I learned to weld when I was a millwright in the 70's in heavy industry. At that time all of the crafts were separate. You had welders, pipefitters, oilers, electricians, millwrights, etc.
The old welder that taught me my welding ability (will not exactly call them skills) would always do it on swing or graveyard shift.
He was a total alcoholic, his thermos was always filled with vodka. He was the best welder in the department though.
The funny thing about this old guy was that his hands shook all the time until he flipped his helmet down to start his weld.
Once his hood was down, his hands went rock steady but his head would start shaking side to side. He would raise his helmet and his hands would start shaking.
I learned a lot about welding from this old guy.
In the early 80's they combined the crafts into one job description with the exception of the electricians. I'm glad I had a chance to learn from that old welder!