Suitable for 100% CO2 and Argon & CO2 mixed gas protective ... 6 is a mild steel copper coated welding wire suitable for 100% CO2 and argon & CO2 mixed gas protective ... E,A36,D36,E36)and equive lant mild steel for 550 Mpa grade mild alloy steel,such as container ... ,vechiles,construction machine,rail way construction,pressure vessel for semi-auto or automatic gas shield welding.Chemial composition of ...