| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 294945 | NDT & E International | 2016 | 6 Pages |
•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.
