Miller Electric Bobcat 250 manual Common MIG Shielding Gases, Application, Fillet

15-15. Common MIG Shielding Gases

This is a general chart for common gases and where they are used. Many different combinations (mixtures) of shielding gases have been developed over the years. The most commonly used shielding gases are listed in the following table.

			Application
Gas	Spray Arc Steel	Short Circuiting	Spray Arc	Short Circuiting	Spray Arc	Short Circuiting
		Steel	Stainless Steel	Stainless Steel	Aluminum	Aluminum
Argon					All Positions5	All Positions
Argon + 1% O2	Flat & Horizontal5		Flat & Horizontal5
	Fillet		Fillet
Argon + 2% O2	Flat & Horizontal5		Flat & Horizontal5
	Fillet		Fillet
Argon + 5% O2	Flat & Horizontal5
	Fillet
Argon + 8% CO2	Flat & Horizontal5	All Positions
	Fillet
Argon + 25%	Flat & Horizontal1	All Positions		All Positions3
CO2	Fillet
Argon + 50%		All Positions
CO2
CO2	Flat & Horizontal1	All Positions
	Fillet
Helium					All Positions2
Argon + Helium					All Positions2
Tri-Mix4				All Positions

1Globular Transfer

2Heavy Thicknesses

3Single Pass Welding Only

490% HE + 7-1/2% AR + 2-1/2% CO2

5Also for GMAW-P, All Positions

OM-4419 Page 69