Defect Equivalence Differences in Ultrasonic Testing of Forging with Straight Probes of Different Frequencies

Through the theoretical analysis and experimental verification, it is found that flat bottom hole defect equivalent values will change greatly while ultrasonic testing of the large forgings (diameter×thickness=ϕ4 480 mm×800 mm) with straight probes of different frequencies. It can be used for ultrasonic detection peer reference.