As I have said before on the subject of welding anything clean & tight, fitment that is. I have 7 years in everything from TIG to MIG to aluminum& stainless I have tried most of the combos and machines and will say get more education & ask lots of dumb questions. Try welding some heavy scrap and find out were your machine does the best. Also if you had to you could help out the penetration of your weld by pre heating your work piece not to hot though no color just nice and warm maybe 400-500 F good luck. burn it man!