Lincoln's premium copper coated MIG wire, Super Arc® L-56 is an excellent choice for welding on metals with a medium to high presence of mill scale. For best performance use on clean, oil-free, and rust-free base material. Best weld appearance and toe wetting when compared to ER70S-3 and ER70S-4 classifications. Super Arc® L-56 has high silicon and manganese oxidizer levels. Superior feed ability and excellent Arc characteristics are trade-marks of Super Arc® L-56. Shielding gases include argon/carbon dioxide blends, argon/oxygen blends, 100% carbon dioxide, and three or four-part gas blends.