This standard gives general recommendations and definitions for the welding of railway vehicles and associated components. Except for specific provisions laid down contractually, this standard applies to all assemblies, sub-assemblies or parts welded by and welding process, either manual or semi-automatic or automatic as defined in European standard EN ISO 4063. Materials employed in the manufacture of the above may normally include: - structural and alloy steels including castings; - wrought aluminium and cast aluminium alloys; - stainless steel alloys. Items of equipment subject to specific regulations are not relevant to the scope of this standard, i.e. air reservoirs.