Hobart Megafil 713R description: MEGAFIL 713 R is a rutile flux cored wire for carbon steel applications. Fast freezing slag for higher deposition rates in all position. For Carbon steel applications with mixed gas 75-95% Argon (Ar)/ balance Corbon Dioxide (CO2) and 100 % Carbon Dioxide (CO2). Automatic and mechanized welding, Steel Structures.