Yes you will need Ac to weld Ali to any standard, though it can be done with mig. (Not very good looking welds and not as controllable as tig)
I have one of those and they are a good machine if you are only doing steel/stainless.
Hi Dale
Indeed it is your experience of the R-Tech that started me looking at it. Just how grim is ali welding when done with MIG? I only want to be able to weld ~ 3mm ali extrusion for bracket manufacture for my motorbike and such-like, no significant structural constructions are planned and a bit of post-weld filing wouldn't be the end of my world.
Cheers
Richard