Method and device for detecting circumferential weld micro-defects of high attenuation material pipe

By employing ultrasonic guided wave mode pairs that do not meet group velocity matching and PVDF comb-shaped flexible piezoelectric sensors in the circumferential welds of high-attenuation material pipes, combined with wavelet packet denoising and FFT filtering, the accuracy and efficiency issues of micro-defect detection in the circumferential welds of high-attenuation material pipes were solved, achieving high-precision micro-defect detection and location.

CN117074526BActive Publication Date: 2026-06-12XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAMEN UNIV
Filing Date
2023-08-10
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing non-destructive testing technologies cannot effectively detect stress concentrations and micro-cracks in the circumferential welds of pipes made of high-attenuation materials. Conventional ultrasonic testing methods have low detection efficiency and cannot meet the requirements for high precision.

⚗Method used

By employing ultrasonic nonlinear static component theory, ultrasonic guided wave mode pairs that do not meet the group velocity matching condition are selected. Combined with a PVDF comb-shaped flexible piezoelectric sensor, the ultrasonic characteristic guided wave signals are processed by wavelet packet denoising and FFT filtering to achieve micro-defect detection of circumferential welds in high-attenuation material pipelines.

🎯Benefits of technology

It achieves high-precision and high-efficiency non-destructive testing of micro-defects, accurately locates stress concentration and micro-damage in welds, overcomes the limitation of ultrasonic wave propagation distance by high-attenuation materials, and improves the signal-to-noise ratio and testing efficiency of the test results.

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Abstract

The application discloses a kind of high attenuation material pipeline circumferential weld microdefect detection method and device, adopt PVDF comb flexible piezoelectric sensor, to meet the universality of the geometric shape of pipeline circumferential weld.Its detection method includes: through the geometric shape and material attribute of the pipeline circumferential weld to be detected, based on semi-analytical finite element method, the dispersion curve is calculated;Based on the nonlinear static component theory, the ultrasonic mode pair of group velocity mismatch is selected.Processing and FFT filtering processing are carried out to the ultrasonic detection receiving signal based on wavelet change noise reduction, and the stress concentration phenomenon, microdamage degree and position in the high attenuation material pipeline circumferential weld are judged based on FFT filtering processing result.The application adopts the above scheme, realizes the nondestructive testing of stress concentration phenomenon and microdamage of high attenuation material pipeline circumferential weld, solves the problem that existing circumferential weld microdamage nondestructive testing method cannot meet the efficient detection of the sample to be detected and the high-precision microdefect positioning requirement.
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