My friend wants to build a light weight off road camper trailer. He wanted to use aluminum for the body frame, not undercarriage. I have zero experience welding aluminum and he has no experience welding other than 25 years ago in high school AG. He is going to be disappointed if he cant do alum with it.
I just want a welder around the farm for general maintenance and light fab. I don't plan on using Tig and honestly would have probably been fine with one of the tombstone stick welders. However, I do like mig more than stick, I hear Ron Popeil in my head, "just set it.... and forget it". I'll probably buy a tank and set it up for mostly mig. I am not a certified welder but have welded enough "professionally" that I know how to stick steel together with a mig or stick. I can also fake my way around an acetylene welding rig for thin easy stuff. Had a certified welder friend at work that taught me basics of tig, but the machine was already set and I only ran a handful of feet of bead on a stainless tank. It seemed almost exactly like gas welding. Some of the equipment I used to be over were tube mills and roll formers. We had an "auto" tig rig on the tube mill to weld the coils together and the roll formers we would use a gas rig to weld the coils together. The welds had to be strong enough to be bent and formed and still hold the tails of the coils together while also thin enough to make it through the dies. It caused you to have to get good at it. Typical thickness was from .029 to .105 and only 3-6" slit width. The gas rig is totally manual, just a torch. The tig rig is "automatic" in that it's on rails, starts, moves, and stops automatically, but you still have to kind of guide it and adjust the speed to get a good weld.