Lincoln's premium mild steel MIG wire, Super Arc® L-56 is an excellent choice for welding on metals with a medium-to-high presence of dirt, rust or mill scale. It's also second to none in puddle fluidity, bead profile and spatter-control. Super Arc® L-56 is a low carbon, high manganese, and very high silicon wire that features Lincoln's exclusive no-flake copper coating for better arc starting characteristics and longer contact tip life.