The wire feed welder is a MIG welder.

can weld aluminium with a mig or tig welder

A clarke mig welder is considered a top of the line welder and can be purchased at specialty welding stores or even at hardware stores like home depot or menards. They can also be bought online.

yes

there is no such thing as a gasless mig welder because mig stands for metal inert gas. you must have tubular wire which has the flux in the wire. i would say you should get some s wire to do the job