Detecting of the Defects in 2.25Cr1Mo Steel Block by Ultrasonic TOFD Technique

Based on the principle of ultrasonic TOFD technique for the detection, location and sizing of defects, the side drilled holes and notches in a 2.25Cr1Mo steel block of 110 mm in thickness were inspected using a multi-channel TOFD inspection system. The D scan and A scan images of defects were given .The corresponding relationship between D scan and A scan image was also analyzed. The errors of defects location and size were no more than 5%. The result validated the good measurement accuracy of ultrasonic TOFD testing. Thus, criterion was provided efficiently for evaluation of natural defect images examined by ultrasonic TOFD equipment on site.