J0406-4-5 Defect detections in elbow pipes using guided waves and their propagation phenomena

Abstract

Sensitivity of defect detections using guided waves through elbow pipes has been experimentally evaluated. The T(0,1) mode guided wave was used for the evaluations. The sensor system was cramped on the straight part of the two straight parts welded to the both sides of elbow part. The artificial defects were introduced at the other straight part. To evaluate the sensitivities, artificial defects were gradually increased by 0.05 mm step. Many spurious signals were confirmed due to the welds and elbow. It was also confirmed that the sensitivity decreased to 1/3-1/4 compared to the straight pipes.