The magnetic leakage fields are investigated experimentally on rectangular-slit flaw models for various magnetizing fields H 0 . It is shown that in certain cases the flaw parameters can be incorrectly classified as a result of coincidence of their leakage fields. This is associated with both the choice of the magnetizing fields H 0 and the effect of the flaw width on the dependence of the flaw field on H 0 : for wide flaws this dependence is close to a linear function, whereas for narrow flaws the dependence tends to the magnetization curve of the sample.
The harmonic content of a probe's electromotive force when magnetic testing is conducted with the use of alternating fields is significantly affected by the possible presence of a flaw in the specimen. Magnetic biasing of the specimen with a static field enables identification of internal flaws in addition to surface flaws. The electromotive force's harmonic content depends on the flaw's dimensions and depth. This circumstance can be used to determine these parameters in a separate way. The effect of a gap between the surface of a tested specimen and the probe is significantly weaker on the topography and amplitude of higher harmonics than on the corresponding parameters of the first harmonic. This observation, which holds for both internal and surface flaws, enables testing of larger gaps.
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