I have never worried about getting a perfect seal on any of the fittings as
I did not think there was much pressure in the line. After all there is this
big hole at the end of the gun so ...
I have always just shut the cylinder valve when I was done and let it go at
that. I've been more worried about what might leak INTO the lines after I
shut it off and left it sit until the next weekend than what the gas that
was suppose to be in there did to the plumbing while it was sitting. That is
why I usually turn the wire speed down as low as it will go and pull the
trigger a few times if it has set unused for a few days. This allows the
preflow to purge the air or what ever might have gotten in there while it
was sitting unused out and I am sure to get good shielding gas right at the
start.
Arvid
----- Original Message -----
From: "Jim Stone" <jandkstone99@msn.com>
To: <shop-talk@autox.team.net>
Sent: Sunday, January 25, 2009 9:00 PM
Subject: [Shop-talk] Basic MIG Welding questions
>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
> thate
> 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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