BIT INSPECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a bit inspection method capable of easily moving an ultrasonic probe and performing flaw detection with equivalent precision over the whole flaw detection surface.SOLUTION: A bit inspection method comprises: a shape measurement step of measuring a thickness dimension of a carbide tip 10 with its front surface 11 and back surface 12 being non-parallel to each other; a reference thickness dimension determination step of determining an average value of thickness dimensions as a reference thickness dimension; a correction coefficient calculation step of calculating a correction coefficient of an echo value from a difference between a thickness dimension at a measurement point P and the reference thickness dimension; an ultrasonic flaw insepction step of performing an ultrasonic flaw inspection of a brazed surface 3, by setting the brazed surface 3 corresponding to a position having the reference thickness dimension to match a focal distance of an ultrasonic probe 2 and moving the ultrasonic probe 2 along the front surface 11 of the carbide tip 10; a correction step of calculating a corrected echo value by multiplying a measured echo value at each measurement point P obtained in the ultrasonic flaw inspection step by a correction coefficient; and a determination step of determining whether a brazing state is good or bad based on the corrected echo value.