I'm guessing he is talking about mig (considering all of the wire size talk). You can mig aluminum and tig aluminum, although aluminum is one of the harder metals to weld. It's such a good conductor of heat that it has a tendancy to just melt away once you get a good pool going. Don't get me wrong any welder worth his craft can weld aluminum no problem but steel is just easier. People often learn on stick or mig first these days because they are the most common types (and much cheaper than tig).

Don't have any experience with gas welding with a torch sorry.

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