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Magnetic Nondestructive Test for Resistance Spot Welds Using Magnetic Flux Penetration and Eddy Current Methods

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Abstract

Resistance spot welding technologies are widely used in industry. A highly reliable monitoring method is needed to effectively weld and create a robust structure. We developed a combined technique using magnetic flux penetration and an eddy current test (ECT). The magnetic measuring system consists of a pair of magnetic probes having an induction coil and detection coil, a lock-in amplifier, a current source, and a personal computer. The magnetic flux penetration through both surfaces at the weld was measured at low frequency. The ECT was performed at each surface with multiple frequencies. The magnetic flux penetration method showed good correlation with the destructive shear test because of the change in permeability due to the formation of the nugget. The ECT method reflected the depth profile of the nugget and was effective for determining a defective product.

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Authors and Affiliations

  1. Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kitaku, Okayama, 700-8530, Japan

    Keiji Tsukada, Kousuke Miyake, Daichi Harada, Kenji Sakai & Toshihiko Kiwa

Authors
  1. Keiji Tsukada
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  2. Kousuke Miyake
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  3. Daichi Harada
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  4. Kenji Sakai
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  5. Toshihiko Kiwa
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Correspondence to Keiji Tsukada.

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Tsukada, K., Miyake, K., Harada, D. et al. Magnetic Nondestructive Test for Resistance Spot Welds Using Magnetic Flux Penetration and Eddy Current Methods. J Nondestruct Eval 32, 286–293 (2013). https://doi.org/10.1007/s10921-013-0181-0

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  • DOI: https://doi.org/10.1007/s10921-013-0181-0

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