OK Autrod 12.58 is a copper-coated, Mn-Si-alloyed G2Si/ER70S-3 solid wire for the GMAW of non-alloyed steels, as used in general construction, pressure vessel fabrication and shipbuilding. The wire has a carefully controlled wire chemistry and a unique surface technology providing superior weld-metal quality at high wire feed speeds and high welding currents. The wire can be used with both Ar/CO² mixed gas and pure CO² shielding gas.