[TheForge] tig welding problems

[Ralph Sproul]

        Ben, Some pipe has some impurities in it, so those may be coming to
the surface especially if it's that coated pipe.  The other thing is back
gassing might help so the air in the pipe doesnt' affect the weld.  The
third thing which I hope your not doing with the gas set that high is
holding the tig nozzle at to much of an angle and actually sucking in air
with a venturi effect from behind the nozzle.  Those are the three things
that would come to mind on pipe.
        The flow meter at 30-50 seems high,(but your saying it's a CO2 and
not an argon flow meter) - as I run an argon flow meter at only 8-15.  Not
really sure how much difference there is in CO2 vs Argon on the flow values
without looking up a chart, but that seems pretty high(might be causing you
to draw air in?).

Ralph


----- Original Message -----
From: <Loktr at aol.com>
To: <theforge at mailman.qth.net>
Sent: Saturday, August 14, 2004 5:24 PM
Subject: [TheForge] tig welding problems


> I am tig welding schedule 80 black  pipe.  The argon is set on 30 to 50 on
a
> Co2 flow valve. Straight polarity, high freq start.  I am using a gas
> concentrator nozzle with .125 electrode and 3/32 steel for tig filler rod.
Every now
> and then I will get a gas bubble in the metal, when I try to reheat the
area
> to float the bubble out it seems like it moves around and I can never get
it
> out.  What am I doing wrong?  By the way the steel is wire brushed as well
as
> the forged steel fittings.
>
> Ben
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