Ключевые слова:
Welders, Approval testing, Welding, Fusion welding, Copper, Copper alloys, Performance, Acceptance (approval), Certification (approval), Certificates of conformity, Examination (education), Testing conditions, Test specimens, Welded joints, Butt joints, Sheet materials, Fillets (shape), Pipes, Dimensions, Shape, Visual inspection (testing), Mechanical testing, Physical testing, Designations