Weld Procedures Qualification Records and Weld Procedure Specifications and Welder Qualifications according to: 
EN 15614 – Weld Procedure Qualification Report (WPQR)
EN 15609 – Weld Procedure Specification (WPS)
EN 287 – Qualification Test of Welders
ASME Section IX, ANSI/AWS 2.4 – Weld Procedure Qualifications, Weld Procedure Specifications and Qualification Tests of Welders

Quality Levels for Imperfections and general tolerances of the welded constructions
EN ISO 5817 – Quality Levels for Imperfections
EN ISO 13920 – General tolerances for welded constructions – Dimensions for lengths and angles – Shape and position