CN109822286B - Cross sliding top type liner device for pipeline welding - Google Patents
Cross sliding top type liner device for pipeline welding Download PDFInfo
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- CN109822286B CN109822286B CN201910236368.0A CN201910236368A CN109822286B CN 109822286 B CN109822286 B CN 109822286B CN 201910236368 A CN201910236368 A CN 201910236368A CN 109822286 B CN109822286 B CN 109822286B
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Abstract
A cross sliding top type gasket device for pipeline welding. The main purpose is to provide a liner device which can be applied to the welding construction of medium and small-diameter pipelines. The method is characterized in that: the device comprises a front supporting cylinder, a cross sliding frame, a small arc liner, a large arc liner, a split slideway, a slideway closure plate, a positioning pin, a slideway screw, a nut, a slideway spring, a guide wheel seat, a small guide wheel, a small pin shaft, a long connecting cylinder, a push-pull rod, a sliding frame screw, a push-pull handle, a wear-reducing ring, a clamping head, a clamping spring and a fixed handle; wherein, four arc-shaped gaskets are adopted to replace a plurality of block-shaped gaskets for plugging. The liner device has small radial size, can be applied to the welding of small-caliber pipelines, has simple structure and very convenient operation, can improve the working efficiency of welding, and has a guide wheel to realize the function of pipeline alignment.
Description
Technical Field
The invention relates to a gasket device for welding a pipeline.
Background
The use of a weld pad can greatly improve the quality of the weld. At present, pipeline welding mouth-aligning devices with gasket parts are developed at home and abroad, and the gasket technology is applied to the welding process of large-diameter pipelines. However, the medium and small caliber pipeline cannot be installed in a pipeline welding butt joint device with a complex structure due to the narrow radial space. Therefore, no mature liner device is applied in the welding process of the medium and small caliber pipeline.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a cross sliding roof type gasket device with a smaller radial size, which can be applied to the welding construction of pipelines with middle and small calibers and has the advantages of simple structure and convenient use.
The technical scheme of the invention is as follows: the cross sliding top type liner device for pipeline welding comprises a front supporting cylinder, a cross sliding frame, a small arc liner, a large arc liner, a split slideway, a slideway closure plate, a positioning pin, a slideway screw, a nut, a slideway spring, a guide wheel seat, a small guide wheel, a small pin shaft, a long connecting cylinder, a push-pull rod, a sliding frame screw, a push-pull handle, an anti-friction ring, a clamping lock head, a clamping lock spring and a fixed handle; the front supporting cylinder is a short cylinder and is used for supporting the front part of the device; the rear end face of the front support cylinder is in a flange shape and is connected with the front end face flange of the long connecting cylinder through a slide way screw;
the cross sliding frame is a cross sliding body, four crisscross ribs are divided into two groups, an upper rib and a lower rib are one group, and a left rib and a right rib are one group; the outer edges of the upper and lower ribs are smooth transition step surfaces, the section with shorter radial distance is used for shrinking the small arc liner, and the section with longer radial distance is used for expanding the small arc liner; the outer edges of the left and right ribs are smooth transition step surfaces, the section with shorter radial distance is used for contraction of the large arc liner, and the section with longer radial distance is used for expansion of the large arc liner; the axial positions of the step surfaces of the upper and lower ribs and the left and right ribs are different, so that the small-arc liner and the large-arc liner are pressed and expanded in stages when the cross sliding frame slides to different positions; the rear end face of the cross sliding frame is a circular plate with four threaded holes and is connected with the push-pull rod through a sliding frame screw;
the two small arc liners are welded together by a small arc body and a small strip-shaped plate; the small arc-shaped body is used for plugging a welding groove, and the small strip-shaped plate slides in the split slide way; the two large arc liners are welded together with a small strip-shaped plate in the shape of a large arc body; the large arc-shaped body is used for plugging a welding groove, and the small strip-shaped plate slides in the split slideway; the two small arc liners are arranged up and down, and the two large arc liners are arranged left and right; when the four arc-shaped gaskets are pressed and expanded by the cross sliding frame, the four arc-shaped gaskets form a complete annular body to block the welding groove;
the split slideway is formed by cutting and drilling a circular plate into four small blocks, and combining the small blocks into the slideway of the arc-shaped gasket; each block is provided with two small holes for inserting positioning pins and is fixed on the slideway closure plate; each block is provided with two larger holes for penetrating through a slideway screw and fixed on the flange surfaces of the front support cylinder and the long connecting cylinder;
the slideway closure plate is two circular plates, and a cross groove is processed in the middle of each plate and is used for penetrating through the cross sliding frame; 4 groups of small holes are processed at four corners of the plate, 4 holes are arranged in each group, 2 smaller holes are used for penetrating positioning pins, and 2 larger holes are used for penetrating slideway screws; the two slide way blocking plates are arranged on the front surface and the rear surface of the split slide way and clamp the split slide way, the slide way spring and the strip-shaped plate of the arc-shaped gasket to form a sliding channel of the arc-shaped gasket;
the positioning pins are 8 cylindrical pins and are used for connecting and positioning the two slide way blocking plates and the four split slide ways; the slide way screw is 8 inner hexagon screws, and the slide way blocking plate, the split slide way, the front support cylinder and the long connecting cylinder are connected into a whole together with 8 nuts; the slideway spring is an 8-small compression spring, is arranged in the slideway and is used for jacking the arc-shaped liner to contract;
the guide wheel seat is a small short cylinder, and one side of the guide wheel seat is longitudinally grooved and transversely drilled and is used for mounting a small guide wheel and a small pin shaft; the other side of the guide wheel seat is welded on the front support cylinder or the long connecting cylinder; the guide wheel seat, the small guide wheel and the small pin shaft form a sliding part arranged in the pipeline, the sliding part is divided into 8 groups, 4 groups are arranged on the front supporting cylinder, 4 groups are arranged on the long connecting cylinder, and the guide wheel seat, the small guide wheel and the small pin shaft have the function of restraining the steel pipe to be centered;
the long connecting cylinder is a long cylinder, and the length of the long connecting cylinder is greater than that of the steel pipe; the front end face of the long connecting cylinder is flange-shaped and is connected with the flange on the rear end face of the front supporting cylinder through a slide way screw; the rear part of the long connecting cylinder is provided with a groove up and down, the upper part of the long connecting cylinder is in a key groove shape and is used for penetrating the push-pull handle, and two holes at the lower part of the long connecting cylinder are communicated with a narrow groove and are used for locking the locking head;
the push-pull rod is in a slender rod shape, the length of the push-pull rod is slightly smaller than that of the long connecting cylinder, and the push-pull rod is used for pushing and pulling the cross sliding frame to axially move; the front end of the push-pull rod is in a small flange shape and is connected with the cross sliding frame through a sliding frame screw; the rear end of the push-pull rod is provided with a thick lateral drilling hole for penetrating a push-pull handle; the push-pull handle is in a small rod shape and is used for pushing the push-pull rod to move; the lower part of the push-pull handle is provided with a threaded hole for connecting a locking head;
the antifriction ring is a circular ring made of copper alloy material, is sleeved on the push-pull handle and is used for reducing the frictional resistance between the antifriction ring and the inner wall of the long connecting cylinder;
the locking head is a small short cylinder, and external threads are processed at the upper part of the locking head and are used for being installed in a threaded hole at the lower part of the push-pull handle; the lower part of the locking head is a stepped cylindrical surface and is used for being locked in a lower side hole at the rear part of the long connecting cylinder; the locking spring is a small compression spring and is used for jacking and locking the locking head for self-locking;
the fixed handle is formed by bending a thin cylinder, is welded at the tail part of the long connecting cylinder and is used for controlling the axial movement of the device.
The invention has the following beneficial effects: the liner device has smaller radial size and can be suitable for medium and small-caliber pipelines; four arc-shaped gaskets are adopted to replace a plurality of block-shaped gaskets, so that the groove plugging effect is better; in addition, the liner device is provided with a guide wheel, so that the function of aligning the pipeline can be realized. The gasket device has a simple structure, is very convenient to operate, and can improve the working efficiency of welding.
Description of the drawings:
FIG. 1 is a cross-sectional view of a gasket device;
FIG. 2 is an axial cross-sectional view of the apparatus with the liner of the conduit radially contracted;
FIG. 3 is an axial cross-sectional view of the apparatus with the liner radially sliding on top in the conduit;
FIG. 4 is a cross-sectional view of the liner in the conduit fully collapsed;
FIG. 5 is a cross-sectional view of a large arc liner sliding roof in a pipeline;
FIG. 6 is a cross-sectional view of the liner in the conduit with the liner fully sliding on top;
FIG. 7 is a perspective view of the cross carriage;
FIG. 8 is an assembled view of the split runner;
FIG. 9 is a front view of the chute closure;
FIG. 10 is a perspective view of a small arc liner;
FIG. 11 is a perspective view of a large arc liner;
FIG. 12 is a cut-away front view of the long connector barrel;
FIG. 13 is a bottom view of the elongated connector barrel;
FIG. 14 is a top view of the elongated connector barrel;
FIG. 15 is a left side view of the long connector barrel;
FIG. 16 is a front view of the push-pull rod;
FIG. 17 is a cross-sectional view of a stator component in a duct;
FIG. 18 is a cross-sectional view of a idler assembly;
FIG. 19 is a partial cross-sectional view of a rear part of the device;
FIG. 20 is a front view of the latch head;
fig. 21 is a front view of the push-pull rod.
In the figure: 1. a front support cylinder; 2. a cross carriage; 3. a small arc liner; 4. a long connecting cylinder; 5. a guide wheel seat; 6. a small guide wheel; 7. a small pin shaft; 8. a push-pull rod; 9. a push-pull handle; 10. a wear ring; 11. fixing a handle; 12. a locking head; 13. a latch spring; 14. a carriage screw; 15. a nut; 16. a slideway closure plate; 17. a slideway screw; 18. positioning pins; 19. a split slideway; 20. a slide spring; 21. a large arc liner; 22. a pipeline; 23. and (7) welding seams.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1 to 21, the apparatus comprises: the device comprises a front supporting cylinder, a cross sliding frame, a small arc liner, a large arc liner, a split slideway, a slideway closure plate, a positioning pin, a slideway screw, a nut, a slideway spring, a guide wheel seat, a small guide wheel, a small pin shaft, a long connecting cylinder, a push-pull rod, a sliding frame screw, a push-pull handle, a wear-reducing ring, a clamping lock head, a clamping spring and a fixed handle.
The front supporting cylinder is a short cylinder and is used for supporting the front part of the device; the rear end face of the front support cylinder is flange-shaped and is connected with the flange on the front end face of the long connecting cylinder through a slide way screw.
The cross sliding frame is a cross sliding body, four crisscross ribs are divided into two groups, an upper rib and a lower rib are one group, and a left rib and a right rib are one group; the outer edges of the upper and lower ribs are smooth transition step surfaces, the section with shorter radial distance is used for shrinking the small arc liner, and the section with longer radial distance is used for expanding the small arc liner; the outer edges of the left and right ribs are smooth transition step surfaces, the section with shorter radial distance is used for contraction of the large arc liner, and the section with longer radial distance is used for expansion of the large arc liner; the axial positions of the stepped surfaces of the upper rib, the lower rib and the left rib and the right rib are different, so that the small arc liner and the large arc liner are pressed and expanded in stages when the cross sliding frame slides to different positions. The rear end face of the cross sliding frame is a circular plate with four threaded holes and is connected with the push-pull rod through a sliding frame screw.
The two small arc liners are made of copper alloy materials, and the liners are welded together by a small arc body and a small strip-shaped plate; the smaller arc-shaped body is used for plugging the welding groove, and the small strip-shaped plate slides in the split slide way.
The two large-arc liners are made of copper alloy materials, and the liners are welded together by a large arc body and a small strip-shaped plate; the larger arc-shaped body is used for plugging the welding groove, and the small strip-shaped plate slides in the split slide way.
The two small arc liners are arranged up and down, and the two large arc liners are arranged left and right; when the four arc-shaped gaskets are pressed and expanded by the cross sliding frame, the four arc-shaped gaskets form a complete annular body to block the welding groove.
The split slideway is formed by cutting and drilling a circular plate into four small blocks, and combining the small blocks into the slideway of the arc-shaped gasket; each block is provided with two small holes for inserting positioning pins and is fixed on the slideway closure plate; each block is provided with two larger holes for penetrating through the slide way screws and fixed on the flange surfaces of the front support cylinder and the long connecting cylinder.
The slideway closure plate is two circular plates, and a cross groove is processed in the middle of each plate and is used for penetrating through the cross sliding frame; 4 groups of small holes are processed at four corners of the plate, 4 holes are arranged in each group, 2 smaller holes are used for penetrating positioning pins, and 2 larger holes are used for penetrating slideway screws; the two slide way blocking plates are arranged on the front surface and the rear surface of the split slide way and clamp the split slide way, the slide way spring and the strip-shaped plate of the arc-shaped gasket to form a sliding channel of the arc-shaped gasket.
The positioning pins are 8 cylindrical pins and are used for connecting and positioning the two slide blocking plates and the four split slides.
The slide way screw is 8 socket head cap screws, and is connected with 8 nuts to form a whole together with the slide way plugging plate, the split slide way, the front support cylinder and the long connecting cylinder.
The slideway spring is 8 small compression springs, is arranged in the slideway and is used for jacking the arc-shaped gasket to contract.
The guide wheel seat is a small short cylinder, and one side of the guide wheel seat is longitudinally grooved and transversely drilled and is used for mounting a small guide wheel and a small pin shaft; the other side of the guide wheel seat is welded on the front support cylinder or the long connecting cylinder.
The guide wheel seat, the small guide wheel and the small pin shaft form a sliding part arranged in the pipeline, the sliding part is totally 8 groups, 4 groups are arranged on the front supporting cylinder, 4 groups are arranged on the long connecting cylinder, and the guide wheel seat, the small guide wheel and the small pin shaft have the function of restraining the steel pipe to be centered.
The long connecting cylinder is a long cylinder, and the length of the long connecting cylinder is greater than that of the steel pipe; the front end face of the long connecting cylinder is flange-shaped and is connected with the flange on the rear end face of the front supporting cylinder through a slide way screw; the rear part of the long connecting cylinder is provided with a groove from top to bottom, the upper part of the long connecting cylinder is in a key groove shape and is used for penetrating the push-pull handle, and the lower part of the long connecting cylinder is provided with two holes communicated with a narrow groove and used for locking the locking head.
The push-pull rod is in a slender rod shape, the length of the push-pull rod is slightly smaller than that of the long connecting cylinder, and the push-pull rod is used for pushing and pulling the cross sliding frame to axially move; the front end of the push-pull rod is in a small flange shape and is connected with the cross sliding frame through a sliding frame screw; the rear end of the push-pull rod is provided with a thick lateral drilling hole for penetrating the push-pull handle.
The push-pull handle is in a small rod shape and is used for pushing the push-pull rod to move; the lower part of the push-pull handle is provided with a threaded hole for connecting a locking head.
The antifriction ring is a circular ring made of copper alloy material, is sleeved on the push-pull handle and is used for reducing the frictional resistance between the antifriction ring and the inner wall of the long connecting cylinder.
The locking head is a small short cylinder, and external threads are processed at the upper part of the locking head and are used for being installed in a threaded hole at the lower part of the push-pull handle; the lower part of the locking head is a stepped cylindrical surface and is used for being locked in a lower side hole at the rear part of the long connecting cylinder.
The locking spring is a small compression spring and is used for jacking and locking the locking head for self-locking.
The fixed handle is formed by bending a thin cylinder, is welded at the tail part of the long connecting cylinder and is used for controlling the axial movement of the device.
The operation process of the device is as follows:
firstly, before the liner device is placed into a pipeline, the fixed handle is held, the push-pull handle is pulled backwards, and the clamping lock head is clamped in a rear hole at the lower side of the rear part of the long connecting cylinder; at the moment, the push-pull rod drives the cross sliding frame to move backwards, and the four arc-shaped gaskets radially contract under the action of the springs; and then, placing the gasket device into the steel pipe to be welded, pushing the gasket device into the welding groove, and aligning the two steel pipes by the two groups of guide wheels. See fig. 2 and 4.
Secondly, the push-pull handle is lifted, and the locking head is pulled out from a rear hole at the lower side of the rear part of the long connecting cylinder to be unlocked; the push-pull handle is pushed forwards, so that the clamping lock head is clamped in a front hole at the lower side of the rear part of the long connecting cylinder; at the moment, the push-pull rod drives the cross sliding frame to move forwards, and then the large arc gasket and the small arc gasket are sequentially radially jacked and expanded to block the pipeline slope; and then performing pipeline welding operation. See fig. 3, 5 and 6.
Thirdly, after welding is finished, the push-pull handle is lifted and pulled backwards, and the clamping lock head is clamped in a lower rear hole in the rear part of the long connecting cylinder; at the moment, the push-pull rod drives the cross sliding frame to move backwards, and the four arc-shaped gaskets contract radially to realize the separation of the four arc-shaped gaskets and the welding line; and finally, the pad device is drawn out of the pipeline.
Claims (1)
1. A cross sliding top type liner device for pipeline welding comprises a front supporting cylinder, a cross sliding frame, a small arc liner, a large arc liner, a split slideway, a slideway closure plate, a positioning pin, a slideway screw, a nut, a slideway spring, a guide wheel seat, a small guide wheel, a small pin shaft, a long connecting cylinder, a push-pull rod, a sliding frame screw, a push-pull handle, an anti-friction ring, a lock head, a lock spring and a fixed handle; the method is characterized in that:
the front supporting cylinder is a short cylinder and is used for supporting the front part of the device; the rear end face of the front support cylinder is in a flange shape and is connected with the front end face flange of the long connecting cylinder through a slide way screw;
the cross sliding frame is a cross sliding body, four crisscross ribs are divided into two groups, an upper rib and a lower rib are one group, and a left rib and a right rib are one group; the outer edges of the upper and lower ribs are smooth transition step surfaces, the section with shorter radial distance is used for shrinking the small arc liner, and the section with longer radial distance is used for expanding the small arc liner; the outer edges of the left and right ribs are smooth transition step surfaces, the section with shorter radial distance is used for contraction of the large arc liner, and the section with longer radial distance is used for expansion of the large arc liner; the axial positions of the step surfaces of the upper and lower ribs and the left and right ribs are different, so that the small-arc liner and the large-arc liner are pressed and expanded in stages when the cross sliding frame slides to different positions; the rear end face of the cross sliding frame is a circular plate with four threaded holes, and the circular plate is connected with the push-pull rod through a sliding frame screw;
the two small arc liners are welded together by a small arc body and a small strip-shaped plate; the small arc-shaped body is used for plugging a welding groove, and the small strip-shaped plate slides in the split slide way; the two large arc liners are welded together with a small strip-shaped plate in the shape of a large arc body; the large arc-shaped body is used for plugging a welding groove, and the small strip-shaped plate slides in the split slideway; the two small arc liners are arranged up and down, and the two large arc liners are arranged left and right; when the four arc-shaped gaskets are pressed and expanded by the cross sliding frame, the four arc-shaped gaskets form a complete annular body to block the welding groove;
the split slideway is formed by cutting and drilling a circular plate into four small blocks, and combining the small blocks into the slideway of the arc-shaped gasket; each block is provided with two small holes for inserting positioning pins to fix the split slideway on the slideway closure plate; each block is provided with two larger holes for penetrating a slideway screw to fix the split slideway on the flange surfaces of the front support cylinder and the long connecting cylinder;
the slideway closure plate is two circular plates, and a cross groove is processed in the middle of each plate and is used for penetrating through the cross sliding frame; 4 groups of small holes are processed at four corners of the plate, 4 holes are arranged in each group, 2 smaller holes are used for penetrating positioning pins, and 2 larger holes are used for penetrating slideway screws; the two slide way blocking plates are arranged on the front surface and the rear surface of the split slide way and clamp the split slide way, the slide way spring and the strip-shaped plate of the arc-shaped gasket to form a sliding channel of the arc-shaped gasket;
the positioning pins are 8 cylindrical pins and are used for connecting and positioning the two slide way blocking plates and the four split slide ways; the slide way screw is 8 inner hexagon screws, and the slide way blocking plate, the split slide way, the front support cylinder and the long connecting cylinder are connected into a whole together with 8 nuts; the slideway spring is an 8-small compression spring, is arranged in the slideway and is used for jacking the arc-shaped liner to contract;
the guide wheel seat is a small short cylinder, and one side of the guide wheel seat is longitudinally grooved and transversely drilled and is used for mounting a small guide wheel and a small pin shaft; the other side of the guide wheel seat is welded on the front support cylinder or the long connecting cylinder; the guide wheel seat, the small guide wheel and the small pin shaft form a sliding part arranged in the pipeline, the sliding part is divided into 8 groups, 4 groups are arranged on the front supporting cylinder, 4 groups are arranged on the long connecting cylinder, and the guide wheel seat, the small guide wheel and the small pin shaft have the function of restraining the steel pipe to be centered;
the long connecting cylinder is a long cylinder, and the length of the long connecting cylinder is greater than that of the steel pipe; the rear part of the long connecting cylinder is provided with a groove up and down, the upper part of the long connecting cylinder is in a key groove shape and is used for penetrating the push-pull handle, and two holes at the lower part of the long connecting cylinder are communicated with a narrow groove and are used for locking the locking head;
the push-pull rod is in a slender rod shape, the length of the push-pull rod is slightly smaller than that of the long connecting cylinder, and the push-pull rod is used for pushing and pulling the cross sliding frame to axially move; the front end of the push-pull rod is in a small flange shape and is connected with the cross sliding frame through a sliding frame screw; the rear end of the push-pull rod is provided with a thick lateral drilling hole for penetrating a push-pull handle; the push-pull handle is in a small rod shape and is used for pushing the push-pull rod to move; the lower part of the push-pull handle is provided with a threaded hole for connecting a locking head;
the antifriction ring is a circular ring made of copper alloy material, is sleeved on the push-pull handle and is used for reducing the frictional resistance between the antifriction ring and the inner wall of the long connecting cylinder;
the locking head is a small short cylinder, and external threads are processed at the upper part of the locking head and are used for being installed in a threaded hole at the lower part of the push-pull handle; the lower part of the locking head is a stepped cylindrical surface and is used for being locked in a lower hole at the rear part of the long connecting cylinder; the locking spring is a small compression spring and is used for jacking and locking the locking head for self-locking;
the fixed handle is formed by bending a thin cylinder, is welded at the tail part of the long connecting cylinder and is used for controlling the axial movement of the device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910236368.0A CN109822286B (en) | 2019-03-27 | 2019-03-27 | Cross sliding top type liner device for pipeline welding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910236368.0A CN109822286B (en) | 2019-03-27 | 2019-03-27 | Cross sliding top type liner device for pipeline welding |
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| CN109822286B true CN109822286B (en) | 2020-12-22 |
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| CN111715754A (en) * | 2020-07-01 | 2020-09-29 | 张宇 | Stainless steel plate seaming and curling machine |
| CN113718243A (en) * | 2021-08-09 | 2021-11-30 | 湖北超卓航空科技股份有限公司 | Method for repairing damage of sealing barrel |
| CN113714726B (en) * | 2021-08-25 | 2022-12-16 | 中国一冶集团有限公司 | Steel pipe welding liner installation auxiliary device |
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| US3806020A (en) * | 1972-05-12 | 1974-04-23 | Exxon Research Engineering Co | Apparatus for welding of pipe by use of explosives |
| CN2033724U (en) * | 1988-05-12 | 1989-03-08 | 机械工业委员会哈尔滨焊接研究所 | Retrievable padding means for butt-welded pipes |
| US5323950A (en) * | 1993-07-29 | 1994-06-28 | General Dynamics Corporation, Space Systems | Flexible, adjustable welding backup mandrel |
| JPH07314187A (en) * | 1994-05-26 | 1995-12-05 | Teikoku Chuck Kk | Centering/straightening device for welding circular pipe |
| CN107825059A (en) * | 2017-11-02 | 2018-03-23 | 东北石油大学 | Pipeline welding arc cushion device |
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2019
- 2019-03-27 CN CN201910236368.0A patent/CN109822286B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3806020A (en) * | 1972-05-12 | 1974-04-23 | Exxon Research Engineering Co | Apparatus for welding of pipe by use of explosives |
| CN2033724U (en) * | 1988-05-12 | 1989-03-08 | 机械工业委员会哈尔滨焊接研究所 | Retrievable padding means for butt-welded pipes |
| US5323950A (en) * | 1993-07-29 | 1994-06-28 | General Dynamics Corporation, Space Systems | Flexible, adjustable welding backup mandrel |
| JPH07314187A (en) * | 1994-05-26 | 1995-12-05 | Teikoku Chuck Kk | Centering/straightening device for welding circular pipe |
| CN107825059A (en) * | 2017-11-02 | 2018-03-23 | 东北石油大学 | Pipeline welding arc cushion device |
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