Filler material is necessary in metal inert gas welding. Conventional MIG welding (using a constant voltage DC power source) and pulsed MIG welding(using a periodic voltage DC power source) are the two types of metal inert gas welding.
Metal Inert Gas (MIG) Welding:
- An arc is struck between a consumable electrode and the sheet metal to be welded. The consumable electrode is in the form of continuous filler metal.
- An inert gas surrounds the arc and shields it from the ambient to prevent oxidation.
Tungsten Inert Gas (TIG) Welding:
- An arc is struck between a tungsten electrode (non-consumable) and the sheet metal to be welded.
- An inert gas shields the arc from the ambient to prevent oxidation.
- A filler material is optional
- Carbon steels, low alloy steels, stainless steels, most aluminum alloys, zinc based copper alloys can be welded using this process.
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