I took a summer semester (short) of body 101 at a local jr college in the early 90's. We had to pass his hammer test to start working on our own projects, no real instruction, just help as needed. So I can warp 2 pieces together that just happen to stick to each other. I watched him weld a patch in and then hammer weld it clean.......it was f'ing art. I tend to always be working on something with no time to practice, so the torch is for cutting and bending. I hope in the future after retirement to spend time practicing, right now screwing up my stuff and re doing it is practicing . Sadly no "shop" class in my H.S, then later all the college courses for welding (or engine building) were during the day only and I was already working full time and out on my own. There wasn't anything real industrial around here back then, hell I still need to go a few towns north and inland to get welding gas now.