FLAW EVALUATION METHOD OF TWO-LAYERED BELLOWS AND EDDY CURRENT FLAW DETECTOR USED THEREIN

摘要

PROBLEM TO BE SOLVED: To provide a flaw evaluation method of bellows capable of rapidly and simply evaluating the flaw such as corrosion or damage of the bellows even in the bellows having a two layered structure, and an eddy current flaw detector used therein. SOLUTION: The flaw of the two-layered bellows 100 obtained by molding two metal thin plates is evaluated. A sensor 20 is scanned along the protruded surface 104a on the first layer side being the outside of the thin plate to perform eddy current flaw detection while a transmission and reception element is scanned along the protruded surface 104a on the side of the first layer to perform ultrasonic flaw detection. The flaw is evaluated on the basis of the receiving signals of eddy current flaw detection and ultrasonic flaw detection. COPYRIGHT: (C)2008,JPO&INPIT