Simulation Study on Weld Defect Detection Based on Lamb Waves
The ultrasonic Lamb wave method was employed for weld inspection,and a numerical simulation study was conducted on it.In the process of numerical simulation,the influence of variations in weld cross-sectional shape on the propagation of ultrasonic Lamb waves was investigated.To further enhance the detection accuracy of welds,the WT time-frequency analysis method was adopted,which effectively identified defects where the weld reinforcement exceeded the actu-al measurement range by 2%,achieving the identification of target signals under clutter interference.The narrow frequency band and absence of interfering frequencies enhanced the clarity of the detection signals.
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