In TIG welding, a tungsten electrode heats the metal you are welding and gas (most commonly Argon) protects the weld puddle from airborne contaminants. TIG welding produces clean, precise welds on any metal.
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The best feeding of wire for aluminum is done with a spool gun. If you can't use a spool gun, use the shortest gun possible and keep the gun as straight as possible. Use argon only for shielding gas. Only use a push gun technique when welding aluminum.
Stick Welding (SMAW or Shielded Metal Arc Welding)
MIG Welding (Metal Inert Gas, also known as GMAW or Gas Metal Arc Welding)
Flux Cored Arc Welding (FCAW)
TIG Welding (Tungsten Inert Gas, also known as GTAW or Gas Tungsten Arc welding)