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Weld Defect Detection Using High Frequency SH Guided Wave Transducers Based on Magnetostrictive Mechanism

机译:基于磁致伸缩机制的高频SH导波传感器焊接缺陷检测

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In view of the low sensitivity to defects of low-frequency shear horizontal (SH) guided wave transducers, a high frequency SH-guided-wave transducer is designed. The guided wave modes that could be excited in high frequency are analyzed based on frequency bandwidth and spatial period. Based on the pitch-catch transducers, an experiment platform is set up and weld defects are detected. The waveforms in time domain are analyzed according to the velocity of each guided wave mode and the relative position between transducers and the weld. Finally, the weld is scanned using the designed SH-guided-wave transducers, and the image of the weld is obtained. The result shows that the transducers can effectively detect the actual defects in weld.
机译:鉴于对低频剪切水平(SH)引导波换能器的低缺陷的敏感性,设计了高频SH引导波换能器。基于频率带宽和空间时段,分析了在高频上振奋的引导波模式。基于间距传感器,建立实验平台,并检测焊接缺陷。根据每个引导波模式的速度和换能器和焊接之间的相对位置分析时域中的波形。最后,使用所设计的SH导波换能器扫描焊接,并获得焊缝的图像。结果表明,换能器可以有效地检测焊缝中的实际缺陷。

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