CN112008192A - Pipeline girth weld repairing method based on additive technology - Google Patents
Pipeline girth weld repairing method based on additive technology Download PDFInfo
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- CN112008192A CN112008192A CN202010760984.9A CN202010760984A CN112008192A CN 112008192 A CN112008192 A CN 112008192A CN 202010760984 A CN202010760984 A CN 202010760984A CN 112008192 A CN112008192 A CN 112008192A
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- pipeline
- repaired
- girth weld
- weld
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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
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
- B23K26/28—Seam welding of curved planar seams
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
- B23K26/348—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding in combination with arc heating, e.g. tungsten inert gas [TIG], metal inert gas [MIG] or plasma welding
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a pipeline girth weld repairing method based on an additive technology, which comprises the following steps of; firstly, machining a circumferential weld of a pipeline to be repaired to expose a metal body at the circumferential weld; melting the welding wire into liquid metal along the circumferential direction of the pipeline to be repaired, then melting the liquid metal to the surface of the pipeline to be repaired at the circumferential weld joint, and forming a reinforcing pipeline at the circumferential weld joint; the diameter and the thickness of the pipe wall of the reinforced pipeline are larger than those of the pipeline to be repaired, and the length of the reinforced pipeline is larger than the width of the circumferential weld. The axial tensile deformation bearing capacity of the pipeline can be effectively improved, and therefore the service safety of the pipeline is effectively guaranteed when geological disasters occur.
Description
Technical Field
The invention belongs to the field of pipeline repair, and relates to a pipeline girth weld repair method based on an additive technology.
Background
The repair of the circumferential weld of the pipeline is currently performed in a common mode of A-type sleeve repair, B-type sleeve repair and epoxy steel sleeve repair. The A-shaped sleeve is formed by welding two semicircular columnar plates covered on the defective part of the pipeline through a side seam. The structure of the B-shaped sleeve is the same as that of the A-shaped sleeve, and the B-shaped sleeve is formed by positioning two arc-shaped plates with proper radian, but the end part of the B-shaped sleeve is connected with a pipeline in a fillet welding mode. The epoxy steel sleeve is formed by wrapping the defective part of the pipe body by two steel sleeves, sealing the end part of the steel sleeve by sealant, and injecting epoxy resin into an annular gap formed between the sleeve and the wall of the pipeline.
In the three repairing technologies, the A-type sleeve and the epoxy steel sleeve only have annular bonding force, so that larger axial load cannot be resisted. The B-shaped sleeve can help the pipeline to resist partial axial load due to the fillet weld at the end part, but the area for connecting the fillet weld and the pipeline is limited, the strength of the fillet weld per se cannot be higher than that of the section of the pipe body, the safe operation of the pipeline under the plastic deformation condition cannot be ensured, and once the axial deformation caused by geological disasters such as stratum movement occurs, the risk of failure can be met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a pipeline girth weld repairing method based on an additive technology, which can effectively improve the axial tensile deformation bearing capacity of a pipeline, thereby effectively ensuring the service safety of the pipeline when a geological disaster occurs.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a pipeline girth weld repairing method based on an additive technology comprises the following steps;
firstly, machining a circumferential weld of a pipeline to be repaired to expose a metal body at the circumferential weld;
melting the welding wire into liquid metal along the circumferential direction of the pipeline to be repaired, then melting the liquid metal to the surface of the pipeline to be repaired at the circumferential weld joint, and forming a reinforcing pipeline at the circumferential weld joint; the diameter and the thickness of the pipe wall of the reinforced pipeline are larger than those of the pipeline to be repaired, and the length of the reinforced pipeline is larger than the width of the circumferential weld.
Preferably, in the step one, the metal body at the circumferential weld of the pipeline is exposed in a turning and polishing mode.
Preferably, in the first step, adjacent pipelines on two sides of the girth weld are used as repair sections, the length of each repair section is equal to the length of each reinforcing pipeline, the metal body of each repair section is exposed in a machining mode, the length of each repair section is greater than or equal to 5T + W, T is the wall thickness of the pipeline to be repaired, and W is the width of the girth weld.
Preferably, in the second step, before welding, the ring weld is ground until the metal body is exposed.
Preferably, in the second step, a welding arc, a laser or a laser-welding arc is used as a heat source and pure argon gas is used as a shielding gas in the deposition.
Preferably, in the second step, the length L of the reinforcing pipeline is more than or equal to 3T + W, wherein T is the wall thickness of the pipeline to be repaired, and W is the width of the circumferential weld.
Preferably, in the second step, the outer walls at the two axial ends of the reinforcing pipeline gradually approach the outer wall of the pipeline to be repaired to form a transition section.
Further, the length S of the transition section is S which is larger than or equal to T, wherein T is the wall thickness of the pipeline to be repaired.
Preferably, in the second step, the yield strength of the welding wire after deposition is not lower than the yield strength of the material of the pipeline to be repaired.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the circumferential weld is repaired by using an additive manufacturing technology, so that a reinforcing pipeline similar to a sleeve is added outside the pipeline to be repaired, the inner surface of the reinforcing pipeline and the outer surface of the pipeline to be repaired are completely combined into a whole, the combination area of the bearing structure of the repaired part and the surface of the pipeline to be repaired is increased, and the structural strength near the circumferential weld is higher than that of the pipeline to be repaired. Therefore, when the pipeline to be repaired is deformed axially, the deformation is not concentrated in the area near the circumferential weld, the crack driving force of the circumferential defect of the inner surface is effectively reduced, the defect cannot crack under the condition of plastic deformation, the repaired pipeline has axial connection strength and deformation capacity far exceeding the existing pipeline repairing technology, the circumferential weld can be prevented from being deformed concentratedly, and the defect growth is prevented.
Furthermore, the reinforcing pipeline and the pipeline to be repaired are transited through a transition section, and local strain concentration is avoided.
Drawings
FIG. 1 is a cross-sectional view of a circumferential weld being repaired in accordance with the present invention.
Wherein: 1-a pipeline to be repaired; 2-reinforcing the pipeline; 3-girth welding; 4-girth weld defect.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the invention discloses a pipeline girth weld repairing method based on an additive technology, which comprises the following steps of:
step (1), determining a circumferential weld 3 to be repaired of the pipeline 1 to be repaired, and performing excavation operation on the buried pipeline 1 to be repaired to expose the pipeline 1 to be repaired and ensure enough operation space.
And (2) removing the circumferential weld 3 of the pipeline 1 to be repaired and the coating of the nearby pipe body by mechanical means including turning and polishing to expose the metal surface.
Adjacent pipelines on two sides of the girth weld joint 3 are used as repairing sections, the length of each repairing section is equal to the length of the reinforcing pipeline 2, a metal body of each repairing section is exposed by machining, the length of each repairing section is greater than or equal to 5T + W, T is the wall thickness of the pipeline 1 to be repaired, and W is the width of the girth weld joint 3.
When the pipe turning device is used for turning, the circular rail is nested on the pipe 1 to be repaired, the turning tool is arranged on the rail and can move on the rail, and the pipe 1 to be repaired is turned around the peripheral surface of the pipe 1 to be repaired.
Step (3), local additive manufacturing is carried out on the position near the circumferential weld 3 by using an additive manufacturing technology, and a new pipe body is generated;
step (3.1), an additive repair mode: and (3) polishing the girth weld 3 until the metal body is exposed, taking the polished girth weld 3 and the repair section as a base body, adopting welding arc, laser or laser-welding arc as a heat source, taking pure argon as protective gas, melting the welding wire into liquid metal from the top to the bottom of the pipeline to be repaired, namely from the 12 o 'clock position to the 6 o' clock position along the circumferential direction, then cladding the liquid metal on the surface of the base body, and covering the girth weld defect 4 to form the reinforcement pipeline 2.
And (3.2) calculating the thickness of the reinforced pipeline 2 manufactured by the additive manufacturing of the repaired part according to the geometric specification of the pipeline 1 to be repaired as shown in figure 1. The thickness of the reinforcing pipeline 2 is not less than the wall thickness of the pipeline 1 to be repaired, the length L of the main body of the reinforcing pipeline is not less than 3T + W, T is the wall thickness of the pipeline 1 to be repaired, and W is the width of the circumferential weld 3. The outer walls of the two axial ends of the reinforcing pipeline 2 are gradually closed to the outer wall of the pipeline 1 to be repaired to form a transition section, and the length S of the transition parts on the two sides is larger than or equal to T.
In the cross-sectional view shown in fig. 1, the part of the reinforcing pipeline 2 on one side of the pipeline 1 to be repaired is an isosceles trapezoid, and the inclined part of the isosceles trapezoid is a transition section.
And (3.3) the yield strength of the welding wire after deposition is not lower than the yield strength of the material of the pipeline to be repaired 1, so that the yield strength of the reinforced pipeline 2 is not lower than the yield strength of the pipeline to be repaired 1.
The method effectively solves the problems of insufficient connection area of the annular force bearing part and limited bearing capacity of the prior art, so that the reinforced pipeline 2 which is in strong matching is obtained on the circumferential weld 3, the circumferential weld 3 and the circumferential weld defect 4 are effectively shielded, the circumferential weld 3 with certain defects is strained, the pipeline structure which can bear higher axial plastic deformation is finally obtained, and the most easily-occurred pipeline circumferential weld 3 failure under the geological disaster condition is avoided.
In addition, the invention can also be used for reinforcing the pipeline with the low-strength circumferential weld 3, so that the low-strength circumferential weld 3 has higher structural strength, and the pipeline has higher strain capacity when bearing external load and deforming, thereby having certain resistance to damage of environments such as geological disasters and the like.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. A pipeline girth weld repairing method based on an additive technology is characterized by comprising the following steps;
firstly, machining a circumferential weld (3) of a pipeline (1) to be repaired to expose metal bodies of pipelines on two sides of the circumferential weld (3);
melting welding wires into liquid metal along the circumferential direction of the pipeline (1) to be repaired, then depositing the liquid metal on the surface of the pipeline (1) to be repaired at the circumferential weld joint (3), and forming a reinforcing pipeline (2) at the circumferential weld joint (3); the diameter and the pipe wall thickness of the reinforcing pipeline (2) are larger than those of the pipeline (1) to be repaired, and the length of the reinforcing pipeline (2) is larger than the width of the circumferential weld (3).
2. The pipe girth weld repairing method based on the additive technology according to claim 1, wherein in the first step, the metal body at the girth weld (3) of the pipe (1) is exposed by turning and grinding.
3. The pipeline girth weld repairing method based on the additive technology according to claim 1, wherein in the first step, adjacent pipelines on two sides of the girth weld (3) are used as repairing sections, the length of each repairing section is equal to the length of the reinforced pipeline (2), a metal body of each repairing section is exposed in a machining mode, and the length of each repairing section is greater than or equal to 5T + W, wherein T is the wall thickness of the pipeline (1) to be repaired, and W is the width of the girth weld (3).
4. The pipeline girth weld repairing method based on the additive technology according to claim 1, wherein in the second step, before cladding, the girth weld (3) on the end face of the pipeline (1) to be repaired is ground until the metal body of the girth weld (3) on the end face of the pipeline (1) to be repaired is exposed.
5. The additive-technology-based pipeline girth weld repair method according to claim 1, wherein in the second step, during deposition, a welding arc, a laser or a laser-welding arc is used as a heat source, and pure argon is used as a shielding gas.
6. The pipeline girth weld repairing method based on the additive technology according to claim 1, wherein in the second step, the length L of the reinforcing pipeline (2) is L which is more than or equal to 3T + W, wherein T is the wall thickness of the pipeline (1) to be repaired, and W is the width of the girth weld (3).
7. The pipeline girth weld repairing method based on the additive technology according to claim 1, wherein in the second step, outer walls of two axial ends of the reinforcing pipeline (2) gradually approach to the outer wall of the pipeline (1) to be repaired to form a transition section.
8. The pipeline girth weld repair method based on the additive technology according to claim 7, wherein the length S of the transition section is S ≧ T, where T is the wall thickness of the pipeline (1) to be repaired.
9. The pipe girth weld repairing method based on the additive technology as claimed in claim 1, wherein in the second step, the yield strength of the welding wire after being deposited is not lower than the yield strength of the material of the pipe (1) to be repaired.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010760984.9A CN112008192A (en) | 2020-07-31 | 2020-07-31 | Pipeline girth weld repairing method based on additive technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010760984.9A CN112008192A (en) | 2020-07-31 | 2020-07-31 | Pipeline girth weld repairing method based on additive technology |
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| CN112008192A true CN112008192A (en) | 2020-12-01 |
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| CN202010760984.9A Pending CN112008192A (en) | 2020-07-31 | 2020-07-31 | Pipeline girth weld repairing method based on additive technology |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112395800A (en) * | 2020-12-08 | 2021-02-23 | 中国石油天然气集团有限公司 | Method for calculating thickness of B-type sleeve for repairing circumferential weld crack defects of oil and gas pipeline |
| CN116921988A (en) * | 2022-03-31 | 2023-10-24 | 中国石油天然气集团有限公司 | Defect-containing pipeline strain capacity improving method based on additive manufacturing technology |
| CN119665063A (en) * | 2023-09-21 | 2025-03-21 | 中国石油天然气集团有限公司 | A method for repairing defects in girth welds of urban gas metal pipelines |
| CN119858002A (en) * | 2023-10-20 | 2025-04-22 | 中国石油天然气集团有限公司 | Laser repairing method and system for oil-gas separator regulating valve |
| CN120885995A (en) * | 2025-09-30 | 2025-11-04 | 中国石油集团工程材料研究院有限公司 | A method for repairing cracks on the inner surface of a pipe circumferential weld. |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112395800A (en) * | 2020-12-08 | 2021-02-23 | 中国石油天然气集团有限公司 | Method for calculating thickness of B-type sleeve for repairing circumferential weld crack defects of oil and gas pipeline |
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| CN116921988A (en) * | 2022-03-31 | 2023-10-24 | 中国石油天然气集团有限公司 | Defect-containing pipeline strain capacity improving method based on additive manufacturing technology |
| CN119665063A (en) * | 2023-09-21 | 2025-03-21 | 中国石油天然气集团有限公司 | A method for repairing defects in girth welds of urban gas metal pipelines |
| CN119858002A (en) * | 2023-10-20 | 2025-04-22 | 中国石油天然气集团有限公司 | Laser repairing method and system for oil-gas separator regulating valve |
| CN120885995A (en) * | 2025-09-30 | 2025-11-04 | 中国石油集团工程材料研究院有限公司 | A method for repairing cracks on the inner surface of a pipe circumferential weld. |
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