ULTRASONIC FLAW DETECTION METHOD USING VERTICAL AND HORIZONTAL DIFFRACTED WAVES AND APPARATUS THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a method for estimating the position of a flaw such as a crack or the like simply and accurately without using a complicated method which requires complicated operation said to be B-scanning in a conventional TOFD method in order to locate the flaw such as the crack or the like and a combination with a conventional ultrasonic flaw detection method such as a pulse reflecting method or the like is required in an object difficult in B-scanning. SOLUTION: A transmitting probe 1 and a receiving probe 2 both of which form a pair are arranged on the surface of an object 3 so as to leave a definite distance and ultrasonic waves are radiated to the inside of the object from the transmitting probe 1 while diffracted waves generated at the end of the flaw present in the object are received by the receiving probe 2 to respectively detect the vertical and horizontal waves of the diffracted waves. On the basis of the arrival time difference between the detected vertical and horizontal waves, the distance L from the end of the flaw generating the diffracted waves to the receiving probe 2 is estimated. COPYRIGHT: (C)2005,JPO&NCIPI