The paper presents the use of eddy current thermography for detecting cracks in resistance spot welds. The sample is a three-sheet stack-up joined together by welding spots. Inductive Helmholtz coil is used for heating up the sample, and the thermal response of each spot is monitored using a cooled indium antimonide camera. The sequence of images captured is processed using the pulsed-phase thermography technique. The phase image is completed with a supplementary filtering operation to allow outlining defects. The result was confirmed with confocal microscopy inspection.
© 2018 Optical Society of AmericaFull Article | PDF Article
More Like This
Appl. Opt. 55(34) D17-D21 (2016)
Hai Zhang, Stefano Sfarra, Ahmad Osman, Fabrizio Sarasini, Udo Netzelmann, Stefano Perilli, Clemente Ibarra-Castanedo, and Xavier P. V. Maldague
Appl. Opt. 57(18) D74-D81 (2018)
Marc Genest and Gang Li
Appl. Opt. 57(18) D40-D48 (2018)