Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) - Quality levels for imperfections (ISO 5817:2003 + Cor. 1:2006); German version EN ISO 5817:2007— 35 стр.
Specification and qualification of welding procedures for metallic materials - Welding procedure test - Part 13: Upset (resistance butt) and flash welding (ISO 15614-13:2012); German version EN ISO 15614-13:2012— 22 стр.