CN110802364B - Device for generating residual compressive stress of welded joint of intersecting pipe - Google Patents
Device for generating residual compressive stress of welded joint of intersecting pipe Download PDFInfo
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- CN110802364B CN110802364B CN201911204889.4A CN201911204889A CN110802364B CN 110802364 B CN110802364 B CN 110802364B CN 201911204889 A CN201911204889 A CN 201911204889A CN 110802364 B CN110802364 B CN 110802364B
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- compressive stress
- residual compressive
- fixed ring
- connecting rod
- welding
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- 238000003466 welding Methods 0.000 claims abstract description 52
- 230000007704 transition Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012549 training Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000126 substance Substances 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
The invention discloses a device for generating residual compressive stress of a welded joint of a tubular, which comprises a trunk pipe and a branch pipe which are welded into a whole and are vertically arranged, wherein the trunk pipe is sleeved with four fixed ring clamps, the four fixed ring clamps are symmetrically arranged at two sides of the branch pipe, the fixed ring clamps at two sides are vertically connected with telescopic rod structures, the two fixed ring clamps in the middle are vertically connected with vertical support rods, the branch pipe is provided with four-jaw chucks, lever members are connected between the four-jaw chucks and the upper ends of the telescopic rod structures at two sides, and the upper ends of the vertical support rods are connected with corresponding lever members to form a lever structure; when the main pipe and the branch pipe are welded, the telescopic rod structure is contracted, and the lever piece is lifted upwards to pull the four-jaw chuck to generate welding tension, so that residual compressive stress after welding is formed. The invention improves the fatigue strength of the welded joint, reduces the deformation of the welded joint and can effectively reduce the generation of welding cold cracks.
Description
Technical Field
The invention belongs to the technical field of controlling welding deformation and improving welding quality, and particularly relates to a device for improving fatigue strength, corrosion resistance and crack resistance of a welding joint and reducing residual compressive stress of the welding joint of a tubular welding joint caused by deformation of the welding joint.
Background
The welding is a common connection mode of metal materials, the variety and application of the welding are very wide, and the pipe fitting or the device is connected in a welding mode, because the welding has good air tightness; but errors in the welding process and welding parameters, pre-weld preparation, etc. may result in the weld area not achieving the desired target. The pipe fitting is widely applied to the fields of nuclear power plants, chemical industry, petroleum and natural gas transportation and the like. At present, in the welding process of the intersecting line formed by connecting two pipes, the labor intensity of workers is high, the operation environment is bad, and the welding quality cannot be ensured. It is considered to design a device for generating residual compressive stress of welded joints of intersecting pipes to improve the welding quality.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a device for improving the fatigue strength, corrosion resistance and crack resistance of a welding joint and reducing the deformation of the welding joint to generate the residual compressive stress of the welding joint of the intersecting pipe.
The technical scheme adopted by the invention is as follows:
A device for generating residual compressive stress of welded joints of intersecting pipes, characterized in that: the four-jaw welding device comprises a main pipe and a branch pipe which are welded into a whole and are vertically arranged, wherein four fixed ring clamps are sleeved on the main pipe, the four fixed ring clamps are symmetrically arranged on two sides of the branch pipe, telescopic rod structures are vertically connected to the fixed ring clamps on two sides, vertical support rods are vertically connected to the two fixed ring clamps in the middle, four-jaw chucks are arranged on the branch pipe, lever members are connected between the four-jaw chucks and the upper ends of the telescopic rod structures on two sides, and the upper ends of the vertical support rods are connected with the corresponding lever members to form a lever structure; when the main pipe and the branch pipe are welded, the telescopic rod structure is contracted, and the lever piece is lifted upwards to pull the four-jaw chuck to generate welding tension, so that residual compressive stress after welding is formed. When the main pipe and the branch pipe are welded, the telescopic rod structure and the lever structure generate a welding pulling force to form a residual compressive stress after welding, so that the fatigue strength of the welding joint is improved, the deformation of the welding joint is reduced, and the generation of welding cold cracks can be effectively reduced.
Further, the telescopic link structure includes first vertical connecting rod, through-hole sleeve pipe, the vertical connecting rod of second, the first end and the fixed ring anchor clamps threaded connection of the vertical connecting rod of first, through-hole sleeve pipe threaded connection between the first end of the vertical connecting rod of second and the vertical connecting rod of second, the second end and the lever spare hinge joint of the vertical connecting rod of second, can shorten or lengthen the telescopic link structure after the through-hole sleeve pipe is rotatory.
Further, the two ends of the through hole sleeve are provided with internal threads, and the middle part of the through hole sleeve is provided with hexagonal protrusions for screwing and rotating.
Further, a load sensor for detecting the tensile force is arranged on the second vertical connecting rod, and the tensile force of the telescopic rod structures on two sides is ensured to be consistent through the load sensor.
Further, the first end of the vertical supporting rod is in threaded connection with the fixing ring clamp, the second end of the vertical supporting rod is provided with a hinge seat, and the hinge seat is connected with the lever piece through a bolt. The invention adopts the hinge seat as the connecting device, dead points can appear when in work, and the unstable phenomenon of the rod piece in the force transmission process is avoided.
Further, the hinge base comprises an upper hinge and a lower hinge base, and the upper hinge and the lower hinge base are in medium clearance fit.
Further, the fixed ring clamp comprises two semi-ring clamps, two ends of each semi-ring clamp are connected through hexagon bolts, and a threaded hole used for being connected with a first vertical connecting rod or a vertical supporting rod is formed in the middle of one semi-ring clamp.
Further, two ends of the two semi-ring clamps are respectively provided with two symmetrically distributed fixing threaded holes, and the fixing threaded holes are connected with the hexagon bolts.
Further, four-jaw chuck includes latch, interior hexagonal top silk reform bolt and two fixed points of symmetric distribution, four-jaw chuck passes through four latch transition fit with the branch pipe, there is tooth structure at the latch bottom, and it is fixed with interior hexagonal top silk reform bolt meshing, fixed point and lever hinge joint.
Further, the main pipe is connected with the fixed ring clamp, the branch pipe and the four-jaw chuck in a transition fit manner.
The invention has the beneficial effects that: the downward pressure can be applied to the welded joint obtained after welding, so that the fatigue strength, corrosion resistance and crack resistance of the joint are improved, and the deformation of the joint is reduced. And the welded workpiece can be fixed, so that the workload of workers is reduced, and the workers are facilitated to concentrate on welding operation. In addition, the device is easy to operate, simple in structure, flexible and changeable, the installation position can be adjusted according to the size of the pipe fitting, and the training of construction staff is not needed, so that the time and the staff training cost are saved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic structural view of the telescopic rod structure of the present invention.
Fig. 3 is a schematic view of the structure of the four-jaw chuck of the present invention.
Fig. 4 is a schematic structural view of the fixing ring clamp of the present invention.
Fig. 5 is a schematic structural view of the hinge base of the present invention.
Fig. 6 is a schematic view of the structure of the hexagon socket head cap screw retrofit bolt of the present invention.
In the figure: 1-a dry pipe; 2-a fixed ring clamp; 3-a first vertical connecting rod; 4-a through-hole sleeve; 5-a load sensor; 6-a lever member; 7-a vertical support rod; 8-a hinge base; 9-four jaw chuck; 10-clamping teeth; 11-inner hexagonal top thread remanufacturing a bolt; 12-fixed point; 13-welding seams; 14-branch pipes; 15-hexagon bolts; 16-a second vertical connecting rod.
Detailed Description
The invention will be further illustrated with reference to the following specific examples, without limiting the invention to these specific embodiments. It will be appreciated by those skilled in the art that the invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Referring to fig. 1, the embodiment provides a device for generating residual compressive stress of welded joints of intersecting pipes, which comprises a main pipe 1 and a branch pipe 14 which are welded into a whole and are vertically arranged, wherein four fixed ring clamps 2 are sleeved on the main pipe 1, the four fixed ring clamps 2 are symmetrically arranged on two sides of the branch pipe 14, the fixed ring clamps 2 on two sides are vertically connected with telescopic rod structures, the two fixed ring clamps 2 in the middle are vertically connected with vertical support rods 7, the branch pipe 14 is provided with four-jaw chucks 9, lever pieces 6 are connected between the four-jaw chucks 9 and the upper ends of the telescopic rod structures on two sides, and the upper ends of the vertical support rods 7 are connected with the corresponding lever pieces 6 to form a lever structure; when the main pipe 1 and the branch pipe 14 are welded, the telescopic rod structure is contracted, and the lever piece 6 is lifted upwards to pull the four-jaw chuck 9 to generate welding tension, so that residual compressive stress after welding is formed. When the main pipe 1 and the branch pipe 14 are welded, a welding pulling force is generated through the telescopic rod structure and the lever structure to form the residual compressive stress after welding, so that the fatigue strength of the welding joint is improved, the deformation of the welding joint is reduced, and the generation of welding cold cracks can be effectively reduced.
Referring to fig. 2, the telescopic rod structure of the present embodiment includes a first vertical connecting rod 3, a through hole sleeve 4, and a second vertical connecting rod 16, two ends of the first vertical connecting rod 3 are both external screw thread structures, and one end of the second vertical connecting rod 16 is a hinge structure of one end of the external screw thread structure. The first end of the first vertical connecting rod 3 is in threaded connection with the fixed ring clamp 2, the second end of the first vertical connecting rod 3 is in threaded connection with the first end of the second vertical connecting rod 16 through the through hole sleeve 4, the second end of the second vertical connecting rod 16 is in hinged connection with the lever piece 6, and the telescopic rod structure can be shortened or lengthened after the through hole sleeve 4 rotates. The two ends of the through hole sleeve 4 are provided with internal threads, and the middle part of the through hole sleeve is provided with hexagonal protrusions for screwing and rotating. The second vertical connecting rod 16 is provided with a load sensor 5 for detecting tensile force, the load sensor 5 can adopt an SBT 641, and the tensile force of the telescopic rod structures on two sides is ensured to be consistent through the load sensor 5.
Referring to fig. 3, the four-jaw chuck 9 in this embodiment includes a latch 10, an inner hexagonal top wire modification bolt 11, and two fixing points 12 symmetrically distributed, the four-jaw chuck 9 and the branch pipe 2 are in transition fit through four latches 10, the bottom of each latch 10 has a tooth structure and is meshed and fixed with the inner hexagonal top wire modification bolt 11, the inner hexagonal top wire modification bolt 11 is in threaded connection with the four-jaw chuck 9, and a clamping groove meshed with the tooth structure at the bottom of each latch 10 is formed in the middle of the inner hexagonal top wire modification bolt, as shown in fig. 6; the fastening point 12 is connected to the lever element 6 in a hinged manner. Both ends of the lever member 6 are hinge structures.
Referring to fig. 4, the fixing ring clamp 2 in this embodiment includes two half ring clamps, two ends of the two half ring clamps are connected by a hexagon bolt 15, and a threaded hole for connecting with the first vertical connecting rod 3 or the vertical supporting rod 7 is formed in the middle of one half ring clamp. Two ends of the two semi-ring clamps are respectively provided with two symmetrically distributed fixing threaded holes, and the fixing threaded holes can be matched with the hexagon bolts 15 with the same specification. The tightness of the fixing ring clamp 2 can be adjusted by a hexagonal bolt 15.
In this embodiment, the first end of the vertical support rod 7 is in threaded connection with the fixing ring fixture 2, the second end of the vertical support rod is provided with a hinge seat 8, and the hinge seat 8 is connected with the lever member 6 through a bolt. The invention adopts the hinge seat 8 as a connecting device, dead points can appear in the working process, and the unstable phenomenon of the rod piece in the force transmission process is avoided. The hinge base 8 comprises an upper hinge and a lower hinge base, which are in medium clearance fit with each other, see fig. 5.
In the embodiment, the main pipe 1, the fixed ring clamp 2, the branch pipe 14 and the four-jaw chuck 9 are connected in a transition fit manner. The hexagonal convex outer surface of the through hole sleeve 4 should be subjected to wear-resistant treatment. Lubrication treatment should be carried out between the fixing ring clamp 2 and the external thread end of the first vertical connecting rod, between two threaded holes symmetrically distributed on the fixing ring clamp 2 and the hexagonal bolts 15, and between the first vertical connecting rod 3, the second vertical connecting rod 16 and the through hole sleeve 4.
The working process of the invention is as follows: the fixing ring clamp 2 and the four-grab chuck 9 are used for fixing the positions of the main pipe 1 and the branch pipe 14 respectively, then the hexagonal bulges on the through hole sleeve 4 with the hexagonal bulges in the middle can be screwed by a spanner during welding, so that the telescopic rod structure generates a vertical downward tensile force, the tensile forces generated by the telescopic rod structures on two sides are ensured to be equal under the action of the load sensor 5, the force generated by the telescopic rod structure can provide a vertical upward tensile force for the branch pipe 14 through the lever structure, and when the lever structure works, the vertical support rod 7, the fixing ring clamp 2 and the lower hinge seat of the hinge seat 8 are used as supports, and the upper hinge of the hinge seat 8 and the lever member 6 are used as force transmission components for flexible movement; at this time, the welding of the branch pipe 14 and the dry pipe 1 can be performed to form a welding line 13, and the tensile force applied when the welding process is finished and the welding is unloaded can generate a vertical downward residual compressive stress on the welding joint, so that the fatigue strength of the welding joint with the residual compressive stress on the surface can be well improved, the welding deformation can be reduced, the occurrence of welding cold cracks can be effectively reduced, the welding quality can be further improved, and the corrosion resistance of the joint can be improved.
Claims (7)
1. A device for generating residual compressive stress of welded joints of intersecting pipes, characterized in that: the four-jaw welding device comprises a main pipe and a branch pipe which are welded into a whole and are vertically arranged, wherein four fixed ring clamps are sleeved on the main pipe, the four fixed ring clamps are symmetrically arranged on two sides of the branch pipe, telescopic rod structures are vertically connected to the fixed ring clamps on two sides, vertical support rods are vertically connected to the two fixed ring clamps in the middle, four-jaw chucks are arranged on the branch pipe, lever members are connected between the four-jaw chucks and the upper ends of the telescopic rod structures on two sides, and the upper ends of the vertical support rods are connected with the corresponding lever members to form a lever structure; when the main pipe and the branch pipe are welded, the telescopic rod structure is contracted, and the lever piece is lifted upwards to pull the four-jaw chuck to generate welding tension so as to form residual compressive stress after welding;
The telescopic rod structure comprises a first vertical connecting rod, a through hole sleeve and a second vertical connecting rod, wherein the first end of the first vertical connecting rod is in threaded connection with the fixed ring clamp, the second end of the first vertical connecting rod is in threaded connection with the first end of the second vertical connecting rod through the through hole sleeve, the second end of the second vertical connecting rod is hinged with the lever, and the telescopic rod structure can be shortened or lengthened after the through hole sleeve rotates;
The second vertical connecting rod is provided with a load sensor for detecting stretching force, and the stretching force of the telescopic rod structures at two sides is ensured to be consistent through the load sensor;
the first end of the vertical support rod is in threaded connection with the fixing ring clamp, the second end of the vertical support rod is provided with a hinge seat, and the hinge seat is connected with the lever piece through a bolt.
2. An apparatus for generating residual compressive stress of a welded joint of intersecting pipes as set forth in claim 1 wherein: the two ends of the through hole sleeve are provided with internal threads, and the middle part of the through hole sleeve is provided with hexagonal protrusions for screwing and rotating.
3. An apparatus for generating residual compressive stress of a welded joint of intersecting pipes as set forth in claim 1 wherein: the hinge seat comprises an upper hinge and a lower hinge seat, and the upper hinge and the lower hinge seat are in medium clearance fit.
4. An apparatus for generating residual compressive stress of a welded joint of intersecting pipes as set forth in claim 1 wherein: the fixed ring fixture comprises two semi-ring fixtures, two ends of each semi-ring fixture are connected through hexagon bolts, and a threaded hole used for being connected with a first vertical connecting rod or a vertical supporting rod is formed in the middle of one semi-ring fixture.
5. An apparatus for generating residual compressive stress of a welded joint of intersecting pipes as claimed in claim 4, wherein: two ends of the two semi-ring clamps are respectively provided with two symmetrically distributed fixing threaded holes, and the fixing threaded holes are connected with hexagonal bolts.
6. An apparatus for generating residual compressive stress of a welded joint of intersecting pipes as set forth in claim 1 wherein: the four-jaw chuck comprises clamping teeth, inner hexagonal top wire reform bolts and two symmetrically distributed fixing points, the four-jaw chuck is in transition fit with the branch pipes through the four clamping teeth, a tooth structure is arranged at the bottom of each clamping tooth and meshed and fixed with the inner hexagonal top wire reform bolts, and the fixing points are connected with the lever part in a hinged mode.
7. An apparatus for generating residual compressive stress of a welded joint of intersecting pipes as set forth in claim 1 wherein: the main pipe is connected with the fixed ring clamp, the branch pipe is connected with the four-jaw chuck in a transition fit manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911204889.4A CN110802364B (en) | 2019-11-29 | 2019-11-29 | Device for generating residual compressive stress of welded joint of intersecting pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911204889.4A CN110802364B (en) | 2019-11-29 | 2019-11-29 | Device for generating residual compressive stress of welded joint of intersecting pipe |
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| Publication Number | Publication Date |
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| CN110802364A CN110802364A (en) | 2020-02-18 |
| CN110802364B true CN110802364B (en) | 2024-06-07 |
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| CN201911204889.4A Active CN110802364B (en) | 2019-11-29 | 2019-11-29 | Device for generating residual compressive stress of welded joint of intersecting pipe |
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| CN113182762B (en) * | 2021-03-24 | 2023-04-07 | 内蒙古工业大学 | Auxiliary welding device for vertical connecting pipe |
| CN114000849A (en) * | 2021-11-26 | 2022-02-01 | 京鸿石油钻采工程技术有限公司 | Casing head, casing head combination and wellhead assembly |
| CN115026493B (en) * | 2022-05-26 | 2023-07-21 | 华能伊敏煤电有限责任公司 | Auxiliary tool for repairing cracks of high-temperature high-pressure pipe valve for boiler |
| CN115091118B (en) * | 2022-05-30 | 2023-05-23 | 华能伊敏煤电有限责任公司 | Fixing device is restoreed to boiler reheater collection case allies oneself with pipe crackle more |
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| CN110802364A (en) | 2020-02-18 |
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