The dependence of the minimum size of a detected flaw on the probe diameter and the operating gap has been derived and practically approved on a new automated line for testing the quality of railway wheels. The results of modeling showed that an increase in the gap at a constant probe diameter leads to a wider distribution of the flaw field, which causes an increase in the threshold flaw length. The dependence of the normal component of magnetic field Hz on the flaw length is presented. In practice, dependences of the minimum length of a detected flaw on the operating gap and probe diameter are of considerable interest. The theoretical results obtained have been confirmed experimentally, which has allowed for their further application in a new automated system that is based on the BD-12 HFM eddy-current flaw detector, satisfies all requirements formulated by the manufacturer, and is intended for testing interior and exterior lateral surfaces of railway wheels.
Eddy-current testing of quality of railway wheels
Prüfung der Qualität von Eisenbahnrädern mit Wirbelstrom
Russian Journal of Nondestructive Testing ; 41 , 3 ; 189-192
2005
4 Seiten, 7 Bilder, 6 Quellen
Aufsatz (Zeitschrift)
Englisch
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