Double-deoxidised mild steel MIG wire, free from copper coating with increased silicon and manganese content for welding unalloyed and low-alloyed mild and medium tensile steels requiring good impact toughness down to -20C. Manufactured with a high-quality uncoppered finish for improved feeding and conductivity, SIFMIG ZERO SG3 typically provides a higher ultimate tensile strength over standard SIFMIG SG2 and the absence of copper on the wire surface results in a cleaner deposit and avoids the metallurgical risks of increased copper in the weld pool.