Ok main point for spool gun is for the feeding of aluminum wire right? I loaded my I-mig 140 with some .030" aluminum wire and it feeds just fine. I know there will some contamination from the drive roller and torch liner but I really just wanna fool around to see if I can weld with it. Any tips I should do? I am just going to practice in maybe .080-.080 aluminum tubing. Do I set wire speed and voltage way low since its aluminum?