The effect of ultrasonic search units on the detectability and size evaluation of planar flaws

초음파(超音波) 탐촉자 특성(特性)이 판형결함(板形缺陷)의 크기 평가(評價)에 미치는 영향(影響)

The effect of ultrasonic search units on the detectability and size evaluation of planar flaws was studied for thicker ferritic material using the technique of the DAC curve and reference level. Cylindrical holes were used as calibration reflectors. The planar flaws such as disc and band types were machined. They were detected and evaluated with different search units and sizing criteria. The value evaluated was compared with the actual dimension of planar flaws.