SY/T 6423.1-2013 Petroleum and natural gas industries—Non-destructive testing (NDT) methods of steel tubes—Part1:Radiographic testing of weld seam of welded steel tubes for detection of imperfections
Petroleum and natural gas industries—Non-destructive testing (NDT) methods of steel tubes—Part1:Radiographic testing of weld seam of welded steel tubes for detection of imperfections