Inspection of stress corrosion cracking in welded stainless steel pipe using point-focusing electromagnetic-acoustic transducer
Inspection of stress corrosion cracking in welded stainless steel pipe using point-focusing electromagnetic-acoustic transducer
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DOI：
10.1016/j.ndteint.2016.06.005
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发表时间：
2016-10-01
影响因子：
4.2
通讯作者：
Hirao, Masahiko
中科院分区：
文献类型：
--
作者：
Nakamura, Nobutomo;Ashida, Kazuhiro;Hirao, Masahiko
针对不锈钢管道裂纹检测问题，研制了剪切-垂直波（SV波）点聚焦电磁声换能器（PF-EMAT）。该换能器通过在同相焦点处累积由同心线源产生的SV波来提高缺陷检测能力。发现用于缺陷检测的最佳频率为2 MHz，利用该频率可以清楚地检测到焊缝附近0.5mm深的裂纹。EMAT的缺陷检测能力与传统的相控阵压电换能器相当，这表明这种新的EMAT是非常实用的非接触评价不锈钢应力腐蚀裂纹。(C)2016爱思唯尔有限公司版权所有。
Point-focusing electromagnetic-acoustic transducers (PF-EMATs) for shear-vertical (SV) waves were developed for crack inspection of stainless-steel pipes. The transducer has improved defect detectability by accumulating SV waves generated by concentric line sources at a focal point in phase. An optimum frequency for defect detection was found to be 2 MHz, with which a crack of 0.5 mm depth near a weld was clearly detected. The EMAT exhibited defect detectability comparable to that of a conventional phased-array piezoelectric transducer, indicating that this new EMAT is highly practical for the non contacting evaluation of stress-corrosion cracking in stainless steels. (C) 2016 Elsevier Ltd. All rights reserved.