Welding when you’re not 40 anymore…

I remember my metal shop teacher in high school cut an old (pre-aluminum) Coke can in half and gas welded it back together with an absolutely jewelry like bead.

Same teacher said he gave a kid an A for welding dissimilar metals together. The kid stuck a stainless steel ruler through the vents of a large shop transformer and hit the copper bus bar inside the machine. A bolt of electricity shot across the room narrowly avoiding killing the kid. Wes Cravens was the teacher's name. Funny guy with mad skills.