Welding electrode wire, Cu coated with the addition of deoxidizing agents Mn and Si, designed for semi automatic welding under the protective atmosphere of CO2 (MAGC) or mixtures M21-80% Ar + 20% CO2 (MAGM). It is used for welding of unalloyed construction steels, boiler steels, shipbuilding steels, and low alloyed, general-purpose C-Mn steels of increased strength. Welding electrode wire can be in the range of 1.20 to 1.60mm for fabrication and 2.50 to 3.15mm for the Pipe manufacturers.