Probably the governor on our projects was the fact that welding gasses have always been expensive, and we were too young to buy them.

Pinch a couple balloons worth off the old mans torch tanks ? That would work, but, filling a 55 gallon bag with the stuff would have gotten us busted.

Or, killed. The percussion from a good sized balloon going off is fearsome. 55 gallons? BATF would be there.

Best,
Ted