Nonuniform magnetization of an article around a flaw during magnetic inspection

ISSN： 1061-8309

Source： Russian Journal of Nondestructive Testing, Vol.43, Iss.5, 2007-05, pp. : 310-315

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Abstract

Measurements of the induction in a ferromagnetic article directly around a surface flaw in the form of a rectangular slot have shown that there is a substantial magnetization nonuniformity of the article owing to the discontinuity. The nonuniformity smooths out as magnetizing field H ₀ increases. The increase in magnetizing field H ₀ increases the nonuniformity of the field distribution over the article surface, thereby changing the topography of the flaw field. In particular, in low magnetizing fields, this change leads to the absence of negative extrema in the curve of the tangential component of the flaw field, H _x(x). The discrepancy between the calculated and experimental values of the fields of flaws characterized by different geometric parameters is indicative of a considerable effect of the flaw opening on calculated data. These data should be improved through proper corrections obtained experimentally.

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