Mig Welding Wire Er70s-6 0.035 X 44 Lb Roll Copper Coated Layer Wound ER70S-6 is a mild steel welding wire that contains high level of manganese and silicon produces high quality welds when used on dirty, oily or rusty steel. S-6 wire is engineered to provide porosity-free, x-ray quality welds at the highest tensile strenght The high silicon content increases the fluidity of the weld pool creating a smoother bead appearance This product requires a shielding gas of CO2 and/or CO2 mix; conforms to AWS 5.18 and CSA 48.4