I spent a summer as a teenager working part time at a welding shop. I was not a welder, I just spent the mornings cutting up scrap steel with a torch out back in the scrap heap. I was amazed, however, at what I saw those guys fix (they were older than the hills, but they sure knew their stuff) . Out in the middle of Kansas farm / oil country there was plenty of broken and worn out stuff for them to work on. There were things that I never would have thought could be fixed that they fixed.
I remember some farmer brought in a tractor with a big long crack in the crankcase. The tractor frame and crankcase were one huge iron casting. They put natural gas torches underneath and slowly heated the whole thing up, then they used, if I remember correctly, something called "electric bronze" to weld the crack up.
How much they charged for a job depended whether or not the customer had pissed them off before or not........ I remember hearing some colorful discussions of past transgressions......
Festus