MIG Welding
MIG/MAG (GMAW) welding feeds a continuous wire electrode through the torch with shielding gas, making fast, strong welds on mild steel, stainless steel and aluminium. It is the most productive process for general fabrication and thicker sections.
What it is
The wire acts as both electrode and filler, fed automatically, so welders can lay long welds quickly. CO2 or argon-CO2 mixes shield steel (MAG); pure argon shields aluminium (MIG).
MIG welding is easy to automate with robots for high-volume production parts.
Typical applications
- Structural and frame fabrication
- Heavy brackets and base frames
- Agricultural and construction equipment
- Automotive and trailer parts
- Robotic production welding
Suitable materials
- Mild and structural steel
- Stainless steel
- Aluminium
- Low-alloy steels
Points to consider
- Spatter may need cleaning on visible surfaces.
- Use TIG instead for very thin or highly cosmetic joints.
- Robotic MIG suits repeat production with fixtures.
- Specify fillet sizes to avoid over-welding and distortion.
Frequently asked questions
What is the difference between MIG and MAG?
Both use wire-fed welding. MIG uses inert gas (argon, for aluminium); MAG uses active gas mixes with CO2 for steel. The terms are often used interchangeably.
Is MIG welding good for thick steel?
Yes. With multiple passes it welds thick sections efficiently.
Can MIG welding be automated?
Yes. Robotic MIG welding is common for repeat production parts with fixtures.