Correlation relations of the magnetic fields of model and natural defects in the magnetic flaw detection of articles

The effect of the magnetisation processes on the correlation relations of t he fields of artificial defects, such as a rectangular slot, and of natural defects of hot-rolled tubes in magnetic flaw detection is investigated exp erimentally. It is shown that the correlation of the transducer signal from a deep defect is degraded considerably when is width decreases. An increas e in the magnetizing field leads to a reduction in the linear correlation c oefficient between the transducer signal and the deep defect, and leads to its increase when measuring dependences on the width of the defect and its transverse cross sections.