriages installed on the first pipe, and at least two of the second welding carriages installed on the second pipe, the two first welding carriages sequentially weld the weld along a clockwise direction, and the two second welding carriages sequentially weld the weld along a counterclockwise direction.

[0011] In a possible implementation, at least two welding torches for welding are installed on the first welding carriage and the second welding carriage, and both welding torches adopt a consumable electrode welding process.

[0012] In a possible implementation, the first welding carriage and the second welding carriage have the same structure, and the first welding carriage includes:

[0013] Vehicle body;

[0014] A swing arm has one end mounted on the vehicle body and a welding torch mounted on the other end. When the vehicle body moves to the top of the weld, the swing arm has the freedom to adjust along the pitch angle on the vehicle body.

[0015] In a possible implementation, a storage arm is hingedly provided at one end of the swing arm away from the vehicle body, a hinge axis of the storage arm on the swing arm is arranged parallel to a hinge axis of the swing arm on the vehicle body, and the welding torch is mounted on the storage arm.

[0016] In a possible implementation, the vehicle body is further provided with a pushing component for driving the swing arm to reciprocate along the axis direction of the first pipe or the second pipe.

[0017] In a possible implementation, the pushing component includes:

[0018] A mounting seat, slidably arranged on the vehicle body, and the swing arm is hingedly arranged on the mounting seat;

[0019] A threaded sleeve, fixedly mounted on the mounting seat;

[0020] A lead screw, threadedly connected to the threaded sleeve and rotatably arranged on the vehicle body;

[0021] A driving member is mounted on the vehicle body, and a driving end of the driving member is drivingly connected to the lead screw for driving the lead screw to rotate.

[0022] In a possible implementation, the number of the first welding carriages is two, and when the welding torch on one of the first welding carriages is located at the welding starting point, the welding torch on the other first welding carriage is located at the welding end point.

[0023] In a possible implementation, the second welding trolley and the first welding trolley are respectively installed alternately on the first pipe and the second pipe along the circumference of the weld, and the distance between the welding torch on the first welding trolley and the welding torch on the second welding trolley is not less than the length of the arc starting segment.

[0024] The scheme shown in the embodiment of the present application is compared with the prior art. When the first pipeline and the second pipeline are welded, the first welding trolley and the second welding trolley are respectively installed on the first pipeline and the second pipeline. The first welding trolley and the second welding trolley move clockwise or counterclockwise along the circumference of the weld respectively. A fixed length of arc starting segment is provided at the top of the weld. When the first pipeline and the second pipeline are welded, the welding torch on the first welding trolley starts welding from one end of the arc starting segment first, and rotates clockwise to complete the welding of the entire arc starting segment. Then, the subsequent welding is performed according to the normal welding process until the welding reaches the lowest point of the weld. After the first welding trolley completes the welding of the arc starting segment, the second welding trolley starts welding from the other end of the arc starting segment, and rotates counterclockwise to complete the welding of the entire arc starting segment, and then the subsequent welding is performed according to the normal welding process until the welding reaches the lowest point of the weld, and the reciprocating operation of the first welding trolley and the second welding trolley is circulated to finally complete the overall welding of the pipeline. The present application, by adopting the design of the arc starting section and adjusting the welding process on the first welding carriage and the second welding carriage, can avoid the protrusion of the arc starting section and the arc starting point, reduce the grinding of the operator during the welding process, improve the welding quality and improve the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the installation structure of the first welding carriage and the second welding carriage provided in an embodiment of the present invention Figure 1 ;

[0026] Figure 2 Schematic diagram of the installation structure of the first welding carriage and the second welding carriage provided in an embodiment of the present invention Figure 2 ;

[0027] Figure 3 A schematic structural diagram of a first welding carriage provided in an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of a welding process provided by an embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 1. First pipeline; 2. Second pipeline; 3. First welding carriage; 31. Carriage; 32. Swing arm; 33. Storage arm; 4. Second welding carriage; 5. Welding seam; 51. Arc starting section; 6. Pushing assembly; 61. Mounting seat; 62. Threaded sleeve; 63. Lead screw; 64. Driving member. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] Please also read Figures 1 to 4 The pipeline full-position multi-torch grinding-free joint welding process provided by the present invention is now described. The pipeline full-position multi-torch grinding-free joint welding process comprises the following steps:

[0033] S1. Define two pipes to be welded as a first pipe 1 and a second pipe 2, a first welding carriage 3 for welding along the circumference of the first pipe 1 is installed on the first pipe 1, and a second welding carriage 4 for welding along the circumference of the second pipe 2 is installed on the second pipe 2;

[0034] S2. A certain length of the top of the weld 5 of the first pipe 1 and the second pipe 2 is set as the arc starting section 51, and the highest point of the weld 5 is located in the middle of the arc starting section 51;

[0035] S3. The first welding carriage 3 starts welding from one end of the arc starting segment 51 and moves clockwise to weld. After the arc starting segment 51 is welded, the second welding carriage 4 starts welding from the other end of the arc starting segment 51 and moves counterclockwise to weld. The welding thickness of the arc starting segment 51 is less than the welding thickness of the remaining parts.

[0036] S4. When the first welding carriage 3 and the second welding carriage 4 are welded to the lowest point of the weld 5, stop welding and move to the top of the weld 5 to repeat the welding steps of S3 until the welding is completed.

[0037] Compared with the prior art, the pipeline full-position multi-torch grinding-free joint welding process provided in this embodiment is that when the first pipeline 1 and the second pipeline 2 are welded, the first welding carriage 3 and the second welding carriage 4 are respectively installed on the first pipeline 1 and the second pipeline 2. The first welding carriage 3 and the second welding carriage 4 move clockwise or counterclockwise along the circumference of the weld 5 respectively. And a fixed length of arc starting section 51 is set at the top of the weld 5. When the first pipeline 1 and the second pipeline 2 are welded, the welding torch on the first welding carriage 3 starts welding from one end of the arc starting section 51, and rotates clockwise to complete the welding of the entire arc starting section 51. Then, the subsequent welding is performed according to the normal welding process until the lowest point of the weld 5 is welded. After the first welding carriage 3 completes the welding of the arc-starting section 51, the second welding carriage 4 starts welding from the other end of the arc-starting section 51, and rotates counterclockwise to complete the welding of the entire arc-starting section 51, and then performs subsequent welding according to the normal welding process until the welding reaches the lowest point of the weld 5, and cycles the reciprocating operation of the first welding carriage 3 and the second welding carriage 4, and finally completes the overall welding of the pipeline. In this application, by adopting the design of the arc-starting section 51 and adjusting the welding process on the first welding carriage 3 and the second welding carriage 4, it is possible to avoid the arc-starting section 51 and the arc-starting point from protruding, reduce the grinding of operators during the welding process, improve the welding quality, and improve the welding efficiency.

[0038] Specifically, in this embodiment, during the welding process of the weld 5, the welding torch on the first welding carriage 3 performs initial welding on the arc starting segment 51. The second welding carriage 4 is located on the clockwise side of the first welding carriage 3. Before the first welding carriage 3 passes the second welding carriage 4, the welding torch on the second welding carriage 4 is in a retracted state to avoid interference with the welding torch on the first welding carriage 3. After the first welding carriage 3 passes the second welding carriage 4, the welding torch on the second welding carriage 4 flips to the working position and starts welding. The first welding carriage 3 and the second welding carriage 4 weld the half sections of the weld 5 respectively, and the overall welding of the weld 5 is completed.

[0039] In some embodiments, the arc starting section 51 may be welded using the following process, see Figure 1 , Figure 4 When welding the arc starting section 51, the moving speed of the first welding carriage 3 and the second welding carriage 4 on the first pipe 1 and the second pipe 2 is greater than the moving speed of the other welding parts. The arc starting section 51 welding adopts the same consumable electrode welding process as the welding of other parts, but in the arc starting section 51 welding, the moving speed of the first welding carriage 3 and the second welding carriage 4 is increased, and the wire feeding speed and welding current are increased, so that the welding thickness at the arc starting section 51 can be reduced. It is ensured that the welding thickness of the arc starting section 51 is less than the welding thickness of the normal welding section.

[0040] Preferably, the welding thickness of the arc starting section 51 is 1 / 2 of the normal welding thickness by controlling the moving speed of the first welding carriage 3 and the second welding carriage 4 and increasing the wire feeding speed and welding current. In the present application, during welding, the arc starting section 51 can be repeatedly welded by the welding torches on the first welding carriage 3 and the second welding carriage 4, which can avoid the arc starting position from protruding. At the same time, during a single welding cycle, the arc starting section 51 is double welded by the first welding carriage 3 and the second welding carriage 4, which can make the thickness of the arc starting section 51 the same as that of other parts. The filling of the arc starting section 51 in the later stage is avoided, so that the arc starting section 51 can be welded synchronously with other parts.

[0041] Specifically, in this embodiment, the first welding carriage 3 and the second welding carriage 4 move on the first pipeline 1 and the second pipeline 2 along a top-down welding manner.

[0042] Please also read Figure 1 , Figure 2 , the welding device provided by the present invention is now described. The welding device includes at least two first welding carriages 3 installed on the first pipeline 1, and at least two second welding carriages 4 installed on the second pipeline 2. The two first welding carriages 3 weld the weld 5 in turn along the clockwise direction, and the two second welding carriages 4 weld the weld 5 in turn along the counterclockwise direction. The two first welding carriages weld the weld 5 in turn along the clockwise direction, and the welding torches on the multiple first welding carriages 3 all start welding from the starting point of the arc starting section 51, thereby improving the welding efficiency. The welding torches on the multiple second welding carriages 4 all start welding from the starting point at the other end of the arc starting section 51. The welding torches on the arc starting section 51 and the first welding carriage 3 are alternately welded to improve the welding efficiency of the pipeline.

[0043] Specifically, in this embodiment, the number of first welding carriages 3 is two, and the two first welding carriages 3 are arranged adjacent to each other. When the front first welding carriage 3 moves clockwise for welding, the rear first welding carriage 3 moves clockwise for welding together with the front first welding carriage 3; when the rear first welding carriage 3 welds to the lowest point of the weld 5, the two first welding carriages 3 stop welding and return to the top of the weld 5 in a clockwise or counterclockwise direction, and repeat the welding of step S3. The number of second welding carriages 4 is two, and the two second welding carriages 4 are arranged adjacent to each other. When the front second welding carriage 4 moves counterclockwise for welding, the rear second welding carriage 4 moves counterclockwise for welding together with the front second welding carriage 4; when the rear second welding carriage 4 welds to the lowest point of the weld 5, the two second welding carriages 4 stop welding and return to the top of the weld 5 in a clockwise or counterclockwise direction. Repeat the welding of step S3.

[0044] Optionally, in this embodiment, the number of the first welding carriages 3 is two, and the two first welding carriages 3 are arranged at intervals along the circumference of the weld 5, and when the front first welding carriage 3 moves to the point where the welding torch is located at the bottom of the weld 5, the welding torch on the rear first welding carriage 3 is located at the top of the weld 5, and the two first welding carriages 3 always move in a clockwise direction. The two first welding carriages 3 can be welded alternately. The number of the second welding carriages 4 is two, and the two second welding carriages 4 are arranged at intervals along the circumference of the weld 5, and when the front second welding carriage 4 moves to the point where the welding torch is located at the bottom of the weld 5, the welding torch on the rear second welding carriage 4 is located at the top of the weld 5, and the two second welding carriages 4 always move counterclockwise, so that the two second welding carriages 4 are welded alternately.

[0045] In some embodiments, the first welding carriage 3 and the second welding carriage 4 can be used as follows: Figure 1 , Figure 2 and Figure 3 See also Figure 1 , Figure 2 and Figure 3 At least two welding torches are installed on the first welding carriage 3 and the second welding carriage 4, and both of the two welding torches adopt the consumable electrode welding process. Two welding torches are installed on the first welding carriage 3 and the second welding carriage 4, and the two welding torches are arranged at intervals along the length direction of the weld 5. When the first welding carriage 3 moves in a single circle, two passes of welding can be completed by the two welding torches on the first welding carriage 3. The structure of the second welding carriage 4 is the same as that on the first welding carriage 3, and the arrangement of the two welding torches can effectively improve the welding efficiency of the pipeline.

[0046] Preferably, in this embodiment, the two welding torches on the first welding carriage 3 use the same consumable electrode welding process, and combined with the welding method of the arc starting segment 51, the same welding method can be used to reduce the welding thickness of the arc starting segment 51 by changing the wire feeding speed and welding current during the welding process, thereby ensuring that the two welding torches on the first welding carriage 3 can complete the overall welding, thereby improving the overall welding efficiency of the weld 5.

[0047] Preferably, in this embodiment, argon gas plus carbon dioxide and nitrogen are used in the welding process of the weld 5, which can reduce the oxygen generated by the decomposition of carbon dioxide at high temperature, causing the metal in the molten pool to undergo oxidation reaction, and reduce the formation of oxide impurities in the cold wind.

[0048] In some embodiments, the first welding carriage 3 may be used as follows: Figure 3 See the structure shown. Figure 3The first welding carriage 3 and the second welding carriage 4 adopt the same structure. The first welding carriage 3 includes: a carriage body 31 and a swing arm 32. One end of the swing arm 32 is mounted on the carriage body 31, and the other end is mounted with a welding torch. When the carriage body 31 moves to the top of the weld 5, the swing arm 32 has the freedom to adjust along the pitch angle on the carriage body 31. Guide rails for guiding the movement of the first welding carriage 3 and the second welding carriage 4 are installed on the first pipeline 1 and the second pipeline 2. The carriage body 31 on the first welding carriage 3 is movably set on the guide rail, and the swing arm 32 is swingably set on the carriage body 31, and the welding torch is mounted on the swing arm 32. When the first welding carriage 3 and the second welding carriage 4 move relatively to meet, the swing arm 32 on the first welding carriage 3 or the second welding carriage 4 can drive the welding torch to flip upward to avoid the welding in progress, so as to avoid interference between the first welding carriage 3 or the second welding carriage 4 when meeting.

[0049] Specifically, in the present embodiment, one end of the swing arm 32 is hingedly mounted on the vehicle body 31, and a motor for driving the swing arm 32 to swing is also mounted on the vehicle body 31. The motor can drive the swing arm 32 to swing to realize switching between the working state and the storage state.

[0050] In some embodiments, the swing arm 32 may be configured as follows: Figure 3 See the structure shown. Figure 3 The end of the swing arm 32 away from the vehicle body 31 is also hingedly provided with a storage arm 33, the hinge axis of the storage arm 33 on the swing arm 32 is arranged parallel to the hinge axis of the swing arm 32 on the vehicle body 31, and the welding torch is installed on the storage arm 33. The storage arm 33 is also hingedly provided at the end of the swing arm 32 away from the vehicle body 31, and the welding torch is installed on the storage arm 33, which is convenient for further storing the welding torch on the vehicle body 31 to effectively avoid it. At the same time, the inclination angle of the welding torch during the welding process can be adjusted by the storage arm 33 to ensure effective welding quality, and the positions of the swing arm 32 and the storage arm 33 can be adjusted according to the distance between the vehicle body 31 and the weld 5, so that the welding torch and the weld 5 maintain a stable welding angle.

[0051] In some embodiments, the vehicle body 31 may be formed as follows: Figure 3 See the structure shown. Figure 3 The vehicle body 31 is also provided with a pushing assembly 6 for driving the swing arm 32 to reciprocate along the axis direction of the first pipe 1 or the second pipe 2. When the vehicle body 31 is mounted on the first pipe 1 or the second pipe 2, the mounting end of the swing arm 32 on the vehicle body 31 can slide along the axis direction of the first pipe 1 or the second pipe 2. When the swing arm 32 slides back and forth, it can drive the welding torch to reciprocate to complete the welding of the weld 5.

[0052] In some embodiments, the pushing component 6 can be used as follows: Figure 3 See the structure shown. Figure 3 The pushing assembly 6 includes a mounting seat 61, a threaded sleeve 62, a lead screw 63 and a driving member 64. The mounting seat 61 is slidably arranged on the vehicle body 31, and the swing arm 32 is hingedly arranged on the mounting seat 61; the threaded sleeve 62 is fixedly installed on the mounting seat 61; the lead screw 63 is threadedly connected with the threaded sleeve 62 and is rotatably arranged on the vehicle body 31; the driving member 64 is installed on the vehicle body 31, and the driving end of the driving member 64 is transmission-connected with the lead screw 63 to drive the lead screw 63 to rotate. The driving member 64 is a motor, and the driving end of the driving member 64 is transmission-connected with the lead screw 63. When the lead screw 63 rotates, the lead screw 63 can drive the threaded sleeve 62 to move, thereby driving the mounting seat 61 to reciprocate.

[0053] Preferably, in this embodiment, after the vehicle body 31 is mounted on the first pipeline 1 or the second pipeline 2 , the welding torch on the mounting seat 61 can be adjusted to move to the welding seam 5 by moving the mounting seat 61 .

[0054] In some embodiments, the first welding carriage 3 and the second welding carriage 4 can be used as follows: Figure 2 See the structure shown. Figure 2 , the number of the first welding carriages 3 is two, and when the welding torch on one of the first welding carriages 3 is located at the welding starting point, the welding torch on the other first welding carriage 3 is located at the welding end point. The number of the first welding carriages 3 is two, and the two first welding carriages 3 are both arranged on the first pipeline 1 in a clockwise rotation. When the welding torch on one of the first welding carriages 3 is located at the highest point of the weld 5, the welding torch on the other first welding carriage 3 is located at the lowest point of the weld 5. After the welding torch on one of the first welding carriages 3 completes welding, the welding on the other first welding carriage 3 has already started from the top of the weld 5, so that the two first welding carriages 3 can be connected in sequence during the welding process, thereby improving the welding efficiency.

[0055] Specifically, in this embodiment, the number of the second welding carriages 4 is two, and the welding method of the two second welding carriages 4 is the same as the welding method of the first welding carriage 3 .

[0056] Preferably, in this embodiment, the highest point of the weld 5 is located in the middle of the arc starting section 51. When the welding torch on one of the first welding carriages 3 is located at the lowest point of the weld 5, the welding on the other first welding carriage 3 has already started the arc starting section 51 and has been welded to the middle of the arc starting section 51 at the highest point of the weld 5. The arc starting sections 51 of the welding areas of the first welding carriage 3 and the second welding carriage 4 are overlapping parts.

[0057] In some embodiments, the first welding carriage 3 and the second welding carriage 4 can be used as follows: Figure 2 See the structure shown. Figure 2 , the second welding carriage 4 and the first welding carriage 3 are respectively installed on the first pipeline 1 and the second pipeline 2 in an interlaced manner along the circumference of the weld 5, and the distance between the welding torch on the first welding carriage 3 and the welding torch on the second welding carriage 4 is not less than the length of the arc starting section 51. During the initial welding, the first welding carriage 3 and the second welding carriage 4 are interlaced with each other. And the second welding carriage 4 is located on the clockwise side of the first welding carriage 3 along the circumference of the weld 5. The first welding carriage 3 starts welding first, and the welding gun on the second welding carriage 4 is in an avoidance storage state. After the welding torch on the first welding carriage 3 completes the welding of the arc starting section 51, the welding torch on the second welding carriage 4 swings to the working state, and starts welding from the other end point of the arc starting section 51. The cross welding of the first welding carriage 3 and the second welding carriage 4 effectively improves the welding efficiency of the pipeline.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pipeline all-position multi-torch grinding-free joint welding process, characterized in that: include: S1. Two pipes to be welded are defined as a first pipe (1) and a second pipe (2), a first welding carriage (3) for welding along the circumference of the first pipe (1) is installed on the first pipe (1), and a second welding carriage (4) for welding along the circumference of the second pipe (2) is installed on the second pipe (2); S2. A certain length of the top of the weld (5) between the first pipe (1) and the second pipe (2) is set as the arc starting section (51), and the highest point of the weld (5) is located in the middle of the arc starting section (51); S3. The first welding carriage (3) starts welding from one end of the arc-starting segment (51) and moves in a clockwise direction to weld. After the arc-starting segment (51) is welded, the second welding carriage (4) starts welding from the other end of the arc-starting segment (51) and moves in a counterclockwise direction to weld. The welding thickness of the arc-starting segment (51) is less than the welding thickness of the remaining parts. S4. When the first welding trolley (3) and the second welding trolley (4) are welded to the lowest point of the weld (5), stop welding and move to the top of the weld (5) to repeat the welding steps of S3 until the welding is completed.

2. The pipeline all-position multi-torch grinding-free joint welding process according to claim 1 is characterized in that: When welding the arc starting section (51), the moving speed of the first welding carriage (3) and the second welding carriage (4) on the first pipe (1) and the second pipe (2) is greater than the moving speed of the remaining welding parts.

3. A welding device, comprising the pipeline all-position multi-torch grinding-free joint welding process according to claim 1 or 2, characterized in that: It also comprises at least two of the first welding carriages (3) mounted on the first pipeline (1), and at least two of the second welding carriages (4) mounted on the second pipeline (2), wherein the two first welding carriages (3) sequentially weld the weld seam (5) along a clockwise direction, and the two second welding carriages (4) sequentially weld the weld seam (5) along a counterclockwise direction.

4. The welding device according to claim 3, characterized in that At least two welding torches for welding are installed on the first welding carriage (3) and the second welding carriage (4), and both welding torches adopt a consumable electrode welding process.

5. The welding device according to claim 3, characterized in that: The first welding carriage (3) and the second welding carriage (4) have the same structure, and the first welding carriage (3) comprises: Vehicle body (31); A swing arm (32) is mounted on the vehicle body (31) at one end and a welding torch is mounted on the other end. When the vehicle body (31) moves to the top of the weld (5), the swing arm (32) has the freedom to adjust along the pitch angle on the vehicle body (31).

6. The welding device according to claim 5, characterized in that A storage arm (33) is hingedly provided at one end of the swing arm (32) away from the vehicle body (31); a hinge axis of the storage arm (33) on the swing arm (32) is arranged parallel to a hinge axis of the swing arm (32) on the vehicle body (31); and the welding torch is mounted on the storage arm (33).

7. The welding device according to claim 5, characterized in that: The vehicle body (31) is also provided with a pushing component (6) for driving the swing arm (32) to move back and forth along the axis direction of the first pipeline (1) or the second pipeline (2).

8. The welding device according to claim 7, characterized in that The pushing component (6) comprises: A mounting seat (61) is slidably arranged on the vehicle body (31), and the swing arm (32) is hingedly arranged on the mounting seat (61); A threaded sleeve (62) fixedly mounted on the mounting seat (61); A lead screw (63) is threadedly connected to the threaded sleeve (62) and is rotatably disposed on the vehicle body (31); A driving member (64) is mounted on the vehicle body (31), and a driving end of the driving member (64) is drivingly connected to the lead screw (63) for driving the lead screw (63) to rotate.

9. The welding device according to claim 3, characterized in that: The number of the first welding carriages (3) is two, and when the welding torch on one of the first welding carriages (3) is located at the welding starting point, the welding torch on the other of the first welding carriages (3) is located at the welding end point.

10. The welding device according to claim 9, characterized in that The second welding carriage (4) and the first welding carriage (3) are respectively installed alternately on the first pipeline (1) and the second pipeline (2) along the circumference of the welding seam (5), and the distance between the welding torch on the first welding carriage (3) and the welding torch on the second welding carriage (4) is not less than the length of the arc starting section (51).

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