Dear Leon,

Gasoline 'burners' have been around since the late 1800. I think they
need pure oxygen to generate a flame that is SMALL ENOUGH for a task
as intricate as welding thin-wall, small diameter steel tubing.
Unfortunately, the gas generator has a habit of exploding as the
volume of gasoline falls and the amount of the tar-like residues
increases. I don't know why this is so, I'm going on information
heard when I was a kid. That is: gasoline 'burners' are bad whereas
oxy/acetylene are good.

Personally, if I were stuck in a Third World Country and had only a
gasoline burner to weld with, I'd probably try it... but there are a
lot of other methods I'd try first.

-R.S.Hoover