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Narrow gap automatic welding seam repair method and system

A repair method and repair system technology are applied in the field of narrow gap automatic welding seam repair and systems, which can solve the problems that the grooves required for repair welding cannot be machined, secondary defects cannot be accurately removed, etc., and are conducive to repairing. Quality, accurate removal, and the effect of reducing construction costs

Active Publication Date: 2018-03-23
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, manual excavation and manual welding repair are mostly used for repairing such welding defects. This method has defects such as inability to accurately remove defects, machining of grooves required for repair welding, and easy occurrence of secondary defects.

Method used

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  • Narrow gap automatic welding seam repair method and system
  • Narrow gap automatic welding seam repair method and system
  • Narrow gap automatic welding seam repair method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] refer to Image 6 , the embodiment of the present invention provides a narrow gap automatic welding seam repair method for large pipelines, the steps are:

[0062] S1. Locate the defects of the pipeline welds, and use the positioning points set before welding on the pipelines to mark the weld defects on the pipeline entity;

[0063] Positioning point: After the weld seam is welded, the surface of the weld seam needs to be polished to be as smooth as the base metal. Most of these weld seams need to be inspected in service. Before welding, make a small pit on the pipe as the positioning point. After recording the distance between the positioning point and the weld seam, after the weld seam is polished, the specific position of the weld seam can be accurately found by the distance from the positioning point;

[0064] S2. Based on the result of defect location, excavate the pipeline defect and the heat-affected zone of the original weld;

[0065] S3. After the pipeline de...

Embodiment 2

[0092] Based on the same inventive concept, an embodiment of the present invention also provides a narrow-gap automatic weld seam repair system for large pipelines. The repair system includes:

[0093] The welding seam positioning module is used to locate the defect of the narrow gap automatic welding seam, and use the positioning point set on the pipeline before welding to mark the welding seam defect on the pipeline entity;

[0094] Weld defect excavation module is used to excavate pipeline defects and original weld heat-affected zone based on the result of defect location;

[0095] The weld groove processing module is used to process the weld groove of the pipeline after the pipeline defect is excavated;

[0096] The welding seam repairing module is used for repairing welding seams of pipes after the groove processing is completed.

[0097] In the specific implementation process, the defect removal module uses groove processing equipment to remove pipeline defects and orig...

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Abstract

The invention discloses a narrow-gap automatic welding joint repairing method and system for large-diameter pipes to eliminate weld defects precisely, enable groove machining and guarantee repair welding quality. The method comprises the steps of S1, conducting defect location on a pipe weld joint, and marking a weld joint defect on the pipe body by means of a positioning point arranged on the pipe before welding; S2, excavating the pipe defect and an original weld heat-affected zone out based on the defect positioning result; S3, conducting pipe weld joint groove machining after the defect is excavated out; S4, conducting repair welding on the pipe weld joint after groove machining is finished. The method and system are suitable for narrow-gap automatic welding joint defect repairing of large thick-wall pipes, such as main pipes and surge pipes, in a nuclear power plant.

Description

technical field [0001] The invention relates to a method for repairing weld seam defects formed by automatic welding of narrow gaps on large pipelines in the engineering fields of nuclear power, hydropower, and thermal power, and a system using the method. Background technique [0002] At present, large-scale pipelines in nuclear power, hydropower, thermal power and other engineering fields often use new welding technologies for narrow gap automatic welding, such as main pipelines, wave pipes, and nuclear-grade large thick-walled pipelines in nuclear power plants. Due to the inherent particularity of the narrow-gap automatic welding technology, if the parameter selection is unreasonable or improperly controlled during welding, it is very easy to produce unfused welding defects along the automatic welding track at the groove, such as figure 1 As shown in the figure, 1 is the center of the welding circle, 2 is the tungsten electrode, 3 is the wire feeding tube, 4 is the track ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P6/00
CPCB23P6/00
Inventor 李辉张家龙
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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