NF A49-785-11*NF EN ISO 10893-11:2011 钢管无损检测 第11部分:焊接钢管焊缝纵向和/或横向瑕疵的自动超声波测试
Non destructive testing of steel tubes - Part 11 : automated ultrasonic testing of weld seam of welded steel tubes for the detection of longitudinal and/or transverse imperfections