Forney Mild Steel Mig Wire ER 70S-6 mild steel MIG GMAW welding wire is a high strength mild steel MIG wire. Ideal for auto body repair and fabrication on most ferrous metals. Contains a high level of manganese and silicon for a superior weld, even on rusty, dirty steel. Produces a smooth bead which requires less grinding. Not recommended for aluminum engines. Required Shielding Gas Argon/CO2. AWS Classification ER70S-6, Diameter 0.035 In., Weight 33 Lb., Color Code Yellow, Required Shielding Gas Argon/CO2, Recommended Polarity DCEP Reverse, Tensile Strength 70,000 psi, Pkg Qty 1, Package Type Box WARNING This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.