Ultrasonic phased array weld defect detection method based on oblique incidence

Abstract

The invention discloses an ultrasonic phased array weld defect detection method based on oblique incidence. An ultrasonic phased array detection system is included, and ultrasonic phased array detection steps are included, wherein the ultrasonic phased array detection system comprises a signal collecting system, a transducer probe, an organic glass wedge block, an aqueous solution connecting the organic glass wedge block with the test block surface, a coupling agent connecting the transducer probe with the organic glass wedge block and a computer used for calculating data of the signal collecting system. Accordingly, the defects can be well detected, a non-detection zone is reduced, the detection robustness and resolution are improved, the imaging quality of a far-field region can be obviously improved, and the imaging resolution and defect detection rate are increased.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to an ultrasonic phased array testing method for welding seam testing. Background technique [0002] In traditional ultrasonic weld inspection, it is generally necessary to move the transducer probe to effectively detect defects, which requires the surface roughness of the probe moving area to be ideal; at the same time, because the incident angle is too vertical, when the beam is perpendicularly incident on the surface of the test block , it can only detect defects at a certain distance from the test surface of the test block, and there is a detection blind spot. [0003] In the prior art, there are few optimizations for the signal synthesis method in synthetic aperture imaging of weld defects. The comparison document (201510219036.3) finds sampling points by interpolation weight coefficients based on scanning coordinate points, but the correlation calculation of si...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, there are few optimizations for the signal synthesis method in synthetic aperture imaging of weld defects. The comparison document (201510219036.3) finds sampling points by interpolation weight coefficients based on scanning coordinate points, but the correlation calculation of signal synthesis after signal acquisition is not no research

[0004] In addition, although the traditional synthetic aperture focusing algorithm has good versatility, there are often flaws in its specific application, for example, a large amount of calculation, general imaging effect, and low resolution

Images