For mild steel MIG welding, Argon/CO₂ mixtures are commonly recommended. Pure Argon is generally used for aluminium TIG and MIG welding, while specialist Argon-based mixtures are used for stainless steel. Using the correct shielding gas improves arc stability, reduces spatter and enhances weld quality.
This guide covers which shielding gas to choose for each material and process, and why the right gas matters for weld quality.
Which shielding gas should I buy for mild steel?
For mild steel MIG welding, Argon/CO₂ mixtures are commonly recommended. They provide good arc stability and a balance of penetration and spatter control for general fabrication.
Which shielding gas should I buy for aluminium?
Pure Argon is generally used for aluminium TIG and MIG welding. It supports clean, stable arcs on aluminium across both processes.
Which shielding gas should I buy for stainless steel?
Specialist Argon-based mixtures are used for stainless steel. Choosing the correct mixture helps maintain arc stability and weld quality on stainless work.
Why does the right shielding gas matter?
Using the correct shielding gas improves arc stability, reduces spatter and enhances weld quality. Gas selection works alongside the right filler wire and machine settings — getting all three right is what delivers clean, consistent welds with minimal post-weld cleaning.
A quick reference
| Material and process | Recommended shielding gas |
|---|---|
| Mild steel MIG | Argon/CO₂ mixtures |
| Aluminium TIG and MIG | Pure Argon |
| Stainless steel | Specialist Argon-based mixtures |