Ultrasonic Testing for Butt Weld of Electric Penetration

Ultrasonic testing for butt weld of nuclear industry electric penetration was discussed，and some specimens with natural defects were made.According to reference block, specimens were tested by probes which were of different chip sizes and different refraction angles, echoes of different defects were obtained. Through analyzing echoes of surplus height of seam roots, effective methods of root echo recognition were foud out, which provided reference in practice.