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Method for checking electric arc burn defect in pipeline welding process

A technology for arc burns and welding processes, applied in the direction of optical testing flaws/defects, preparation of test samples, etc., can solve the problem of undetectable burn non-crack defects (tissue change, inability to completely remove burn defects, affecting project progress and Quality and other issues to achieve the effect of avoiding waste, avoiding the consumption of manpower and material resources, and ensuring progress and quality

Active Publication Date: 2012-05-23
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the traditional "conventional radiographic flaw detection" only detects and judges crack defects, and cannot detect non-crack defects (tissue changes, etc.) caused by burns, and cannot completely remove burn defects
This means that the conventional acceptance method is costly and inefficient, which seriously affects the progress and quality of the project

Method used

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  • Method for checking electric arc burn defect in pipeline welding process
  • Method for checking electric arc burn defect in pipeline welding process
  • Method for checking electric arc burn defect in pipeline welding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] During the welding construction of a pipeline, there was no less than one arc burn defect.

[0019] 1) Find the most serious defect of arc burn: first use the vernier caliper to find the most serious burn defect in appearance size.

[0020] 2) Surface cleaning: Use an electric grinder to remove the protrusions on the surface of the area that are higher than the base material.

[0021] 3) Grinding and polishing: Use 120# and 360# metallographic sandpaper to roughly grind the burned area; then use 600# and 800# metallographic sandpaper to finely grind the burnt area. Among them, after replacing the fine sandpaper, the grinding direction should be 90° from the previous direction until the previous grinding marks are worn off. The above process needs to keep a certain flow of water as the cooling liquid continuously to prevent the steel pipe surface from being affected by heat and cause structural changes; after the finely ground steel pipe parts are rinsed with water, use...

Embodiment 2

[0026] During the welding construction of a pipeline, there was no less than one arc burn defect.

[0027] 1) Find the most serious defect of arc burn: first use the vernier caliper to find the most serious burn defect in appearance size.

[0028] 2) Surface cleaning: Use an electric grinder to remove the protrusions on the surface of the area that are higher than the base material.

[0029] 3) Grinding and polishing: Use 120# and 360# metallographic sandpaper to roughly grind the burned area; then use 600# and 800# metallographic sandpaper to finely grind the burnt area. Among them, after replacing the fine sandpaper, the grinding direction should be 90° from the previous direction until the previous grinding marks are worn off. The above process needs to keep a certain flow of water as the cooling liquid continuously to prevent the steel pipe surface from being affected by heat and cause structural changes; after the finely ground steel pipe parts are rinsed with water, use...

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Abstract

The invention relates to a method for checking electric arc burn defect in a pipeline welding process. The method comprises the steps of: for the condition of generating at least one electric arc burn defect, removing a bulge, higher than a base metal, on the surface of a defect burn area with a most serious electric arc burn; coarsely grinding, fine grinding, polishing and corroding the burn area; observing, analyzing and measuring thickness and checking, measuring the minimum residual wall thickness tresidual without remarkable burn characteristics after a steel pipe is ground and polished by using an ultrasonic wall thickness apparatus, comparing with the minimum allowance wall thickness tmix of the steel pipe, judging whether the bulge is cut off or re-welded; enabling the pipe section with the most serious burn defect not be to cut off and residual defects to be checked and accepted, grinding the residual burn defect and removing characteristic textures without remarkable burn; and if the bulge needs to be cut off and re-welded, re-executing the steps 1-8 for the residual defects of the pipeline, and checking the residual burn defect. The method is economic and efficient, andhas strong site operability, and ensures progress and quality of building the pipeline.

Description

technical field [0001] The invention relates to an inspection and acceptance of arc burn defects in the pipeline welding process, and is especially suitable for on-site inspection and acceptance of arc burn defects in the pipeline welding process. Background technique [0002] At present, my country's oil and gas pipeline construction business is in the ascendant. Key pipelines such as the west section of the Second West-East Gas Pipeline Project, the Central Asia Pipeline Project, and the Sichuan-East Gas Pipeline Project have just been completed and put into operation; while the eastern section of the Second West-East Gas Pipeline Project is under intense construction; in addition, the China-Myanmar Pipeline and the Third West-East Gas Pipeline The oil and gas strategic channels such as the fourth line and the fourth line are already under planning. According to the national plan, by 2020, my country's oil and gas transmission pipelines will basically form an oil and gas ...

Claims

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Application Information

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IPC IPC(8): G01N21/88G01N1/32
Inventor 仝珂李金凤朱丽霞何小东瞿婷婷韩新利
Owner BC P INC CHINA NAT PETROLEUM CORP
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