Shielding Gas For Mig Welding. The basic gas for MIGMAG welding is argon Ar. However increased oxygen created from CO2 can lead to porosity.
For example you can weld mild steel with any of the following shielding gases. Inert gas is used for MIG welding or metal inert gas welding use inert gas as a shielding gas. Helium He can be added to increase penetration and fluidity of the weld pool.
Argon MIG welding gas replaces the Air Oxygen from around the weld pool.
So it is better to search for a MIG welding wire with powerful deoxidizers. The shielding gas used for MIG welding gas is a MIG welding gas mix of inert gases. It works well in MIG welding providing good penetration and speed but tends to cause more spatter in pure form. For ¾ inch 30-40 CFH should be enough.