I'd never even think of welding a roll cage. I do a lot of bench welding and I can make a nice bead when I have my arms in the right position but there is zero chance I could get nice welds when I'm laying on back reaching around a corner or something like that. The chassis guy that did my cage really had to work to get to a few of the welds. They tig welded the cage and on some welds he had a helper run the foot pedal while he handled the torch and rod. Those guys work as a team and do that type of welding all the time. I never do that type of welding and I'm not going to start on something like a roll cage.