DIN EN 287-1:2004 Testing of welders – Fusion welding – Part 1: Steels; German version EN 287-1:2004
DIN EN ISO 5817:2003 Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) - Quality levels for imperfections (ISO 5817:2003); German version EN ISO 5817:2003