Our son owns a Millermatic 180 MIG machine. We want to surprise him with the Spoolmate 100 spoolgun for his birthday, as we know he wants to do some aluminum welding.

What else does he need besides the spoolgun to weld aluminum?

Does it require a different gas? If so, does this different gas also weld steel? Or, will he need to keep two different gas tanks at home ... one for welding steel and one for welding aluminum?

Thanks in advance for any info.