44 صفحه PDF
BS EN 287-1:2011-Qualification test of welders-Fusion welding, Part 1:Steels
BS EN 287-1:2011-Qualification test of welders-Fusion welding, Part 1:Steels
44 صفحه PDF
BS EN 287-1:2011-Qualification test of welders-Fusion welding, Part 1:Steels