Defect depth detection system and method based on circumferential guided waves

Abstract

The invention discloses a pipeline defect depth judgment method based on a circumferential guided wave technology, and belongs to the field of nondestructive testing signal analysis. The method comprises the following steps: detecting a healthy pipeline through an ultrasonic guided wave nondestructive detection system, and taking a detection signal as a reference signal; detecting a series of pipelines with different defect depths by using the system again, and respectively obtaining detection signals under different defect depths; the amplitude A1 of the reference signal and the amplitude A2 of the detection signal under different defect depths are extracted, and the difference value A0 = A2-A1 is calculated; calculating to obtain change values of detection signal amplitudes under different defect depths, and drawing a change curve of a signal amplitude difference value along with the defect depths; and finding a point corresponding to the amplitude difference value of the detection signal in the curve graph, so that a corresponding defect depth value can be found. Determination of the defect depth of the pipeline is realized, and the service life of the pipeline can be deduced according to the numerical value.

Description

technical field [0001] The invention relates to the field of non-destructive testing technology and pipeline structure health testing, in particular to a defect depth detection system and method based on a circumferential waveguide. Background technique [0002] With the development of society, the total mileage of my country's pipelines is increasing, and the demand for non-destructive testing of pipeline corrosion is also increasing. At present, the pipes in service in my country mainly include seamless pipes, straight seam pipes and spiral welded pipes. During the use of pipes, they will be affected by factors such as corrosion and external force damage, resulting in defects. [0003] At present, the non-destructive testing methods for pipelines mainly include radiographic testing, ultrasonic testing, eddy current testing, magnetic particle testing and penetrant testing. Radiographic inspection judges defects based on the intensity of radiation passing through the inspec...

AI Technical Summary

Problems solved by technology

Penetrant testing has high sensitivity, intuitive display, convenient operation, and low testing cost, but it can only detect defects with surface openings and their surface distribution, and it is difficult to make quantitative evaluation of defects

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