CN112077525A - Thick-wall weld seam interlayer crack defect treatment process - Google Patents
Thick-wall weld seam interlayer crack defect treatment process Download PDFInfo
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- CN112077525A CN112077525A CN202010790361.6A CN202010790361A CN112077525A CN 112077525 A CN112077525 A CN 112077525A CN 202010790361 A CN202010790361 A CN 202010790361A CN 112077525 A CN112077525 A CN 112077525A
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- 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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- 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
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
Abstract
The invention provides a thick-wall welding seam interlayer crack defect treatment process, which relates to the field of pipeline welding, wherein the position of a welding seam is subjected to circular cutting according to the wall thickness of the pipeline, and part of the welding seam at the root part is reserved as stress support of the pipeline; detecting the reserved part of the welding line to obtain the reserved interlayer defects; excavating all defect positions, and detecting until all defects are removed; the welding seam part is removed, the welding seams of the two sides are reserved to be connected and supported, the thickness of the welding seams is weakened, the detection precision is improved, all tiny cracks between layers are guaranteed to be removed, the rest welding seams can fix the butt joint positions of the pipelines, the reinstallation assembly is avoided, and the butt joint precision during repair welding is guaranteed.
Description
Technical Field
The disclosure relates to the field of pipeline welding, in particular to a thick-wall welding seam interlayer crack defect treatment process.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
For the large-caliber thick-wall pipe such as the medium-pressure gas guide pipe of the 1000MW unit, when the welding is implemented, cracks easily appear between welding seam layers due to thick welding seams, so that the defects of the welding seams are caused, and the strength of the pipeline is influenced.
At present, two main schemes are provided for treating the crack defects between weld layers, wherein the scheme is that firstly, the cracks are well positioned, and the crack defect parts of the weld are removed by using mechanical modes such as an angle grinder, a carbon arc gouging and the like. And the second scheme is to use an annular groove machine to completely cut off the welding line and reinstall the butt welding.
The inventor finds that when the position of the crack defect of the welding seam is removed at present, the risk that the crack is not completely removed exists, the interlayer crack defect is easy to be omitted due to the limitation of detection means or level, particularly, the interlayer tiny crack is difficult to detect, so that the interlayer crack cannot be completely removed, the welding seam has overlarge stress due to local repair welding, and the welding seam has larger stress when the medium-pressure air duct runs, so that a new crack is easy to generate; in addition, the mode of cutting off all welding seams is adopted, cracks can be completely removed, but before the medium-pressure air guide pipe welding opening is cut off, a complex pipeline reinforcing measure needs to be taken, the precision requirement of a medium-pressure cylinder connected with the medium-pressure air guide pipe is high, the welding opening is re-installed and assembled, the medium-pressure cylinder is displaced, and a large amount of manpower and material resources are consumed when the pipeline welding opening is aligned.
Disclosure of Invention
The purpose of the disclosure is to provide a thick-wall welding seam interlayer crack defect treatment process aiming at the defects existing in the prior art, and the process can be used for removing the welding seam part, keeping part of the welding seam to connect and support pipelines on two sides, weakening the thickness of the welding seam, improving the detection precision, ensuring the complete removal of tiny cracks between layers, fixing the butt joint position of the pipelines by the residual welding seam, avoiding the reinstallation of the butt joint position and ensuring the butt joint precision during repair welding.
In order to realize the purpose, the following technical scheme is adopted:
a thick-wall weld interlayer crack defect treatment process comprises the following steps:
performing circular cutting on the position of the welding line according to the wall thickness of the pipeline, and keeping part of the welding line at the root part as stress support of the pipeline;
detecting the reserved part of the welding line to obtain the reserved interlayer defects;
and excavating all the defect positions, and detecting until all the defects are removed.
Further, circular cutting equipment is arranged at the position of a pipeline welded junction, and a weld joint is cut in the circular direction according to the wall thickness of the pipeline; the cut-out width covers the weld width.
Further, after the pipeline welding seam is subjected to annular cutting, the reserved part of the welding seam can support the pipelines on two sides to maintain the in-situ state.
And further, whether the reserved welding seam at the root has defects is detected by adopting permeation or magnetic powder, so that the defects reserved in the welding seam are all detected.
Further, the detected defect position is excavated by a straight grinding machine, and the position with the defect of the welding seam is removed.
And further, welding according to the process requirements after detecting no defect.
And further, after the defects are completely removed, repair welding is carried out according to the process, and the cut welding seams are welded according to the process requirements.
Further, positioning the welding line of the pipeline according to the trend of the pipeline, and respectively acquiring the thickness of the pipeline and the thickness of the welding line; as reference data for the circular cut.
Compared with the prior art, the utility model has the advantages and positive effects that:
(1) the welding seam is partially removed, and part of the welding seam is reserved for connecting and supporting the pipelines on two sides, so that the thickness of the welding seam is weakened, the detection precision is improved, the complete removal of interlayer micro cracks is ensured, the rest welding seam can fix the butt joint position of the pipelines, the reinstallation assembly is avoided, and the butt joint precision during repair welding is ensured;
(2) after circumferential cutting, part of welding seams are reserved, the thickness of the welding seams is small, the crack defects among the layers can be detected in detail by adopting the existing detection means, the problem that the crack defects in the thick welding seams corresponding to the thick-wall pipelines cannot be detected is avoided, all the tiny cracks among the layers are detected, the thorough removal is ensured, and the problem that new cracks are generated due to overlarge welding seam stress caused by local repair welding is avoided;
(3) compared with the traditional mode of completely removing the welding seams at the crack positions, the reserved welding seams realize the fixation of the pipeline positions, so that the pipeline is always in the initial position, the displacement generated by the reinstallation and pairing of the craters is avoided, and the manpower and material resources consumed by the reinstallation and pairing of the craters are solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 is a schematic illustration of the pipe weld locations in example 1 of the present disclosure;
fig. 2 is a schematic structural diagram of a weld ring in embodiment 1 of the present disclosure after the weld ring is cut.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this disclosure, if any, merely indicate that the directions of movement are consistent with those of the figures themselves, and are not limiting in structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present disclosure.
As introduced in the background art, in the prior art, when the position of the weld crack defect is removed, the risk that the crack is not completely removed exists, and due to the limitation of detection means or level, the interlayer crack defect is easy to be missed, and particularly, the interlayer micro crack is difficult to detect, so that the crack cannot be completely removed; the mode of cutting off all welding seams is adopted, cracks can be completely removed, but the middle pressure cylinder can be displaced due to the fact that welding seams are installed again and assembled, and a large amount of manpower and material resources are needed when the pipeline welding seams are aligned; in order to solve the problems, the disclosure provides a thick-wall weld interlayer crack defect treatment process.
Example 1
In an exemplary embodiment of the present disclosure, a thick-walled weld interlaminar crack defect treatment process is presented, as shown in fig. 1-2.
The problem of processing multiple crack defects between welding seam layers of a medium-pressure gas guide tube of a 1000MW unit is mainly solved, and the crack defects are easy to occur between the layers when the pipeline is subjected to multilayer welding due to the thick wall of the medium-pressure gas guide tube;
moreover, because the pipe wall is thick, the welding seam generated during welding is also thick, so that when the traditional detection mode is adopted, the defects in the welding seam are difficult to detect due to the influence of the thick wall, and the problem of incomplete defect removal is caused;
the weld is not thoroughly removed, the local repair welding can cause overlarge weld stress, the stress of the weld is larger when the medium-pressure gas guide pipe runs, and new cracks are easily generated.
The defect treatment process comprises the following steps:
positioning the pipeline welding line according to the pipeline trend, and respectively acquiring the pipeline thickness and the welding line thickness;
performing circular cutting on the position of the welding line according to the wall thickness of the pipeline, and keeping part of the welding line at the root part as stress support of the pipeline; when the position of the welding line of the pipeline is cut, the welding line is cut to the residual part at the root part, so that the pipeline can be effectively supported;
detecting the reserved part of the welding line to obtain the reserved interlayer defects;
and excavating all the defect positions, and detecting until all the defects are removed.
Specifically, the defect processing procedure in this embodiment is described in detail with reference to fig. 1 to fig. 2:
firstly, erecting an annular beveling machine at a welded junction of the medium-pressure gas-guide tube, cutting off the residual 5-10mm from the welded joint to the root by using the annular beveling machine according to the wall thickness of the pipeline, wherein the welded joint reserved at the root can be used as a stressed support of the pipeline.
And secondly, detecting whether the reserved welding seam of the root has defects by using permeation or magnetic powder, wherein the detection method is simple to operate, and can detect the defects reserved in the remaining welding seam of the root and ensure that all interlayer defects are detected.
Thirdly, welding can be carried out according to the process requirement after detecting no defect; and if the defects still exist, using a straight grinding machine to dig out the defects, detecting again until the defects are completely removed, and then performing repair welding according to the process.
The welding line is not cut off by using an annular beveling machine, the root is reserved as a stress support, and the welding line of the root is detected by using permeation or magnetic powder, so that the interlayer cracks are completely removed, and a good application effect is obtained after the process is implemented.
It can be understood that through the defect treatment process, the defect of cracks between welding seams of the medium-pressure gas-guide tube can be completely removed, the problem of overlarge local stress caused by local welding is avoided, and the use safety of the repaired welded junction is ensured; construction resource waste caused by pipeline reinforcement and installation assembly can be greatly reduced; the waste of human resources in the construction process can be reduced, and the repair efficiency of the welding seam is improved.
Further, for the circular cutting equipment arranged at the position of the pipeline welded junction, cutting the welded seam along the circular direction according to the wall thickness of the pipeline; cutting off the width of the covered weld joint; after the pipeline welding seam is cut off in an annular mode, a part of welding seam is reserved, and the pipeline on two sides can be supported by the welding seam to maintain the in-situ state;
the circular cutting equipment can be selected according to requirements, in the embodiment, an annular beveling machine can be selected and used for cutting and removing the welding line along the annular shape; in other embodiments, other circular cutting devices may be used, such as a grinder, a grinder with a circular track, or the like, which can grind the weld location as desired.
The thickness of the welding seam of the reserved part at the root of the welding seam is not specially limited, and the residual part of the welding seam after cutting needs to meet the requirements of maintaining the connection relation of the pipeline sections corresponding to the welding seam, maintaining the stress support of the pipeline sections and ensuring the relative position of the pipeline sections to be unchanged; in addition, the requirement that the detection equipment can accurately detect the residual welding seam part is required to be met, and the whole detection of the welding seam crack defect is ensured;
in the embodiment, the thickness of the root of the residual welding line is 5mm-10mm, so that the requirements of pipeline stress support and pipeline relative position fixation are met.
After the circumferential weld is cut off, part of the weld is reserved, the thickness of the weld is small, the crack defect between layers can be detected in detail by adopting the existing detection means, the problem that the crack defect in the thick weld corresponding to the thick-wall pipeline cannot be detected is avoided, all the tiny cracks between layers are detected, the thorough removal is ensured, and the problem that new cracks are generated due to overlarge weld stress caused by local repair welding is avoided.
Further, detecting whether the reserved welding seam at the root has defects by adopting permeation or magnetic powder, and ensuring that all the defects reserved in the welding seam are detected; excavating the detected defect position through a straight grinding machine, and removing the position with the defect of the welding seam;
after the defect position on the welding line is obtained, the defect is removed in an excavation mode, only the structure of the defect position of the welding line is removed, and the influence on other positions of the welding line is reduced, so that the stress requirement for maintaining stress support of the pipeline can be met by the residual welding line, the problems of uneven stress and unstable support caused by large-area loss of the welding line near the crack defect are avoided, and the positioning precision of the pipeline is further ensured.
Further, when the distance between the excavated defect positions is short, repair welding is carried out on the excavated defect positions, and then the nearby defect positions are excavated;
through carrying out repair welding to the defect position after excavating, maintain its support intensity near the position, avoid excavating the stress concentration problem that leads to on a large scale, improved the stability at repair welding in-process pipeline butt joint position.
Compared with the traditional mode of completely removing the welding seams at the crack positions, the reserved welding seams realize the fixation of the pipeline positions, so that the pipeline is always in the initial position, the displacement generated by the reinstallation and pairing of the craters is avoided, and the manpower and material resources consumed by the reinstallation and pairing of the craters are solved.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. The thick-wall weld interlayer crack defect treatment process is characterized by comprising the following steps of:
performing circular cutting on the position of the welding line according to the wall thickness of the pipeline, and keeping part of the welding line at the root part as stress support of the pipeline;
detecting the reserved part of the welding line to obtain the reserved interlayer defects;
and excavating all the defect positions, and detecting until all the defects are removed.
2. A thick-wall weld interlayer crack defect treatment process as claimed in claim 1, wherein a girth cutting device is arranged at the position of a pipeline welding port, and the welding line is cut along the circumferential direction according to the wall thickness of the pipeline; the cut-out width covers the weld width.
3. The wall thickness weld interlaminar crack defect treatment process of claim 2, wherein after the annular cutting of the pipeline weld, a part of the weld is reserved to support the pipelines on both sides to maintain the in-situ state.
4. A thick-wall weld interlayer crack defect treatment process as claimed in claim 1, wherein penetration or magnetic powder is adopted to detect whether defects exist in the root reserved weld, and the defects reserved in the weld are all detected.
5. A thick-walled weld interlaminar crack defect treatment process as claimed in claim 1, wherein the detected defect position is excavated by a straight mill to remove the position of the weld with defects.
6. A thick-walled weld interlaminar crack defect treatment process as claimed in claim 1, wherein after detecting no defects, welding is performed according to process requirements.
7. A thick-wall weld interlayer crack defect treatment process as claimed in claim 6, wherein after the defects are all removed, repair welding is carried out according to the process, and the cut weld is welded according to the process requirements.
8. A thick-walled weld interlaminar crack defect treatment process as claimed in claim 1, wherein the pipe weld is positioned according to the pipe orientation to obtain the pipe thickness and the weld thickness respectively.
9. A thick-walled weld interlaminar crack defect treatment process as claimed in claim 8, wherein when cutting is performed on the pipe weld location, the weld is cut off to leave 5mm to 10mm of the root.
10. A thick-walled weld interlaminar crack defect treatment process as claimed in claim 1, wherein when the distance between the excavated defect position is short, repair welding is carried out on the excavated defect position, and then the nearby defect position is excavated.
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Cited By (1)
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| CN114734201A (en) * | 2022-05-06 | 2022-07-12 | 中煤哈密发电有限公司 | Comprehensive treatment method for cracks of header tube seat on boiler side water-cooling wall |
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