Filler metal may be added, if necessary. An inert shielding gas supplies shielding for the arc. Mig Welding Flux is contained within the electrode. Additional shielding may be added. It generally calls for little post weld cleanup.
Shielding is obtained from an externally supplied gas or gas mixture.
Spray Transfer - Metal is transferred across the arc creating a continuous spray of fine droplets of metal. These droplets are projected down to the base metal. For thicker sections, argon-helium mixtures or pure helium may be used. Pure helium may also be employed for deeper penetration. The voltage may be somewhat lower if argon with 20 to 25 percent CO2 mixtures is selected.