LEAKAGE FLUX TYPE FLAW DETECTOR

摘要

PURPOSE: To provide a leakage flux type flaw detector which detects defects in the end part of a plate. ;CONSTITUTION: When a leakage magnetic flux from a plate material S magnetized by an excitation yoke 2 is detected by a probe 5 scanning in parallel to the surface of the plate, one magnetic pole 3b of the excitation yoke 2 is arranged adjacently to the end face of the plate material S via a predetermined gap (h), and the other magnetic pole 3a is disposed adjacently to the surface of the plate material S via a predetermined gap (g). The probe 5 is turned within a plane parallel to the surface of the plate to scan up to the side face of the magnetic pole 3b on the end face of the plate material. Accordingly, defects can be detected irrespective of the direction of the defective part up to a position very close to the end part of the plate.;COPYRIGHT: (C)1996,JPO