CN110153634B - Pipeline girth weld re-welding repair method - Google Patents
Pipeline girth weld re-welding repair method Download PDFInfo
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- CN110153634B CN110153634B CN201910414413.7A CN201910414413A CN110153634B CN 110153634 B CN110153634 B CN 110153634B CN 201910414413 A CN201910414413 A CN 201910414413A CN 110153634 B CN110153634 B CN 110153634B
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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
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
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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
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/042—Built-up welding on planar surfaces
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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
- B23K9/32—Accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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Abstract
The invention relates to a method for re-welding and repairing a pipeline girth weld, which solves the problems of high welding work intensity and incapability of ensuring welding quality in the repair of defects at the conventional girth weld, and comprises the following steps: 1) cleaning and cleaning the circumferential weld of the pipeline and adjacent areas; 2) nondestructive inspection of the circumferential weld and adjacent areas of the pipeline; 3) arranging a strain gauge near the pipeline girth weld; 4) carrying out re-welding repair treatment on the pipeline circumferential weld, and monitoring the stress strain in the process; 5) performing nondestructive inspection on the re-welding repair welding bead of the pipeline circumferential weld processed in the step 4); 6) judging whether the re-welding of the pipeline circumferential weld is qualified or not, if so, executing the step 7), and if not, returning to the step 4); 7) carrying out anti-corrosion treatment on the re-welding repair welding bead which is judged to be qualified; 8) and carrying out backfill recovery treatment on the pipeline subjected to the anti-corrosion treatment.
Description
Technical Field
The invention relates to the field of oil and gas conveying pipelines, in particular to a method for re-welding and repairing a pipeline girth weld, which can be used for the emergency maintenance operation of an oil and gas conveying in-service pipeline.
Background
The pipeline transportation is an efficient, convenient and environment-friendly mode for oil and gas transportation, the mileage of the existing long-distance pipeline used in China is about 8 thousands of kilometers, and great convenience is brought to modern life. The pipeline belongs to a special pressure container, and in the operation process of the oil and gas long-distance pipeline, defects in the pipeline can be caused due to corrosion, stress and the like, so that the operation safety of the pipeline is reduced. Therefore, the pipe is inspected during use to detect defects in the pipe, such as metal loss due to corrosion (reduced wall thickness), lack of fusion at the pipe girth weld joint, etc., and repair the pipe.
At present, two main ways are available for repairing the defects at the circumferential weld: and (5) replacing the pipe or repairing the B-shaped sleeve in a reinforcing way. Pipe replacement is a main means for thoroughly eliminating hidden troubles of pipelines, but pipeline outage is required to be carried out, and production of downstream oil and gas users is affected. As shown in fig. 1, the welding seams after the pipeline is repaired by the B-shaped sleeve comprise two lateral longitudinal welding seams and two end fillet welding seams, the welding is manual operation, the working strength is high, the welding difficulty of the two circumferential fillet welding seams is high, and the welding quality is not easy to guarantee.
Disclosure of Invention
The invention aims to solve the problems of high welding work intensity and incapability of ensuring welding quality in the existing repair of the defects at the circumferential weld joint, and provides a method for re-welding and repairing the circumferential weld joint of the pipeline.
The technical scheme of the invention is as follows:
a re-welding repair method for a pipeline girth weld comprises the following steps:
1) cleaning and cleaning the circumferential weld of the pipeline and adjacent areas;
2) carrying out nondestructive inspection on the circumferential weld and adjacent areas of the pipeline;
3) arranging a strain gauge near the pipeline girth weld for monitoring the stress strain near the pipeline girth weld;
4) carrying out re-welding repair treatment on the circumferential weld of the pipeline to form a re-welding repair weld bead and simultaneously monitoring stress strain;
the re-welding repair treatment of the pipeline circumferential weld specifically comprises the following steps:
4.1) preheating a part to be welded and repaired of the pipeline circumferential weld;
4.2) performing back welding on the to-be-welded and repaired part of the pipeline circumferential weld to form a back welding layer;
4.3) cleaning and checking the welding seam after the backing welding in the step 4.2), if the welding seam is qualified, executing the step 4.4), and if the welding seam is not qualified, removing the unqualified backing welding layer, and returning to the step 4.2);
4.4) carrying out transition layer welding on the welding line processed in the step 4.3);
4.5) cleaning and checking the welding seam welded by the transition layer in the step 4.4), if the welding seam is qualified, executing the step 4.6), and if the welding seam is not qualified, removing the unqualified transition layer, and returning to the step 4.4);
4.6) carrying out filling layer welding on the welding line treated in the step 4.5);
4.7) cleaning and checking the welding seam welded by the filling layer in the step 4.6), if the welding seam is qualified, executing the step 4.8), and if the welding seam is not qualified, removing the unqualified filling layer, and returning to the step 4.6);
4.8) performing surface layer welding on the welding line processed in the step 4.7);
4.9) cleaning and checking the welding seam welded on the cover surface layer in the step 4.8), if the welding seam is qualified, executing the step 5), and if the welding seam is unqualified, removing the unqualified cover surface layer, and returning to the step 4.8);
5) carrying out nondestructive inspection on the re-welding repair welding bead in the step 4);
6) judging whether the re-welding of the pipeline circumferential weld is qualified or not according to the non-destructive inspection result of the re-welding repair weld bead in the step 5) and the stress strain monitored in the step 4), executing the step 7 if the re-welding is qualified, and returning to the step 4 if the re-welding is not qualified);
7) carrying out anti-corrosion treatment on the re-welding repair welding bead which is judged to be qualified;
8) and carrying out backfill recovery treatment on the pipeline subjected to the anti-corrosion treatment.
Further, a step of arranging a separation layer is further included between the step 4.1) and the step 4.2):
and arranging a separation layer at the part to be welded and repaired of the pipeline girth weld, wherein a gap is formed between the separation layer and the pipeline girth weld.
Further, in the step 3), arranging a strain gauge near the pipeline girth weld specifically as follows: strain patterns are attached to two sides of the welding line at the positions of the pipelines 3 ', 6', 9 'and 12', and strain patterns are alternately attached to one side of the welding line at the positions of the pipelines 1 ', 2', 4 ', 5', 7 ', 8', 10 'and 11'.
Further, a step of reducing the pressure is further included between the step 3) and the step 4):
carrying out depressurization operation on the pipeline;
the step 6) and the step 7) also comprise a step of boosting (once reducing the pressure before repairing) operation:
and recovering the normal operating pressure of the depressurized pipeline.
Further, in the step 4), the width of the bottom welding layer is 3-5 times of the width of the outer welding bead of the circular welding seam of the original pipeline, the width of the transition layer is 3-5 times of the width of the outer welding bead of the circular welding seam of the original pipeline, the width of the filling layer is 2-5 times of the width of the outer welding bead of the circular welding seam of the original pipeline, and the width of the cover surface layer is 2-4 times of the width of the outer welding bead of the circular welding seam of the original pipeline.
Further, in the step 4.1), preheating the to-be-rewelded and repaired part of the pipeline girth weld is to preheat in an induction heating belt mode.
Further, in the step 4.1), the temperature for preheating the parts to be re-welded and repaired of the pipeline girth welds is 80-150 ℃.
Compared with the prior art, the invention has the following technical effects:
1. the invention provides a re-welding (surfacing) repair method for a circumferential weld, which is equivalent to reducing the length of a B-shaped sleeve to 0, replacing two circumferential fillet welds during reinforcing and repairing the B-shaped sleeve into a re-welding (surfacing) weld for an original circumferential weld, and completing the re-welding (surfacing) repair weld for the original circumferential weld by adopting an automatic welding mode of a machine, thereby reducing the manual operation intensity and ensuring the welding quality.
2. The invention repairs the hidden trouble of lack quality in the in-service pipeline circumferential weld in a re-welding (overlaying) mode and provides guarantee for the subsequent safe operation of pipelines.
3. The invention provides an organization structure and a geometric dimension of a re-welding (surfacing) welding bead for repairing a circumferential weld of an in-service pipeline, and provides reliable guarantee for the re-welding weld.
Drawings
FIG. 1 is a schematic view of a conventional B-sleeve in conjunction with a pipeline being repaired;
FIG. 2 is a schematic view of a direct surfacing welding method for repairing a circumferential weld of a pipeline according to the present invention;
FIG. 3 is a schematic view of a separation layer provided in the method for repairing a circumferential weld of a pipe by re-welding according to the present invention;
FIG. 4 is a schematic diagram of the appearance of the pipeline girth weld after direct overlaying in the re-welding repair method of the invention;
FIG. 5 is a schematic view of the welding profile of the pipeline girth weld after the separation layer is arranged in the method for repairing the pipeline girth weld by re-welding.
Reference numerals: 1-a pipeline circumferential weld, 2-a bottom welding layer, 3-a transition layer, 4-a filling layer, 5-a cover surface layer, 6-a separation layer and 7-a pipeline.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Based on the progress of the current 3D printing (surfacing welding) technology and by utilizing automatic welding equipment, the invention provides a repair scheme for problematic circumferential welds, which comprises the following steps: the method adopts a mode of directly overlaying and widening the original welding seam to improve the strength and rigidity of the circumferential welding seam, or adopts a mode of overlaying (3D printing) to construct a 'B-shaped sleeve' with shorter length for bridging the original circumferential welding seam (not fused with the original welding seam), so as to improve the strength and rigidity of the original circumferential welding seam. The invention omits the fillet weld of a B-shaped sleeve mode and is easy to realize mechanical automatic operation.
The circumferential weld re-welding (surfacing) repair method provided by the invention is equivalent to reducing the length of the B-shaped sleeve to 0, and meanwhile, two circumferential angle welds during reinforcing and repairing of the B-shaped sleeve are replaced by one circumferential re-welding (surfacing) weld, and the circumferential re-welding (surfacing) repair weld can be completed by adopting a machine automatic welding mode, so that the manual operation intensity is reduced, and the welding quality is ensured. The re-welding (overlaying) repair of the ring weld is to thicken (the increased thickness is about the wall thickness of an original pipeline) and widen (the heat affected zone of an original ring weld bead is completely covered and possibly wider) the original ring weld on the basis of the original ring weld, so that when the re-welding (overlaying) of the ring weld is repaired, the re-welding (overlaying) has small influence on the structure performance of the original ring weld bead, the re-welding (overlaying) forms a new weld bead, and the new weld bead performance index and the quality guarantee are the key for influencing the re-welding (overlaying) repair quality of the ring weld.
Why does not increase the height and width of the "reinforced high" portion of the annular bead during one-pass welding of the pipe? When the pipeline is actually constructed, the design of the circumferential weld is matched with the design of the equal strength, and the circumferential weld does not need to be reinforced by a high part, so that the strength of the circumferential weld is the same as that of the pipeline steel pipe body. Under the condition of ensuring the quality of the normal girth weld, the height and the width of the 'reinforced high' part of the girth weld are increased, so that the method not only increases the consumption of welding materials, reduces the construction efficiency and increases the construction cost of the girth weld, but also can not effectively reinforce the girth weld. However, if the unqualified defect appears in the circumferential weld when the facility is built in the actual pipeline, but the unqualified defect appearing in the circumferential weld can be repaired by re-welding (overlaying) reinforcement through evaluation, so that the 'reinforcement height' is specially designed and welded for the circumferential weld, and the 'reinforcement height' of the circumferential weld plays an effective reinforcing role in the circumferential weld with the original quality problem. In addition, with the progress of welding technology in recent years, higher mechanical property (strength, toughness and plasticity) indexes of the re-welding (surfacing) repair circumferential weld can be obtained, so that the more severe bearing of the circumferential weld repair re-welding (surfacing) weld bead becomes possible.
When facilities are built in an actual pipeline, if unqualified defects appear in a girth weld, the defects of the girth weld of the pipeline are evaluated, the feasibility of the girth weld of the in-service pipeline after re-welding (surfacing) repair is determined, then a scheme for re-welding (surfacing) repair of the girth weld of the in-service pipeline is formulated, and the re-welding (surfacing) repair of the girth weld of the in-service pipeline is implemented according to the formulated scheme for re-welding (surfacing) repair of the girth weld of the in-service pipeline.
Example one
The invention provides a re-welding (surfacing) repair method for an in-service pipeline circumferential weld, which comprises the following steps of:
1) cleaning and cleaning the pipeline girth weld 1 and adjacent areas;
2) carrying out nondestructive inspection on the pipeline circumferential weld 1 and adjacent areas to confirm that the pipeline circumferential weld 1 is suitable for being repaired by re-welding (overlaying);
3) arranging a strain gauge near the pipeline girth weld 1 so as to monitor the stress strain of a subsequent link, wherein the steps are as follows: strain patterns are respectively pasted on two sides of the welding line at the positions of the pipelines 3 ', 6', 9 'and 12', strain patterns are respectively pasted on the alternate single sides of the welding lines at the positions of the pipelines 1 ', 2', 4 ', 5', 7 ', 8', 10 'and 11', and the pasting positions of the strain patterns are as close to the original ring welding line as possible under the condition of not influencing the welding;
4) if necessary, the pipeline 7 is subjected to pressure reduction operation before pipeline girth welding repair (for example, the pressure of the natural gas pipeline 7 is reduced to be lower than 80% of the highest pressure of the pipeline in 1 year when the defect is found, and the pressure of the natural gas pipeline is reduced to be lower than 80% of the highest pressure of the pipeline in 6 months when the defect is found);
5) implementing re-welding (surfacing) repair of the in-service pipeline circumferential weld to form a re-welding repair weld bead, and immediately monitoring the stress strain in the process;
6) carrying out nondestructive inspection on the re-welding repair welding bead of the pipeline circumferential welding seam 1;
7) judging whether the re-welding of the pipeline girth weld 1 is qualified or not according to the non-destructive inspection result of the re-welding repair weld and the actually monitored stress strain, executing the step 8 if the re-welding is qualified, and returning to the step 5 if the re-welding is not qualified);
8) if necessary, the pipeline 7 is subjected to boosting operation, and the normal operation pressure of the pipeline 7 subjected to pressure reduction is recovered;
9) checking and accepting the pipeline girth weld 1 which is judged to be qualified for repair and the repair weld bead, and performing anti-corrosion treatment on the pipeline girth weld 1 which is checked and accepted and is welded (built-up) at the repair position;
10) and backfilling and recovering the pipeline part qualified in the anti-corrosion treatment (the pipeline is usually a buried pipeline 7, is excavated and exposed in the maintenance process, and needs to be backfilled and buried after the maintenance is finished).
Step 5) implementing the re-welding (surfacing) repair of the in-service pipeline circumferential weld, specifically comprising the following steps
5.1) preheating a part to be re-welded (overlaying) repaired of the circumferential weld by adopting an induction heating belt or other modes, and heating to a certain proper temperature (generally 80-150 ℃) according to design;
5.2) backing welding the preheated part to form a backing welding layer 2; backing welding adopts welding materials which are easy to weld with the original welding line; for example, for X70/L485 steel grade pipelines, E5015-G welding materials or other similar welding materials are adopted for backing welding; the width of backing weld can be 3-5 times of the width of the outer weld bead of the original girth weld;
5.3) cleaning and checking the welding bead after backing welding, if the welding bead is qualified, executing the step 5.4), if the welding bead is unqualified, removing the unqualified backing welding layer, and returning to the step 5.2);
5.4) welding the welding seam processed in the step 5.3) with a transition layer 3, wherein the transition layer 3 is made of welding materials with good plasticity and toughness; for example, for X70/L485 steel grade pipelines, transition welding adopts E5015-G welding materials or other similar welding materials; the width of the transition welding can be 3-5 times as wide as the width of the outer welding bead of the original girth welding seam, and the transition welding width is gradually narrowed compared with the width of the backing welding;
5.5) cleaning and checking a welding bead after welding of the transition layer 3, if the welding bead is qualified, executing the step 5.6), and if the welding bead is unqualified, removing the unqualified transition layer, and returning to the step 5.4);
5.6) welding the welding line treated in the step 5.5) with a filling layer 4, wherein the filling layer 4 is made of welding materials with good plasticity and toughness and high strength; for example, for X70/L485 steel grade pipelines, E5015-G welding materials or other similar welding materials are adopted for filling welding; the filling welding width can be 2-5 times as wide as the width of the outer welding bead of the original girth welding seam, and is gradually narrowed compared with the backing welding;
5.7) cleaning and checking a welding bead after welding of the filling layer 4, if the welding bead is qualified, executing the step 5.8), and if the welding bead is unqualified, removing the unqualified filling layer, and returning to the step 5.6);
5.8) welding the welding line processed in the step 5.7) with a cover surface layer 5, wherein the cover surface layer 5 is made of welding materials with better plasticity and toughness. For example, for an X70/L485 steel grade pipeline, E5015-G welding materials or other similar welding materials are adopted for cover surface welding; the cover surface welding width can be 2-4 times as wide as the width of the outer welding bead of the original girth welding seam, and is gradually narrowed compared with the backing welding;
5.9) cleaning and checking the welding bead after welding the cover surface layer 5, if the welding bead is qualified, executing the step 6), and if the welding bead is unqualified, removing the unqualified cover surface layer, and returning to the step 5.8).
As shown in FIGS. 2 and 4, the bottom welding layer 2 welding, the transition layer 3 welding, the filling layer 4 welding and the cover surface layer 5 welding adopted by the invention can be designed in a thinning way according to specific steel pipe materials, so that the surfacing structure has comprehensive toughness and plasticity, and the repair and reinforcement of the original circumferential weld are really exerted.
Carry out two
The second embodiment is similar to the first embodiment, and the differences are as follows: and a step of arranging a separation layer is also included between the step 4.1) and the step 4.2), and a welding separation layer 6 is installed on the part to be welded and repaired of the circumferential weld. As shown in fig. 3 and 5, the spacer layer 6 is used as a base mold layer, and a short "B-shaped sleeve" is formed on the spacer layer 6 by 3D printing (build-up welding) so that the formed B-shaped sleeve bridges both sides of the original girth weld. When a short-sized 'B-shaped sleeve' is formed by adopting a 3D printing (surfacing) structure, the separation layer 6 does not melt the original circumferential weld, so that a certain gap exists between the inner wall of the 'B-shaped sleeve' subjected to 3D printing (surfacing) and the original circumferential weld.
When the separation layer 6 is installed and welded, the separation layer 6 is made of a material with low strength and high plasticity and toughness, the thickness of the material is 1-2mm, and the width of the material is 20-25 mm. The thickness of the material of the separation layer 6 is 1-2mm, so that the separation layer 6 cannot be welded through during surfacing to affect the original circumferential weld, a certain gap exists between a structure (B-shaped sleeve) of subsequent surfacing and the original circumferential weld, and a surfacing forming base die can be provided for subsequent surfacing; an advantage of a width of 20-25mm is to allow the structure ("B-sleeve") of the subsequent weld overlay to span the girth weld (including the heat affected zone of the girth weld).
Claims (3)
1. The method for re-welding and repairing the circumferential weld of the pipeline is characterized by comprising the following steps of:
1) cleaning and cleaning the circumferential weld of the pipeline and adjacent areas;
2) carrying out nondestructive inspection on the circumferential weld and adjacent areas of the pipeline;
3) arranging a strain gauge near the pipeline girth weld for monitoring the stress strain near the pipeline girth weld;
4) carrying out re-welding repair treatment on the circumferential weld of the pipeline to form a re-welding repair weld bead and simultaneously monitoring stress strain;
the re-welding repair treatment of the pipeline circumferential weld specifically comprises the following steps:
4.1) preheating a part to be welded and repaired of the pipeline circumferential weld;
4.2) performing back welding on the to-be-welded and repaired part of the pipeline circumferential weld to form a back welding layer;
4.3) cleaning and checking the welding seam after the backing welding in the step 4.2), if the welding seam is qualified, executing the step 4.4), and if the welding seam is not qualified, removing the unqualified backing welding layer, and returning to the step 4.2);
4.4) carrying out transition layer welding on the welding line processed in the step 4.3);
4.5) cleaning and checking the welding seam welded by the transition layer in the step 4.4), if the welding seam is qualified, executing the step 4.6), and if the welding seam is not qualified, removing the unqualified transition layer, and returning to the step 4.4);
4.6) carrying out filling layer welding on the welding line treated in the step 4.5);
4.7) cleaning and checking the welding seam welded by the filling layer in the step 4.6), if the welding seam is qualified, executing the step 4.8), and if the welding seam is not qualified, removing the unqualified filling layer, and returning to the step 4.6);
4.8) performing surface layer welding on the welding line processed in the step 4.7);
4.9) cleaning and checking the welding seam welded on the cover surface layer in the step 4.8), if the welding seam is qualified, executing the step 5), and if the welding seam is unqualified, removing the unqualified cover surface layer, and returning to the step 4.8);
5) carrying out nondestructive inspection on the re-welding repair welding bead in the step 4);
6) judging whether the re-welding of the pipeline circumferential weld is qualified or not according to the non-destructive inspection result of the re-welding repair weld bead in the step 5) and the stress strain monitored in the step 4), executing the step 7 if the re-welding is qualified, and returning to the step 4 if the re-welding is not qualified);
7) carrying out anti-corrosion treatment on the re-welding repair welding bead which is judged to be qualified;
8) carrying out backfill recovery treatment on the pipeline subjected to the anti-corrosion treatment;
a step of arranging a separation layer is also included between the step 4.1) and the step 4.2):
arranging a separation layer at a position to be welded and repaired of the pipeline girth weld, wherein a gap is formed between the separation layer and the pipeline girth weld;
a step of reducing pressure is also included between the step 3) and the step 4):
carrying out depressurization operation on the pipeline;
a step of boosting operation is further included between the step 6) and the step 7):
recovering normal operating pressure of the depressurized pipeline;
in the step 3), arranging strain gauges near the pipeline circumferential weld specifically as follows: pasting strain patterns on two sides of the welding line at the positions of the pipelines 3 ', 6', 9 'and 12', and alternately pasting strain patterns on one side of the welding line at the positions of the pipelines 1 ', 2', 4 ', 5', 7 ', 8', 10 'and 11';
in the step 4), the width of the bottom welding layer is 3-5 times of the width of the outer welding bead of the original pipeline girth weld, the width of the transition layer is 3-5 times of the width of the outer welding bead of the original pipeline girth weld, the width of the filling layer is 2-5 times of the width of the outer welding bead of the original pipeline girth weld, and the width of the cover layer is 2-4 times of the width of the outer welding bead of the original girth weld.
2. The method for re-welding and repairing the pipeline girth weld according to claim 1, wherein in the step 4.1), the part to be re-welded and repaired of the pipeline girth weld is preheated by adopting an induction heating belt.
3. The method of rehabilitating a pipe girth weld according to claim 2, wherein: in the step 4.1), the temperature for preheating the parts to be welded and repaired of the pipeline girth welds is 80-150 ℃.
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| JPS58377A (en) * | 1981-06-24 | 1983-01-05 | Kawasaki Steel Corp | Deep penetration arc welding method for thick walled steel materials by multiple electrodes |
| JP2005279664A (en) * | 2004-03-29 | 2005-10-13 | Nippon Steel Corp | Method for joining mash seam joined tube of titanium-made or titanium alloy-made tube |
| CN101579774B (en) * | 2008-05-15 | 2011-06-22 | 中国石油天然气股份有限公司 | On-line repairing-reinforcing structure for oil pipelines |
| CN201310708Y (en) * | 2008-08-13 | 2009-09-16 | 中国石油天然气股份有限公司 | Pipeline spiral weld defect repairing structure |
| CN106141561B (en) * | 2016-07-20 | 2019-01-08 | 浙江翰德圣智能再制造技术有限公司 | A kind of renovation technique of multistage pump pump shaft |
| CN106990112B (en) * | 2017-03-14 | 2019-07-26 | 清华大学 | Multi-layer multi-pass welding track detection device and method based on multi-visual information fusion |
| CN108127257B (en) * | 2017-12-21 | 2019-11-12 | 中广核工程有限公司 | In-service nuclear power station main equipment safe end weld defect restorative procedure |
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Effective date of registration: 20221215 Address after: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: China Petroleum Engineering Materials Research Institute Co.,Ltd. Patentee after: BEIJING LONGSHINE OIL TUBULAR TECHNOLOGY Co.,Ltd. Patentee after: Xi'an Sanhuan Petroleum Pipe Technology Co.,Ltd. Address before: 710065, No. two, No. 32, Xi'an, Shaanxi Patentee before: CNPC TUBULAR GOODS Research Institute Patentee before: Xi'an Sanhuan Petroleum Pipe Technology Co.,Ltd. |
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