Submarine pipeline weld defect AUT detection quantification method and system

Abstract

The invention discloses a submarine pipeline weld defect AUT detection quantification method, and the method comprises the following steps: an image acquisition step of acquiring an ultrasonic detection display image; an image adjustment step of adjusting a fan-shaped display scaling ratio; a step of determining the central position of the weld defect: moving a circumferential position pointer andan angle pointer to enable the angle pointer to be located at the central position of a central color block of the weld defect; a step of acquiring central position information of a central color block of the weld defect, namely moving the reference pointer to the central position of the central color block of the weld defect to acquire the central position information of the central color blockof the weld defect; and a welding seam defect depth information calculation step: obtaining the depth information of the welding seam defect according to the central position depth information of thecentral color block of the welding seam defect. According to the method, based on the display characteristics of AUT detection, the defect size is accurately quantified by utilizing the color change of the defect image in fan-shaped display, so the accuracy of high quantification of the weld defect is improved.

Description

technical field [0001] The invention belongs to the technical field of submarine pipeline AUT detection, and in particular relates to an AUT detection and quantitative method and system for weld seam defects of submarine pipelines. Background technique [0002] With the continuous acceleration of the development of modern industry, deep-sea oil and gas development has become an inevitable trend, and the importance of offshore oil pipelines transporting deep-sea oil and gas has also been highlighted. Therefore, the welding quality of offshore oil pipeline girth welds has become the focus of people's increasing attention. . [0003] At the same time, with the extensive use of Engineering Critical Assessment (ECA) acceptance criteria, the quality assessment of submarine pipeline girth welds has changed from the initial simple defect length measurement to the combined assessment of the height and length of defects. In this way, the accuracy of automatic ultrasonic testing (Auto...

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Problems solved by technology

[0004] However, the height evaluation error of the conventional fan-shaped display image is relatively large, resulting in a high failure rate of the weld seam, which affects the normal laying efficiency of submarine pipelines and greatly limits its application in submarine pipelines. In the application process of AUT detection in submarine pipelines, How to improve the accuracy of defect height quantification is particularly important

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