کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
294945 | 511504 | 2016 | 6 صفحه PDF | دانلود رایگان |
• Point-focusing EMATs were developed for inspection of stress-corrosion cracking.
• The 2 MHz EMAT was suitable for inspection of stainless steels.
• Stress-corrosion cracking near the weld metal was clearly detected.
• Crack detectability of the PF-EMAT was comparable to that of the phased-array sensor.
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.
Journal: NDT & E International - Volume 83, October 2016, Pages 88–93