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Once you've mastered MIG-welding steel with your welder, you can move onto other materials such as aluminum. Certain models of welders, including the Millermatic 210, offer optional spool guns, which have their own wire supplies built into the gun. Switch out the bottle of argon/CO2-mix shield gas for straight argon, and you can easily MIG-weld aluminum together. That's another story altogether, though, and something we will later.