The gas is not flammable, so a small leak is pretty much irrelevant, unless you
leave everything turned on for hours at a time.
On mine, I never purge after closing the main valve. Why bother? The pressure
is only a few pounds.
One thing I do before welding is unclamp the wire feed and press the trigger
for a few seconds, to make sure that the main hose gets all the air purged from
it. You can double check that you are getting gas by sniffing the nozzle: The
CO2 should make it smell like soda water.
Doug
--- On Sun, 1/25/09, Jim Stone <jandkstone99@msn.com> wrote:
> From: Jim Stone <jandkstone99@msn.com>
> Subject: [Shop-talk] Basic MIG Welding questions
> To: shop-talk@autox.team.net
> Date: Sunday, January 25, 2009, 10:00 PM
> I finally had a chance to use my MIG (Hobart 140) with
> CO2/Argon shielding
> gas. My initial welds were pretty poor, but I got better
> as I went along and
> the lessons from my welding class came back to me.
> However, I have two
> questions about using it with the shielding gas. First, I
> was surprised that
> the instructions didn't call for any thread sealer on
> the gas connections, nor
> for any testing for leaks (e.g., soapy water). Is this
> correct? Don't I need
> to worry about this?
>
> My second question is pretty simple: When I am through for
> the night, is it
> necessary to purge the line after shutting off the gas
> cylinder? Or can I just
> leave it alone and let it leak out slowly over time?
>
> Thanks.
>
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