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Boxhead
1. Gas is friendlier to use, see 2. below
2. The difference between gas and gasless is the wire for gasless is hollow with flux in the core, and the result is similar to a stick welder, ie you get a layer of slag you need to chip off, whereas the gas acts as the flux (excludes oxygen and contaminants) and you get a clean weld
3. I don't think TIG will do the bigger stuff for you, but very usefull on alloy bits
4. Yes needs gas
Mig welding alloy needs straight Argon or special blends where as steel has an Argon CO2 mix. I have heard you can get away with just CO2 but I have not tried it.
I'm sure those more knowledgeable on the subject can clarify/confirm this, but overall your likely to get more use from a MIG.
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SLIPRY
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