i currently have a miller "the legend" aead-200le and was thinking of buying one of these suitcase mig guns. The 2012 miller catalog says they do not recommend using AC power sources with this product and i need something to run aluminum wire. Will one of these suitcase welders work? i know to tig weld aluminum HFAC is preffered..... whats the hook up procedure for aluminum mig? AC? DC? Reverse polarity or straight? thanks in advance