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Authors:
Keisyu Shiga
Song Nannan
Kenji Sakai
Toshihiko Kiwa
Keiji Tsukada
Keywords: eddy current testing (ECT); non-destructive testing; spot-welds; skin depth
Abstract:
Spot-welding is widely used to assemble parts, such as those of vehicle bodies. To control the quality, safety and productivity of industrial products, a quick and accurate method of inspecting spot-weld is required. In our previous research, we reported an analysis method of examining the strength of spot welded parts by eddy current test (ETC) using a wide range of frequencies from high to low. In this paper, we report a method of analyzing the internal structure of a spot-weld. Magnetic field change showed a good correlation with the destructive shear test to check joint strength. The depth profile of the welded part was obtained by changing the skin depth using a wide range of frequencies. As the magnetic field strength at each frequency was not constant, they were normalized to create the depth profile. The two-dimensional depth profile was obtained by line scanning, and the three-dimensional depth profile was obtained by surface scanning. The three-dimensional internal structure of the welded part, which is nugget-shaped, was constructed from the volume rendering of the three-dimensional map, and it correlated with the shape obtained by cross-sectional observation.
Pages: 170 to 173
Copyright: Copyright (c) IARIA, 2015
Publication date: August 23, 2015
Published in: conference
ISSN: 2308-3514
ISBN: 978-1-61208-426-8
Location: Venice, Italy
Dates: from August 23, 2015 to August 28, 2015