WELDERS EN 287-1, 141 TIG – stainless steel and steel pipe– also mirror welding
WELDERS EN 287-1, 111 E – stainless steel and steel pipe
WELDERS EN 287-1, 141/111 TIG/E – steel pipe
WELDERS EN 287-1, 311 G – steel pipe
WELDERS EN 287-1, 135, 136 CO2 – steel material
LOCKSMIHTERS and PIPE FITTERS partly cognizant of isometric drawings