Ultrasonic Testing of DSAW Pipe
In the ultrasonic inspection of dsaw pipe, how to identify and determine the echo is a key issue. The influence of ultrasonic defect signal or non-defect signal and the radius of curvature of the steel pipe on the defect location is analyzed by analyzing the characteristics of the actual ultrasonic testing of the double-sided submerged arc welded pipe weld, including the segregation, inclusions, crack and base metal delamination of the ultrasonic echo signal. This paper summarizes the causes and identification methods of four kinds of pseudo-defective waves, such as the reflected wave of the coupling agent, the reflection wave of the weld surface, the reflected wave caused by the upper and lower dislocation of the weld, and the non-defect wave formed by the weld height or the undercut The accuracy of the defective wave discriminating provides a new idea and direction for the actual ultrasonic testing of the dsaw pipe. In the ultrasonic inspection of steel p...