NF A49-785-7:2011 Non-destructive testing of steel tubes - Part 7 : digital radiographic testing of the weld seam of welded steel tubes for the detection of imperfections.
2011NF A49-785-7:2011 Non-destructive testing of steel tubes - Part 7 : digital radiographic testing of the weld seam of welded steel tubes for the detection of imperfections.