ISO/R 947:1969/Add 1:1969Recommended practice for radiographic inspection of circumferential fusion welded butt joints in steel pipes up to 50 mm (2 in) wall thicknessAddendum 1
This addendum applies to ISO/R 947Recommended practice for radiographic inspection of circumferential fusion welded butt joints in steel pipes up to 50 mm (2 in) wall thickness