From Event: SPIE Commercial + Scientific Sensing and Imaging, 2018
This paper deals with the use of eddy current thermography for spot weld nugget diameter assessment. As a nondestructive testing method, eddy current thermography is successfully used to give an estimation of the nugget diameter of resistance spot weld. A ferrite-yoke based inductive coil is used to thermally heat-up spot welds while monitoring the opposite face of the heated face using infrared camera with 40µm/pixel spatial resolution. The inductive coil and the camera are placed at different side of the sample. The heat wave travels from one side to the other through areas with different thermal properties. The recorded thermal response is processed using Fourier transformation which allows identifying non-destructively the nugget and the heat affected zone. The nugget diameter is estimated in pixel and the camera resolution is used to retrieve the value in millimeters. The results, compared with destructive micrographic cut as a reference, are in good agreement.
A. Taram, C. Roquelet, Ph. Meilland, G. Le Noc, J. L. Bodnar, Th. Duvaut, C. Kaczynski, and Th. Dupuy, "Assessment of nugget diameter of resistance spot welds using pulse eddy current thermography," Proc. SPIE 10661, Thermosense: Thermal Infrared Applications XL, 1066110 (Presented at SPIE Commercial + Scientific Sensing and Imaging: April 18, 2018; Published: 14 May 2018); https://doi.org/10.1117/12.2305080.
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