SY 6423.2-2013 石油天然气工业承压钢管无损检测方法第二部分：焊接钢管焊缝纵向和/或横向缺欠的自动超声检测
Non-destructive testing methods for pressure-bearing steel pipes in the oil and gas industry Part II: Automatic ultrasonic testing of longitudinal and/or transverse imperfections in welded steel pipe welds