After some closer inspection, I believe you would clamp your stick welder rod holding jaws onto the knurled bit. There is some evidence of arcing there.
I cant imagine being able to make a very nice weld with this. Functional, sure.... pretty? Ehhh...
Cant figure the tire valve thingermajiggerwob on there, less it was just to plug that hole in the regulator, making a plug with what was on hand.
Kinda of
like this setup, but a bit more "crude".