Non destructive testing of steel tubes. Part 7: automatic full peripheral ultrasonic testing of seamless and welded (except submerged arc welded) steel tubes for the detection of longitudinal imperfections.

• 钢管的无损试验。第7部分:纵向缺陷探测用无缝钢管和焊接(除埋弧焊外)钢管的自动全周边超声波试验。