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.
Eddy current thermography [1][2][3][4][5] consists in using electromagnetic induction to create heat flow in the material and record its thermal response using an infrared camera. Defect detection is based on the changes of the thermal distribution. It is an efficient and precise method for detecting subsurface defect in metallic materials and can be deployed either in the form of pulses or amplitude modulations [3,4]. This paper describes simulation works using Pulsed Eddy Current Thermography for defect detection and quantification in material made of steel in transmission mode. Flux2D Finite Element Software is used.
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