I have decide to go with the dom pipe for my frame i belive it is 1.25"x .120" DOM and i was curious about the gap for the pipe and what it should be? should there be one if i mill the joints? like in school we use like 1/8" gap and land for pipe in arc welding and mig i know its a totally different application but here again i want to do it right and i know i want to get good penetration and what not, i have a hobart handler 140 i believe its 115v and it runs off 220....my question is i have flux core in right now and i believe i am running .030 diameter flux core wire in my machine right now....what setting should i run this at to achieve proper penetration and should i go with gas instead of the fluzx core and what kind of wire and diameter should i use? and should i get a 95:5 tank or a 75:5 tank?