Ultrasonic testing (UT) has limitations when used for detecting stress corrosion cracking (SCC) in pipelines, primarily due to the nature of SCC and the characteristics of UT techniques. SCC consists of tight, often branched cracks that are typically oriented perpendicular to the direction of stress. A primary limitation is crack orientation. Conventional UT techniques, particularly angle beam UT, rely on reflecting sound waves off of defects. If the cracks are tightly closed or have a complex branching morphology, the reflected signal may be weak or difficult to detect. Another limitation is crack size. SCC cracks are often very small, sometimes only a few m....
Log in to view the answer
