OK, time for a stupid question.
I know you need an AC TIG machine to TIG weld aluminium, and I understand the theory as to why (alternate cycles clean oxides, then weld).
I also know you can use a MIG for aluminium with a spool gun, or without if the wire is thick enough.
What I don't understand is, why is it OK to use DC with a MIG? Why doesn't MIG require the same cleaning/welding cycle as TIG?
Note, I'm just asking for my own curiosity, I don't need to do any aluminium welding at the moment. It just has me curious.
I know you need an AC TIG machine to TIG weld aluminium, and I understand the theory as to why (alternate cycles clean oxides, then weld).
I also know you can use a MIG for aluminium with a spool gun, or without if the wire is thick enough.
What I don't understand is, why is it OK to use DC with a MIG? Why doesn't MIG require the same cleaning/welding cycle as TIG?
Note, I'm just asking for my own curiosity, I don't need to do any aluminium welding at the moment. It just has me curious.
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