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MIG, TIG and MMA: Differences and When to Use Each
By PT Abadi Baru Teknikatama · · 3 min read · Last updated: 8 October 2026
Summary
MIG/MAG, TIG and MMA are the three most common arc welding processes in workshops. MIG/MAG stands out for productivity, TIG for neat and controlled results, and MMA for site work with simple equipment. This guide explains the differences, with a short comparison table and questions that help you choose both the process and the welding machine.
All three processes use an electric arc to melt metal, but they differ in the electrode, the way the weld pool is shielded and the working speed. Those differences determine where each process makes the most sense to use.
What is MIG/MAG welding?
MIG/MAG (GMAW) uses a welding wire that is fed continuously by a wire feeder and serves as both the electrode and the filler metal. The weld pool is shielded by gas from a cylinder: an inert gas for MIG, and an active gas such as CO2 or an argon-CO2 mixture for MAG.
Because the wire is fed without interruption, the process is productive and relatively easy to mechanize. Its limitation: the shielding gas is easily disturbed by wind, so it is less than ideal in open areas without wind protection.
What is TIG welding?
TIG (GTAW) uses a non-consumable tungsten electrode with an inert shielding gas such as argon. The filler metal is added separately, usually by hand.
Control of the heat input and the weld pool is very good, and the weld is clean with almost no spatter. The process is commonly used for thin materials, stainless steel, aluminium and joints that demand a neat appearance. The trade-off is a lower welding speed and a higher level of operator skill.
What is MMA welding?
MMA (SMAW), often called stick welding or electrode welding, uses a stick electrode covered with flux. As it burns, the flux produces a shielding gas and slag that covers the weld metal.
The equipment is simple and easy to carry, with no gas cylinder. That is why MMA is widely used on site, in repair work and in construction. Its limitation: electrodes have to be changed frequently and the slag has to be removed, so productivity is lower than with MIG/MAG.
Quick comparison table
| MIG/MAG (GMAW) | TIG (GTAW) | MMA (SMAW) | |
|---|---|---|---|
| Electrode | Continuously fed wire, consumable | Tungsten, non-consumable | Flux-covered stick |
| Shielding | Gas from a cylinder | Inert gas from a cylinder | Gas and slag from the flux |
| Working speed | High | Low | Medium |
| Neatness of the weld | Good | Very good | Slag removal required |
| Windy site work | Less suitable | Less suitable | Suitable |
| Commonly used for | Production and fabrication | Thin materials, stainless steel, aluminium | Site work, repair, construction |
How do you choose the process and the machine?
Answer the following questions before comparing machines:
- What material and thickness do you weld most often?
- Where is the work done: in an enclosed workshop or on site?
- How large is the work volume per day, and does it need to be mechanized?
- What standard of result is required: strength only, or appearance as well?
- What electrical supply is available (voltage and phase)?
If your work is varied, a multi-process welding machine can be an option because one power source serves several processes. For repetitive production, also consider mechanization equipment such as a welding carriage, so that travel speed and weld quality are more consistent.
Provide the answers to the five questions above when requesting a quotation, so that the recommended machine and its accessories match your needs.
Frequently Asked Questions
What is the difference between MIG and MAG?
Both use a continuously fed welding wire. MIG uses an inert shielding gas such as argon, generally for non-ferrous metals. MAG uses an active gas such as CO2 or a CO2 mixture, generally for steel. In practice, the term MIG is often used for both.
Which welding process is suitable for outdoor work?
MMA (covered electrode welding) is commonly chosen for site work because its arc shielding comes from the electrode flux, so it does not depend on gas cylinders and is more tolerant of wind than gas-shielded processes.
What is a multi-process welding machine?
A multi-process welding machine is a single power source that can be used for several processes, for example MIG/MAG, TIG and MMA. It is practical for workshops that work on a variety of materials and joint types.
Discuss your requirements with the Abadi Baru team
Tell us about the job, the material and the capacity required. The sales and technical teams help with a recommendation before a quotation is prepared.