Aluminum welding has two mainstream processes: MIG (GMAW) and TIG (GTAW). Choose the right one and you get both productivity and appearance; choose wrong and you get anything from an ugly bead to a scrapped batch. This guide from Mastership (sole authorized distributor of Canadian Indalco aluminum welding consumables in Asia) sets out the differences and when to use each.
Aluminum MIG: fast, for production work and medium-to-heavy plate
MIG feeds layer-wound wire continuously at a high deposition rate, suiting plate of 3 mm and above and volume production: frames, trailers, tanks, structural work. Aluminum MIG normally runs in spray transfer or pulsed mode rather than short-circuit transfer. The challenge is that aluminum wire is soft and prone to birdnesting — the feeding arrangement (a spool gun or a push-pull system, with U-groove drive rolls and a PTFE liner; essential over longer feed distances) and the quality of the wire itself decide success or failure. That is exactly why imported wire — stable feeding, tight diameter tolerance — is worth the investment.
Aluminum TIG: refined, for thin sheet and cosmetic parts
TIG adds cut-length rod by hand and uses alternating current (AC), whose electrode-positive half cycle breaks up the aluminum oxide film. The result is a fine, attractive bead with well-controlled heat input, suiting sheet under 3 mm, tubing, bicycle frames and parts with high cosmetic requirements. The downsides are speed and the level of welder skill required.
Quick comparison
| MIG (GMAW) | TIG (GTAW) | |
|---|---|---|
| Speed | Fast — suits production | Slow — precision work |
| Thickness | About 3 mm and up | Thin sheet and precision parts |
| Appearance | Function first | Fine stack-of-dimes finish |
| Skill threshold | Moderate (the feed system must be set up properly) | High (two-handed coordination) |
| Consumable form | Layer-wound spool | Cut-length rod |
| Typical applications | Trailers, tanks, structures | Bicycle frames, tubing, repair |
Frequently asked questions
Is every grade available in both MIG and TIG form?
Yes. Indalco supplies the full grade range (ER4043, ER4047, ER5183, ER5356, ER5554) as both MIG layer-wound spools and TIG rods with identical chemistry — so mixing both processes on one part raises no compatibility concern. For grade selection see our aluminum welding wire selection guide.
Aluminum MIG keeps feeding badly — what should I check?
Start with three things: whether the drive rolls are U-groove (not V-groove), whether the liner is PTFE, and the diameter tolerance and layer-winding quality of the wire itself. Over longer feed distances, consider a spool gun or push-pull setup. If it still jams after switching to a consistent wire, contact us — we provide technical consultation on feeding systems and parameters.
Which process for thin sheet?
Under 2 mm, TIG first. Between 2 and 3 mm, pulsed MIG gives you production speed while keeping heat input under control.
Both processes, one source
Mastership is the sole authorized distributor of Canadian Indalco aluminum welding consumables in Asia, with MIG spools and TIG rods in stock across every grade, approved by ABS, DNV and other international bodies. Contact us with your base metal and process — we will help you specify the material and provide samples.
Mastership | Aluminum Welding Consumables