| 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 preparation step of preparing a carbide tip sample 15 simulating an actually used carbide tip 10, by formation with the same material or the like; a sample inspection step of performing an ultrasonic flaw inspection on a back face 17 of the carbide tip sample 15 regarded as a flaw detection surface; a reference echo value selection step of selecting a reference echo value on the basis of echo values obtained in the sample inspection step; a correction coefficient calculation step of calculating a correction coefficient by dividing the reference echo value by the echo value; an ultrasonic flaw inspection step for performing an ultrasonic flaw inspection on a brazed surface 3, of an actually used bit 1, regarded as a flaw detection surface; 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 corresponding correction coefficient; and a determination step of determining whether a brazing state is good or bad based on the corrected echo value. |
