NF A89-052-3*NF EN ISO 15609-3:2004 Specification and qualification of welding procedures for metallic materials - Welding procedures specification - Part 3 : electron beam welding.
1996NF A89-010-10:1996 SPECIFICATION AND APPROVAL OF WELDING PROCEDURES FOR METALLIC MATERIALS. PART 10 : WELDING PROCEDURE SPECIFICATION FOR ELECTRON BEAM WELDING. (EUROPEAN STANDARD EN ISO 9956-10).