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Magnetic Flux Leakage Testing of Reverse Side Wall-Thinning by Using Very Low Strength Magnetization

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Abstract

This study focused on the very low-field region of the initial magnetization curve and developed a method to inspect and evaluate reverse side wall-thinning on a ferromagnetic test object by using very low strength magnetized magnetic flux leakage testing. The principle of the method was derived based on the magnetic circuit theory, and a parameter named as differential magnetic-leaking reluctivity was found to be a linear function of the remaining thickness of a ferromagnetic steel plate with thinning on the reverse side. This approach was verified by electromagnetic numerical simulation, and highly sensitive magneto-impedance sensor utilized measurements. Preliminary measurements demonstrated that it is possible to measure and estimate the thicknesses of ferromagnetic plates using very low-level magnetized magnetic flux leakage testing, suggesting the applicability of using this approach to inspect and evaluate over a sufficiently large area reverse side thinning.

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Authors and Affiliations

  1. NDE Center, Japan Power Engineering and Inspection Corporation, 14-1 Benten-cho, Tsurumi, Yokohama, 230-0044, Japan

    Weiying Cheng

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  1. Weiying Cheng
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Correspondence to Weiying Cheng.

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Cheng, W. Magnetic Flux Leakage Testing of Reverse Side Wall-Thinning by Using Very Low Strength Magnetization. J Nondestruct Eval 35, 31 (2016). https://doi.org/10.1007/s10921-016-0347-7

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  • DOI: https://doi.org/10.1007/s10921-016-0347-7

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