Apparatus and process for flux leakage testing using transverse and vectored magnetization

摘要

An apparatus and process for detecting both longitudinal and circumferential defects in a test object relatively rotating and longitudinally translating with respect to a test apparatus is disclosed. Means are provided for producing a transverse magnetic field in the object. Additional means provide a longitudinal magnetic field intersecting the transverse magnetic field in the first test region of the object. Magnetic sensing means then provide output signals in response to the presence of flux leakage from the test region due to defects. Circuits responsive to the output signals are provided for indicating flaws.