The welding books I have read suggested about 10 liters/minute for the gas
flow. There are 28.3 liters in one cubic foot. So a 20 cu ft gas cylinder
should last for about an hour of welding.
Now, how long it will take you to do an hour of welding, I cannot say.
Could be anywhere from a couple of days to a couple of years.
I've forgotten my cylinder's size, but it is 26" from the base to the top of
the valve handle. (It's probably 40 cu ft.) I last filled it 5 years ago, and
it is almost empty now. During that time I have done a bunch of small
projects, including all the sheet metal repairs on my '31 Ford (see
31ford.dougbraun.com).
Doug
--- On Thu, 12/4/08, Jim Stone <jandkstone99@msn.com> wrote:
> How long does 20 cu ft of shielding gas last? Given the
> minimal cost
> difference between 20 and 40 cu feet of my primary
> shielding gas (I have no
> idea what they get for other mixes), am I stupid to even
> question this?
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