CALIBRATION METHOD OF ULTRASONIC FLAW DETECTION AND QUALITY CONTROL METHOD AND PRODUCTION METHOD OF TUBULAR BODY

摘要

An ultrasonic flaw detection is performed to a welded portion 2 of a pipe body 1 in at least a pipe axis direction, a defect detection threshold value is determined based on the signal intensity difference between the total area of the defects existing in the region of an ultrasonic beam on a welded surface and an artificial defect, and a quality control of the pipe body is performed based on the defect detection threshold value. An equivalent defect diameter is determined from the defect density, which is determined from a desired quality level, on the welded surface of the welded portion of the pipe body in a pipe axis direction and the area of the ultrasonic beam on the welded surface based on the total area of the defects existing in the region of the ultrasonic beam, and the defect detection threshold value is determined based on the equivalent defect diameter and the signal intensity difference of the artificial defect.