Weld defect detection using PPM EMAT generated shear horizontal ultrasound
Weld defect detection using PPM EMAT generated shear horizontal ultrasound
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DOI：
10.1016/j.ndteint.2015.05.005
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发表时间：
2015-09-01
影响因子：
4.2
通讯作者：
Dixon, S.
中科院分区：
文献类型：
--
作者：
Petcher, P. A.;Dixon, S.
奥氏体焊缝采用PPM电磁超声产生的剪切水平波（SH）进行检测。将结果与使用全聚焦法（TFM）使用1D压电相控阵进行的测量进行比较。第一次有明确的实验证据表明，SH波方法表现出更高的灵敏度，缺陷检测。SH波在焊缝中比压缩波或SV波遭受更少的波束转向，由于焊缝微观结构的各向异性和衰减，压缩波或SV波可以错过缺陷。使用SH波从焊缝/板的每一侧识别所有缺陷，但使用压电换能器是不可能的。(C)2015作者爱思唯尔有限公司出版
Austenitic welds are inspected using PPM EMAT generated shear horizontal (SH) waves. Results are compared to measurements taken using a 1D piezoelectric phased array using the total focusing method (TFM). For the first time there is clear experimental evidence of the SH wave method demonstrating higher sensitivity to defect detection. SH waves suffer less beam steering in a weld than either compression or SV waves, which can miss defects due to weld microstructure anisotropy and attenuation. All defects were identified from every side of the weld/plate using the SH waves, but this was not possible using the piezoelectric transducer. (C) 2015 The Authors. Published by Elsevier Ltd.