CN110539058A - All-position automatic welding technology for automotive liquefied natural gas cylinder pipeline joint - Google Patents
All-position automatic welding technology for automotive liquefied natural gas cylinder pipeline joint Download PDFInfo
- Publication number
- CN110539058A CN110539058A CN201810528676.6A CN201810528676A CN110539058A CN 110539058 A CN110539058 A CN 110539058A CN 201810528676 A CN201810528676 A CN 201810528676A CN 110539058 A CN110539058 A CN 110539058A
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- CN
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- Prior art keywords
- pipeline
- welding
- joint
- tungsten electrode
- clamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 238000003466 welding Methods 0.000 title claims abstract description 162
- 238000005516 engineering process Methods 0.000 title claims abstract description 32
- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 21
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 63
- 239000010937 tungsten Substances 0.000 claims abstract description 63
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 4
- 230000004927 fusion Effects 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052786 argon Inorganic materials 0.000 abstract description 6
- 238000010891 electric arc Methods 0.000 abstract description 4
- 210000001503 joint Anatomy 0.000 description 6
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
- B23K9/0286—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections with an electrode moving around the fixed tube during the welding operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
Abstract
The full-position automatic welding technology for the pipeline joint of the vehicle liquefied natural gas cylinder is characterized in that the joint is assembled in a clamp a, a pipeline is assembled in a clamp b, a tungsten electrode is installed on a gear, the tungsten electrode of a butt welding seam of the pipeline and the pipeline is centered at the center of the welding seam, and the tungsten electrode of an inserting welding seam of the pipeline and the joint is centered at the end face of the joint; adjusting the height of the tungsten electrode to be proper; setting a rotation angle of a tungsten electrode on a welding power supply according to the wall thicknesses of a pipeline and a joint, wherein the rotation angle is between 375-385 degrees, setting welding parameters in four intervals respectively, introducing back protective gas from the joint or the end face of the pipeline, starting the welding power supply, stopping the tungsten electrode after rotating a preset angle along a welding object, extinguishing an electric arc, completing the welding process, and detaching the joint or the pipeline from a clamp. The invention does not need manual argon tungsten-arc welding process with great operation difficulty, can realize full-position automatic welding technology by fixing pipelines and joints and filling welding wires, has small input of pulse welding heat, high welding seam quality and consistency and low requirement on the skill of workers.
Description
Technical Field
The invention relates to the field of liquefied natural gas cylinders for vehicles, in particular to an all-position automatic welding technology for a pipeline joint of a liquefied natural gas cylinder for a vehicle.
Background
The butt welding seams or fillet welding seams formed by the pipeline and the joint inside the vehicle liquefied natural gas cylinder body and the pipeline and the joint outside the assembly are all welded by manual argon tungsten-arc welding, argon is introduced to the back of the welding seams for protection in order to ensure the welding quality when the austenitic stainless steel is welded by the manual argon tungsten-arc welding, and the pipeline joint is required to be continuously rotated in the welding process in order to enable the welding position to be as flat as possible; the welding operation difficulty of the butt joint of the pipeline and the pipeline needing wire filling is high; the wall thickness difference of the pipeline and the fillet weld of the joint is large, and the thin-walled pipe is easy to be welded through due to overheating during welding; the appearance of the welding seam is poor in forming, and the welding seam needs to be processed after welding. Therefore, the welding efficiency is low, the welding quality is difficult to ensure, and the requirement on the skill of a welder is high.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an all-position automatic welding technology for a vehicle liquefied natural gas cylinder pipeline joint.
The technical scheme adopted by the invention for solving the technical problems is as follows: the joint of the liquefied natural gas cylinder pipeline for the vehicle is welded by an all-position automatic welding device by using an all-position automatic welding technology, wherein the welded objects are the joint and the pipeline; the method comprises the following steps:
Assembling a joint or a pipeline in a clamp a, assembling a pipeline in a clamp b, installing a tungsten electrode on a gear, centering a butt welding seam tungsten electrode of the pipeline and the pipeline at the center of a welding seam, and centering a splicing seam tungsten electrode of the pipeline and the joint at the end face of the joint;
Step two, adjusting the height of the tungsten electrode to be proper;
And thirdly, setting a rotation angle of the tungsten electrode on the welding power supply according to the wall thicknesses of the pipeline and the joint, wherein the rotation angle is between 375 and 385 degrees, setting welding parameters in four intervals respectively, introducing protective gas from the end face of the joint or the pipeline, starting the welding power supply, stopping the tungsten electrode after the tungsten electrode rotates for a preset angle along a welding object, extinguishing the electric arc, finishing the welding process, and detaching the joint or the pipeline from the clamp.
The invention also has the following additional technical features:
Preferably: the all-position automatic welding technology can be applied to the fillet weld of the joint of the pipeline inside the gas cylinder body, and can also be applied to the butt weld of the pipeline and the joint fillet weld of the pipeline and the joint of the pipeline of the external assembly pipeline of the gas cylinder.
Preferably: when the pipeline is a bent pipe, manufacturing an inner hole clamp matched with the curved surface of the pipeline; the curved surface of the inner hole clamp is matched with the integral curved surfaces of the joint and the pipeline.
Preferably: the height of the tungsten electrode is adjusted according to the diameter of a welding object, and the distance between the tungsten electrode and the surface of a welding line is 2 mm.
preferably: the pipeline and pipeline butt weld tungsten electrode is centered at the center of the weld, and the pipeline and joint plug-in weld tungsten electrode is centered at the end face of the joint.
Preferably: the welding object is fixed, the tungsten electrode rotates to a preset angle, welding wires are not filled, and the arc closing position is overlapped with the arc starting position by more than 5 mm.
preferably: the welding seam and the welding object are in smooth transition and orderly fusion.
Preferably: the fillet weld joint welding technology in the all-position automatic welding technology can be applied to the weld joints of other pipelines and joints in an inserting manner.
Preferably: the material of the pipeline and the joint in the all-position automatic welding technology is austenitic stainless steel.
Preferably: the all-position automatic welding device comprises a support, a gear, a tungsten electrode, a clamp a, a clamp b, a connecting wire and a welding power supply. A clamp a is fixed on the welding side of the joint, a clamp b is fixed on the welding side of the pipeline, and supports are fixed on two sides of the clamp a and the clamp b and are arranged at intervals; gears are arranged at intervals of the supports, tungsten electrodes are arranged on the gears, the extending heights of the tungsten electrodes can be adjusted, and the rotating angle of the tungsten electrodes is 375-385 degrees; the whole clamping device is electrically connected with a welding power supply through a connecting wire; the pipeline comprises a bent pipe and a straight pipe.
Compared with the prior art, the invention has the advantages that: the invention does not need manual argon tungsten-arc welding process with great operation difficulty, does not need skilled welders, can realize full-position automatic welding technology by fixing pipelines and joints and filling welding wires, and has the advantages of small input of pulse welding heat, high weld quality and consistency, high welding efficiency and low requirement on the skill of workers.
additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a front view of an automatic full-position welding device.
Shown in the figure: 1, supporting; 2, a gear; 3, a tungsten electrode; 4, a joint; 5, clamping a; 6, clamping a; 7 pipelines; 8 connecting lines; 9 welding power supply.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
the full-position automatic welding technology for the joint of the liquefied natural gas cylinder pipeline for the vehicle is characterized in that a welding object is welded through a full-position automatic welding device, and the welding object is a joint 4 and a pipeline 7; the method comprises the following steps:
Firstly, assembling a joint 4 or a pipeline 7 in a clamp a5, assembling the pipeline 7 in a clamp b6, installing a tungsten electrode 3 on a gear 2, centering the tungsten electrode 3 on a butt weld of the pipeline 7 and the pipeline 7 on the center of a weld, and centering the tungsten electrode 3 on the end face of the joint 4 on an insertion weld of the pipeline 7 and the joint 4;
step two, adjusting the height of the tungsten electrode 3 to be proper;
And step three, setting a rotation angle of the tungsten electrode 3 on the welding power supply 9 according to the wall thicknesses of the pipeline 7 and the joint 4, wherein the rotation angle is between 375-385 degrees, respectively setting welding parameters in four intervals, introducing protective gas from the end face of the joint 4 or the pipeline 7, starting the welding power supply 9, stopping the tungsten electrode 3 after rotating for a preset angle along a welding object, extinguishing the electric arc, completing the welding process, and detaching the joint 4 or the pipeline 7 from the fixture.
The all-position automatic welding technology can be applied to the fillet weld of the joint of the pipeline inside the gas cylinder body, and can also be applied to the butt weld of the pipeline and the joint fillet weld of the pipeline and the joint of the pipeline of the external assembly pipeline of the gas cylinder.
When the pipeline 7 is a bent pipe, an inner hole clamp matched with the curved surface of the pipeline 7 is manufactured, and the curved surface of the inner hole clamp is matched with the curved surface of the clamping position of the pipeline 7.
The height of the tungsten electrode 3 is adjusted according to the diameter of a welding object, and the distance between the tungsten electrode 3 and the surface of a welding seam is 2 mm.
the pipeline 7 and the pipeline butt welding seam tungsten electrode 3 are centered at the center of the welding seam, and the pipeline 7 and the joint splicing welding seam tungsten electrode 3 are centered at the end face of the joint.
the welding object is fixed, the tungsten electrode 3 rotates to a preset angle, welding wires are not filled, and the arc closing position is overlapped with the arc starting position by more than 5 mm.
The welding seam and the welding object are in smooth transition and orderly fusion.
The fillet weld joint welding technology in the all-position automatic welding technology can be applied to the weld joints of other pipelines and joints in an inserting manner.
The material of the pipeline 7 and the joint 4 in the all-position automatic welding technology is austenitic stainless steel.
Example 1
Fig. 1 is a technical explanatory diagram of an all-position automatic welding technique for a joint of a vehicle lng tank pipeline. The full-position automatic welding device comprises a support 1, a gear 2, a tungsten electrode 3, a clamp a5, a clamp b6, a connecting wire 8 and a welding power supply 9.
A clamp a5 is fixed on the welding side of the joint 4, a clamp b6 is fixed on the welding side of the pipeline 7, supports 1 are fixed on two sides of the clamp a5 and the clamp b6, and the supports 1 are arranged at intervals; gears 2 are arranged at intervals of the supports 1, tungsten electrodes 3 are arranged on the gears 1, the extending heights of the tungsten electrodes 3 can be adjusted, and the rotating angle of the tungsten electrodes 3 is 375-385 degrees; one end of the gear 2 is electrically connected to a welding power supply 9 via a connection line 8.
The integral curved surfaces of the joint 4 and the pipeline 7 comprise a linear curved surface and a curved surface; the pipeline 7 comprises a bent pipe and a straight pipe.
fitting the connector 4 in the clamp a5, and fitting the pipeline 7 in the clamp a 5; a pipeline 7 is arranged in a clamp b6, a tungsten electrode 3 is arranged on a gear 2, the height of the tungsten electrode 3 can be adjusted, the tungsten electrode 3 of a butt welding seam of the pipeline 7 and the pipeline 7 is centered at the center of the welding seam, and the tungsten electrode 3 of an insertion welding seam of the pipeline 7 and a joint 4 is centered at the end face of the joint 4. Setting a rotation angle (375-.
Fig. 1 shows that the welding technique can realize all-position automatic welding of butt weld seams of the pipeline 7 and the pipeline 7, and can also realize all-position automatic welding of fillet weld seams of the pipeline 7 and the joint 4;
fig. 1 shows that, in the welding technology, when the pipeline 7 is a bent pipe, an inner hole clamp matched with the curved surface of the pipeline 7 is manufactured, so that the all-position automatic welding of the joint 4 and the curved-surface pipeline 7 can be realized;
Fig. 1 shows that, in the welding technique, when the pipe 7 and the joint 4 are welded together at all angles and automatically, the tungsten electrode 3 is centered on the end face of the joint 4 and is 2mm away from the surface of the joint 4.
Example 2
The full position automatic welding technique for the pipe joint of the vehicle liquefied natural gas cylinder comprises the following steps: the device comprises a support 1, an inner hole clamp for fixing a pipeline 7 and a joint 4, a tungsten electrode 3, a gear 2 for mounting the tungsten electrode 3 and a welding power supply 9. Adopting pulse current, dividing welding parameters into four intervals, melting welding object metal for welding at high current, maintaining electric arc at low current and cooling welding seams; the butt welding seam tungsten electrode 3 of the pipeline 7 and the pipeline 7 is centered at the center of the welding seam, the pipeline 7 and the joint 4 are inserted, the welding seam tungsten electrode 3 is centered at the end face of the joint 4, no wire is filled, the welding object is fixed, the tungsten electrode 3 rotates for a circle along the welding object to complete welding, no spot welding is needed before welding, and argon is introduced to the back of the welding seam for protection; when the pipeline 7 is a bent pipe, an inner hole clamp matched with the curved surface of the pipeline 7 is manufactured, and therefore all-position automatic welding of the joint 4 and the curved-surface pipeline 7 can be achieved. The welding seam is beautiful in forming, neat in fusion and smooth in transition between the welding seam and a welding object; effectively guarantee welding quality and uniformity, improve welding efficiency, only need a welding operative employee.
Although the embodiments have been described, once the basic inventive concept is obtained, other variations and modifications of these embodiments can be made by those skilled in the art, so that the above embodiments are only examples of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes using the contents of the present specification and drawings, or any other related technical fields, which are directly or indirectly applied thereto, are included in the scope of the present invention.
Claims (10)
1. The full-position automatic welding technology for the joint of the liquefied natural gas cylinder pipeline for the vehicle is characterized in that a welding object is welded through a full-position automatic welding device, and the welding object is a joint (4) and a pipeline (7); the method is characterized in that: the method comprises the following steps:
Firstly, assembling a joint (4) in a clamp a (5), assembling a pipeline (7) in a clamp b (6), installing a tungsten electrode (3) on a gear (2), centering the tungsten electrode (3) on a butt welding seam of the pipeline (7) and the pipeline (7) at the center of the welding seam, and centering the tungsten electrode (3) on the end surface of the joint (4) on an insertion welding seam of the pipeline (7) and the joint (4);
Step two, adjusting the height of the tungsten electrode (3) to be proper;
And thirdly, setting a rotation angle of the tungsten electrode (3) on the welding power supply (9) according to the wall thicknesses of the pipeline (7) and the joint (4), setting welding parameters in four intervals respectively when the rotation angle is between 375 and 385 degrees, introducing back protective gas from the end face of the joint (4) or the pipeline (7), starting the welding power supply (9), stopping the tungsten electrode (3) after rotating for a preset angle along a welding object, extinguishing electric arcs, completing the welding process, and detaching the joint (4) or the pipeline (7) from the clamp.
2. The all-position automatic welding technology for the automotive liquefied natural gas cylinder pipeline joint according to claim 1, characterized in that: the all-position automatic welding technology can be applied to the fillet weld of the joint of the pipeline inside the gas cylinder body, and can also be applied to the butt weld of the pipeline and the joint fillet weld of the pipeline and the joint of the pipeline of the external assembly pipeline of the gas cylinder.
3. the all-position automatic welding technology for the automotive liquefied natural gas cylinder pipeline joint according to claim 1, characterized in that: when the pipeline (7) is a bent pipe, an inner hole clamp matched with the curved surface of the pipeline (7) is manufactured, and the curved surface of the inner hole clamp is matched with the curved surface of the clamping position of the pipeline (7).
4. the all-position automatic welding technology for the automotive liquefied natural gas cylinder pipeline joint according to claim 1, characterized in that: the height of the tungsten electrode (3) is adjusted according to the diameter of a welding object, and the distance between the tungsten electrode (3) and the surface of a welding seam is 2 mm.
5. The all-position automatic welding technology for the automotive liquefied natural gas cylinder pipeline joint according to claim 1, characterized in that: the pipeline (7) and the pipeline butt welding seam tungsten electrode (3) are centered at the center of the welding seam, and the pipeline (7) and the joint splicing welding seam tungsten electrode (3) are centered at the end face of the joint.
6. The all-position automatic welding technology for the automotive liquefied natural gas cylinder pipeline joint according to claim 1, characterized in that: the welding object is fixed, the tungsten electrode (3) rotates to a preset angle, welding wires are not filled, and the arc closing position is overlapped with the arc striking position by more than 5 mm.
7. The all-position automatic welding technology for the automotive liquefied natural gas cylinder pipeline joint according to claim 1, characterized in that: the welding seam and the welding object are in smooth transition and orderly fusion.
8. The all-position automatic welding technology for the automotive liquefied natural gas cylinder pipeline joint according to claim 1, characterized in that: the fillet weld joint welding technology in the all-position automatic welding technology can be applied to the weld joints of other pipelines and joints in an inserting manner.
9. The all-position automatic welding technology for the automotive liquefied natural gas cylinder pipeline joint according to claim 1, characterized in that: the material of the pipeline (7) and the joint (4) in the all-position automatic welding technology is austenitic stainless steel.
10. The all-position automatic welding technology for the automotive liquefied natural gas cylinder pipeline joint according to claim 1, characterized in that: the all-position automatic welding device comprises a support (1), a gear (2), a tungsten electrode (3), a clamp a (5), a clamp b (6), a connecting wire (8) and a welding power supply (9);
A clamp a (5) is fixed on the welding side of the joint (4), a clamp b (6) is fixed on the welding side of the pipeline (7), supports (1) are fixed on two sides of the clamp a (5) and the clamp b (6), and the supports (1) are arranged at intervals; gears (2) are arranged at intervals of the supports (1), tungsten electrodes (3) are mounted on the gears (2), the extending heights of the tungsten electrodes (3) can be adjusted, and the rotating angle of the tungsten electrodes (3) is set to be 375-385 degrees; the whole clamping device is electrically connected with a welding power supply (9) through a connecting wire (8);
the pipeline (7) comprises a bent pipe and a straight pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810528676.6A CN110539058A (en) | 2018-05-29 | 2018-05-29 | All-position automatic welding technology for automotive liquefied natural gas cylinder pipeline joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810528676.6A CN110539058A (en) | 2018-05-29 | 2018-05-29 | All-position automatic welding technology for automotive liquefied natural gas cylinder pipeline joint |
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| Publication Number | Publication Date |
|---|---|
| CN110539058A true CN110539058A (en) | 2019-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810528676.6A Pending CN110539058A (en) | 2018-05-29 | 2018-05-29 | All-position automatic welding technology for automotive liquefied natural gas cylinder pipeline joint |
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| CN (1) | CN110539058A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112589240A (en) * | 2020-12-16 | 2021-04-02 | 摩丁热能技术(无锡)有限公司 | Automatic welding process for stainless steel pipes |
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| CN104741741A (en) * | 2015-03-27 | 2015-07-01 | 西安石油大学 | Automatic tube butt joint all-position TIG welding technology for coiled tubing |
| CN106312262A (en) * | 2016-10-20 | 2017-01-11 | 西安华杰管道有限公司 | TIG welding technique for butt welding of thin-walled stainless steel tubes |
| CN208840678U (en) * | 2018-05-29 | 2019-05-10 | 西安德森新能源装备有限公司 | Vehicular liquefied natural gas cylinder pipe joint all position automatic welding device |
-
2018
- 2018-05-29 CN CN201810528676.6A patent/CN110539058A/en active Pending
Patent Citations (6)
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| CN1810429A (en) * | 2006-02-16 | 2006-08-02 | 苏州工业园区华焊科技有限公司 | Automatic pipe butt welding method |
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