CN110732754A - TIG welding device for butt joint of LNG pipelines and welding method thereof - Google Patents
TIG welding device for butt joint of LNG pipelines and welding method thereof Download PDFInfo
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- CN110732754A CN110732754A CN201911182171.XA CN201911182171A CN110732754A CN 110732754 A CN110732754 A CN 110732754A CN 201911182171 A CN201911182171 A CN 201911182171A CN 110732754 A CN110732754 A CN 110732754A
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- 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
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- 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
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
- B23K9/0052—Welding of pipe panels
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- 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
- B23K9/235—Preliminary treatment
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- 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
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention relates to TIG welding devices for LNG pipeline butt joint, which are characterized by comprising an annular track, a movable trolley module and a welding module, wherein the movable trolley module is arranged on the annular track, the welding module is arranged on the movable trolley module and extends out of the annular track, the method for combining a narrow-gap groove with a hot wire TIG is adopted, the groove size is reduced in aspect, the filling amount is reduced, the welding efficiency is greatly improved, in addition, aspect, the hot wire is adopted for filling, the welding efficiency can be improved by two times compared with the common TIG welding cladding efficiency, the efficiency of the welding method adopted by the invention is greatly improved, the labor of workers is reduced, the working condition is improved, the welding trolley drives the welding, the welding wire heating and the automatic wire feeding mechanism to do circular motion around the pipeline along the track under the condition that the pipeline is relatively fixed, the parameters are only required to be set before the whole welding process, and the full-automatic operation is realized after the welding is started.
Description
Technical Field
The invention relates to the technical field of welding, in particular to TIG welding devices for butt joint of LNG pipelines and a welding method thereof.
Background
The pipeline connection is widely applied to various industries, and the pipeline joint usually has the requirement on sealing performance, so that the pipeline-pipe butt joint is a common joint form in the pipeline connection, aiming at the welding of the pipeline-pipe butt joint, the pipeline is rotated by a positioner under an ideal state without moving a welding gun, so that the welding position is in a flat welding position, the welding difficulty is lowest, but the pipeline cannot rotate in many field constructions, only a welder can perform manual welding and semi-automatic welding, usually, the butt joint of thick-wall large pipe fittings needs a digital welder to perform continuous welding for several days, and because the manual welding is influenced by various human factors and working environments, generally, the thick-wall pipe fittings are welded for multiple times, times of detection is needed after welding about 20mm, defects are discovered to be cleaned and repaired, the labor intensity of the welder is high, and more importantly, the quality of the welding seam is difficult to guarantee.
In order to reduce the adverse effect of a manual welding process on the butt joint engineering of large pipes, steps are carried out to improve the efficiency and quality of installation engineering, and researches on pipeline all-position automatic welding equipment are already carried out, for example, in the Chinese patent with the publication number of CN205290218U, adjustable all-position welding supports are designed, but can only clamp a workpiece to change the angle, in the Chinese patent with the publication numbers of CN106216902A and CN107900489A, all-position welding machines and a pipeline all-position welding method in a gradient state are designed, but how the all-position welding machines are fixed on the pipeline workpiece is not detailed in the patents, and in the Chinese patent CN104985302A, all-position pipeline welding work stations are designed, but how the feeding of welding wires is realized is not detailed.
The welding process and the equipment for the pipeline are not welded by adopting a hot wire method, and for the welding of the large-thick-wall pipeline, the welding wire is heated by an independent welding wire heating power supply and a heating device, so that the welding wire is heated to 300-500 ℃ before being sent into a molten pool; like this, increase twice than the deposition rate that adopts the cold wire to can improve welding efficiency by a wide margin, and current data still generally adopt traditional wide-angle groove to weld, increased the packing volume, reduced welding efficiency.
Disclosure of Invention
The invention aims to provide TIG welding devices and welding methods for butting LNG pipelines, which can solve the defects of the existing welding devices and welding methods for LNG pipelines.
In order to solve the technical problems, the invention adopts the technical scheme that TIG welding devices for butting LNG pipelines are innovatively characterized by comprising an annular track, a movable trolley module and a welding module, wherein the movable trolley module is arranged on the annular track, and the welding module is arranged on the movable trolley module and extends out of the annular track;
the annular rail is of a cylindrical tubular structure, rail grooves are respectively arranged on the inner walls of two ends of the annular rail along the circumferential direction, a plurality of bolt holes are uniformly distributed on the annular rail along the circumferential direction, and the axes of the bolt holes penetrate through the axes of the annular rail;
the movable trolley module comprises a movable pulley, two pairs of guide rollers, a trolley platform and a platform connecting rod, wherein the movable pulley is provided with two pairs of guide rollers, the two pairs of guide rollers are positioned on the outer wall of the annular track and are correspondingly arranged with the movable pulley, the guide rollers connect the movable pulley with the centers of the guide rollers through connecting rods, the guide rollers and the movable pulley can rotate around the connecting rods through slewing bearings, each pair of guide rollers in the two pairs of guide rollers are connected through slewing shafts, the trolley platform is arranged on the outer side of the annular track and is parallel to the slewing shafts, the platform connecting rod is provided with two pairs of platform connecting rods, the top end of each platform connecting rod is vertically connected with the bottom end of the trolley platform, and the other end of each platform connecting rod is connected with the slewing shafts through the slewing bearings;
the welding module comprises a sliding block supporting plate, a sliding chute supporting plate, a welding gun positioning seat and a welding gun; the sliding block supporting plate is of a T-shaped structure, the sliding block supporting plate is connected to the trolley platform through a bolt group, a sliding block is arranged on the sliding block supporting plate along the extending direction, and the extending direction of the sliding block on the sliding block supporting plate is perpendicular to the axis direction of the annular track; the sliding groove supporting plate is provided with a sliding groove matched with the sliding block on the sliding block supporting plate along the extending direction, and the sliding groove is provided with a locking bolt hole for locking the sliding groove supporting plate on the sliding block supporting plate; the welding gun positioning seat is arranged on the sliding chute supporting plate, and a circular hole for accommodating a welding gun is formed in the welding gun positioning seat; the welding gun is arranged on the welding gun positioning seat.
And , arranging a limiting plate on the guide roller to be clamped on the outer side of the annular track.
the welding method of the TIG welding device for the butt joint of the LNG pipelines has the innovation points that the specific welding method is as follows:
s1: processing a U-shaped groove on the pipeline to be welded, wherein the angle of the single-side groove is 10-15 degrees, the width of a blunt edge of the groove is 2-4 mm, and the thickness of the blunt edge is 1-2 mm;
s2: polishing a 20mm area of the outer wall close to the groove by using sand paper or a thousand-leaf blade to ensure that the polished area is smooth and presents metallic luster, and wiping the polished area by using absolute ethyl alcohol to ensure that no stain exists in the range of the polished area; boring the inner wall of the pipeline on the side of the groove with the thickness of 0.5mm and the length of 8-10mm to remove rust and an oxidation film on the inner wall;
s3: assembling the butt joint pipeline, wherein the assembling clearance is not more than 0.5mm, the grooves on two sides are ensured to be aligned, and the error variable is not more than 1 mm;
s4: equipping a TIG automatic welding device for butting LNG pipelines;
s5: and setting welding parameters, and performing narrow-gap hot wire TIG automatic welding on the pipeline.
And , assembling the track required by the full-position welding system to the pipeline to be welded, adjusting the clamping bolt, and ensuring that the track is fixed and concentric with the pipeline, wherein the eccentric error is not more than 2.5mm in S4.
, the welding wire is reversely wound on the pipeline to be welded in S4.
And , the welding sequence of the pipelines to be welded in the S5 includes root layer welding, filler layer welding and cover layer welding.
The invention has the advantages that:
1) in the method for combining the narrow-gap groove with the hot wire TIG, the groove size is reduced in aspects, the filling amount is reduced, and the welding efficiency is greatly improved, and in addition, the hot wire is adopted for filling in aspects, so that the welding efficiency can be improved by two times compared with the common TIG welding;
2) the welding method provided by the invention has the advantages that the efficiency is greatly improved, the labor of workers is reduced, and the working conditions are improved; meanwhile, aiming at the condition that the pipeline cannot rotate under a plurality of construction conditions, the welding trolley drives the welding, welding wire heating and automatic wire feeding mechanism to do circular motion around the pipeline along the track under the condition that the pipeline is relatively fixed; the whole welding process only needs to set parameters before starting, the welding process is fully-automatic after starting welding, and an automatic control system can adjust welding parameters according to different welding positions to realize full-position automatic welding of pipelines.
Drawings
The invention is described in further detail with reference to the figures and the detailed description.
Fig. 1 is a perspective view of TIG welding apparatuses for LNG pipeline butt joint according to the present invention.
Fig. 2 is a front view structural diagram of TIG welding devices for LNG pipeline butt joint according to the present invention.
Fig. 3 is a side view structural diagram of TIG welding devices for LNG pipeline butt joint according to the present invention.
Fig. 4 is a top view structural view of TIG welding apparatuses for LNG pipeline butt joint according to the present invention.
Detailed Description
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
The TIG welding device for LNG pipeline butt joint shown in figures 1-4 comprises an annular rail 1, a moving trolley module 2 and a welding module 3, wherein the moving trolley module 2 is arranged on the annular rail 1, and the welding module 3 is arranged on the moving trolley module 2 and extends out of the annular rail.
The annular rail 1 is of a cylindrical tubular structure, rail grooves 11 are respectively formed in the inner walls of two ends of the annular rail 1 along the circumferential direction, a plurality of bolt holes are uniformly distributed in the annular rail 1 along the circumferential direction, the axes of the bolt holes penetrate through the axis of the annular rail 1, and pipeline locking bolts 12 are arranged in the bolt holes.
The movable trolley module 2 comprises a movable pulley 21, two guide rollers 22, a trolley platform 23 and a platform connecting rod 24, wherein the movable pulley 21 is provided with two pairs, the two pairs are positioned on the inner wall of the annular track 1 and are respectively matched with the track grooves 11 at the two ends of the annular track 1, the two pairs of guide rollers 22 are positioned on the outer wall of the annular track 1 and are arranged corresponding to the movable pulley 21, the guide rollers 22 connect the movable pulley 21 with the centers of the guide rollers 22 through connecting rods, the guide rollers 22 and the movable pulley 21 can rotate around the connecting rods through slewing bearings, each pair of guide rollers 22 in the two pairs of guide rollers 22 are connected through slewing shafts, the trolley platform 23 is arranged on the outer side of the annular track 1 and is parallel to the slewing shafts, the platform connecting rods are provided with two pairs, the top ends of the platform connecting rods are vertically connected to the bottom ends of the trolley platform connecting rods, and the other ends of.
The welding module 3 comprises a slide block supporting plate 31, a chute supporting plate 32, a welding gun positioning seat 33 and a welding gun 34; the sliding block supporting plate 31 is of a T-shaped structure, the sliding block supporting plate 31 is connected to the trolley platform 23 through a bolt group, a sliding block is arranged on the sliding block supporting plate 31 along the extending direction, and the extending direction of the sliding block on the sliding block supporting plate 31 is perpendicular to the axial direction of the annular track 1; the sliding chute supporting plate 32 is provided with a sliding chute matched with the sliding block on the sliding block supporting plate 31 along the extending direction, and the sliding chute is provided with a locking bolt hole for locking the sliding chute supporting plate 32 on the sliding block supporting plate 31; the welding gun positioning seat 33 is arranged on the chute supporting plate 32, and a circular hole for accommodating a welding gun is formed in the welding gun positioning seat 33; the welding torch 34 is disposed on the torch positioning seat 33.
The guide roller is provided with a limiting plate clamped on the outer side of the annular track.
TIG welding method for LNG pipeline butt joint, the concrete welding method is as follows:
s1: processing a U-shaped groove on the pipeline to be welded, wherein the angle of the single-side groove is 10-15 degrees, the width of a blunt edge of the groove is 2-4 mm, and the thickness of the blunt edge is 1-2 mm;
s2: polishing a 20mm area of the outer wall close to the groove by using sand paper or a thousand-leaf blade to ensure that the polished area is smooth and presents metallic luster, and wiping the polished area by using absolute ethyl alcohol to ensure that no stain exists in the range of the polished area; boring the inner wall of the pipeline on the side of the groove with the thickness of 0.5mm and the length of 8-10mm to remove rust and an oxidation film on the inner wall;
s3: assembling the butt joint pipeline, wherein the assembling clearance is not more than 0.5mm, the grooves on two sides are ensured to be aligned, and the error variable is not more than 1 mm;
s4: equipping a TIG automatic welding device for butting LNG pipelines;
s5: and setting welding parameters, and performing narrow-gap hot wire TIG automatic welding on the pipeline.
And S4, assembling the track required by the all-position welding system to the pipeline to be welded, adjusting the clamping bolt, ensuring that the track is fixed and concentric with the pipeline, and ensuring that the eccentricity error does not exceed 2.5 mm.
The welding wire is reversely wound on the pipe to be welded in S4.
The welding sequence of the pipelines to be welded in the S5 is root layer welding, filler layer welding and cover layer welding.
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 (6)
- TIG welding device for LNG pipeline butt joint, which is characterized by comprising an annular track, a movable trolley module and a welding module, wherein the movable trolley module is arranged on the annular track, and the welding module is arranged on the movable trolley module and extends out of the annular track;the annular rail is of a cylindrical tubular structure, rail grooves are respectively arranged on the inner walls of two ends of the annular rail along the circumferential direction, a plurality of bolt holes are uniformly distributed on the annular rail along the circumferential direction, and the axes of the bolt holes penetrate through the axes of the annular rail;the movable trolley module comprises a movable pulley, two pairs of guide rollers, a trolley platform and a platform connecting rod, wherein the movable pulley is provided with two pairs of guide rollers, the two pairs of guide rollers are positioned on the outer wall of the annular track and are correspondingly arranged with the movable pulley, the guide rollers connect the movable pulley with the centers of the guide rollers through connecting rods, the guide rollers and the movable pulley can rotate around the connecting rods through slewing bearings, each pair of guide rollers in the two pairs of guide rollers are connected through slewing shafts, the trolley platform is arranged on the outer side of the annular track and is parallel to the slewing shafts, the platform connecting rod is provided with two pairs of platform connecting rods, the top end of each platform connecting rod is vertically connected with the bottom end of the trolley platform, and the other end of each platform connecting rod is connected with the slewing shafts through the slewing bearings;the welding module comprises a sliding block supporting plate, a sliding chute supporting plate, a welding gun positioning seat and a welding gun; the sliding block supporting plate is of a T-shaped structure, the sliding block supporting plate is connected to the trolley platform through a bolt group, a sliding block is arranged on the sliding block supporting plate along the extending direction, and the extending direction of the sliding block on the sliding block supporting plate is perpendicular to the axis direction of the annular track; the sliding groove supporting plate is provided with a sliding groove matched with the sliding block on the sliding block supporting plate along the extending direction, and the sliding groove is provided with a locking bolt hole for locking the sliding groove supporting plate on the sliding block supporting plate; the welding gun positioning seat is arranged on the sliding chute supporting plate, and a circular hole for accommodating a welding gun is formed in the welding gun positioning seat; the welding gun is arranged on the welding gun positioning seat.
- 2. A TIG welding device for butting of LNG pipelines according to claim 1, wherein the guide rollers are provided with limit plates which are clamped on the outer sides of the circular rails.
- 3, A welding method of TIG welding device for LNG pipeline butt joint according to claim 1, wherein the concrete welding method is as follows:s1: processing a U-shaped groove on the pipeline to be welded, wherein the angle of the single-side groove is 10-15 degrees, the width of a blunt edge of the groove is 2-4 mm, and the thickness of the blunt edge is 1-2 mm;s2: polishing a 20mm area of the outer wall close to the groove by using sand paper or a thousand-leaf blade to ensure that the polished area is smooth and presents metallic luster, and wiping the polished area by using absolute ethyl alcohol to ensure that no stain exists in the range of the polished area; boring the inner wall of the pipeline on the side of the groove with the thickness of 0.5mm and the length of 8-10mm to remove rust and an oxidation film on the inner wall;s3: assembling the butt joint pipeline, wherein the assembling clearance is not more than 0.5mm, the grooves on two sides are ensured to be aligned, and the error variable is not more than 1 mm;s4: equipping a TIG automatic welding device for butting LNG pipelines;s5: and setting welding parameters, and performing narrow-gap hot wire TIG automatic welding on the pipeline.
- 4. A welding method of a TIG welding device for LNG pipeline docking according to claim 3, characterized in that: in the step S4, the track required by the all-position welding system is assembled to the pipeline to be welded, the clamping bolt is adjusted, the track is ensured to be fixed and concentric with the pipeline, and the eccentricity error is not more than 2.5 mm.
- 5. A welding method of a TIG welding device for LNG pipeline docking according to claim 3, characterized in that: the S4 is reversely wound with the welding wire before being wound on the pipe to be welded.
- 6. A welding method of a TIG welding device for LNG pipeline docking according to claim 3, characterized in that: and the welding sequence of the pipelines to be welded in the S5 comprises root welding layer welding, filling welding layer welding and cover surface welding layer welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911182171.XA CN110732754A (en) | 2019-11-27 | 2019-11-27 | TIG welding device for butt joint of LNG pipelines and welding method thereof |
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| CN201911182171.XA CN110732754A (en) | 2019-11-27 | 2019-11-27 | TIG welding device for butt joint of LNG pipelines and welding method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111299765A (en) * | 2020-03-16 | 2020-06-19 | 中国建筑第八工程局有限公司 | Automatic welding method and welding equipment for steel round pipe |
| CN111604574A (en) * | 2020-05-08 | 2020-09-01 | 中国长江电力股份有限公司 | All-position automatic welding device and method for large-diameter thin-wall aluminum alloy pipeline |
| CN112496494A (en) * | 2020-11-19 | 2021-03-16 | 南京钜砼建筑工业技术研究所有限公司 | Precast pile splicing welding robot |
| CN112570856A (en) * | 2020-12-09 | 2021-03-30 | 中国石油天然气集团有限公司 | Cold and hot welding wire matching welding device and system for oil gas conveying steel pipe |
| CN112643284A (en) * | 2020-12-17 | 2021-04-13 | 衢州学院 | Welding assistor for connecting cable protection pipes |
| CN112994386A (en) * | 2021-04-06 | 2021-06-18 | 瓮福（集团）有限责任公司 | Assembling method of three-phase permanent magnet synchronous motor |
| CN114918668A (en) * | 2022-06-15 | 2022-08-19 | 中建安装集团有限公司 | Pipeline groove is polished and welding set |
| CN117415417A (en) * | 2023-11-28 | 2024-01-19 | 北京石油化工学院 | Deep water vertical pipe J-type paving transverse welding device and welding method based on rotary electric arc |
| CN117506274A (en) * | 2023-12-25 | 2024-02-06 | 江苏悦川机器人有限公司 | Annular welding robot for pipeline welding |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111299765A (en) * | 2020-03-16 | 2020-06-19 | 中国建筑第八工程局有限公司 | Automatic welding method and welding equipment for steel round pipe |
| CN111299765B (en) * | 2020-03-16 | 2024-01-23 | 中国建筑第八工程局有限公司 | Automatic welding method and welding equipment for steel round pipe |
| CN111604574A (en) * | 2020-05-08 | 2020-09-01 | 中国长江电力股份有限公司 | All-position automatic welding device and method for large-diameter thin-wall aluminum alloy pipeline |
| CN112496494A (en) * | 2020-11-19 | 2021-03-16 | 南京钜砼建筑工业技术研究所有限公司 | Precast pile splicing welding robot |
| CN112570856A (en) * | 2020-12-09 | 2021-03-30 | 中国石油天然气集团有限公司 | Cold and hot welding wire matching welding device and system for oil gas conveying steel pipe |
| CN112643284A (en) * | 2020-12-17 | 2021-04-13 | 衢州学院 | Welding assistor for connecting cable protection pipes |
| CN112994386A (en) * | 2021-04-06 | 2021-06-18 | 瓮福（集团）有限责任公司 | Assembling method of three-phase permanent magnet synchronous motor |
| CN112994386B (en) * | 2021-04-06 | 2022-07-26 | 瓮福（集团）有限责任公司 | Assembling method of three-phase permanent magnet synchronous motor |
| CN114918668A (en) * | 2022-06-15 | 2022-08-19 | 中建安装集团有限公司 | Pipeline groove is polished and welding set |
| CN114918668B (en) * | 2022-06-15 | 2023-11-28 | 中建安装集团有限公司 | Pipeline groove polishing and welding device |
| CN117415417A (en) * | 2023-11-28 | 2024-01-19 | 北京石油化工学院 | Deep water vertical pipe J-type paving transverse welding device and welding method based on rotary electric arc |
| CN117506274A (en) * | 2023-12-25 | 2024-02-06 | 江苏悦川机器人有限公司 | Annular welding robot for pipeline welding |
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