Tom,
This is just a guess but I think the straight argon problem exists with MIG
only. You normally use a 25/75% mix with ferrous metals and MIG and straight
argon only with aluminum. I was taught to use straight argon with a TIG no
matter what you were welding.
Howard
-- Original Message -----
From: "Tom Neimeyer" <3cbxs@ev1.net>
To: "Joe Timney" <joetimney@dol.net>
Cc: "List Land Speed" <land-speed@autox.team.net>
Sent: Tuesday, January 16, 2001 9:52 AM
Subject: Welding & Penatration
> Joe,
> I'm very curious on why you say this about argon. I have welded and
seen
> welded miles and miles of pipe in numerous refinerys and it was, and still
> is done with argon. In the helirc (TIG) welding class I took it never
> mentioned the lack of penetration caused by argon vs CO2? Please
elaborate
> on how a shield gas can effect penetration. I do understand how failure
to
> have shielding gas on the back side of the weld can cause the weld to
> "sugar" which in turn can effect weld strength.
>
> Now to get into a penatrating discussion....With TIG or MIG, to achieve
good
> penatration the pieces being joined should be spaced slightly apart. This
> "space" or "gap" allows the heat source to melt the inner edge of the
pieces
> being joined into the weld "puddle" creating 100% penatration. Although
it
> is possible, on thinner metals, to melt the metal pieces together without
a
> gap or filler material being used. If anybody has some time on a rainy
day,
> set up 2 sets of test "coupons" of 1/16 metal, using TIG. Set up one set
> butted together and weld them and the other with a 1/32-3/64 gap and weld
> them using filler rod as needed. I think you might be suprised at the
> outcome.
>
> I have also had the opportunity to observe weld testing. Mostly pipeline
> welds where they do a root bent, face bend and nick break. It is amazing
to
> see how much stress a weld can endure.
>
> Disclaimer: I learned this all from Keith,
> throw something out to the list and wait to get blasted....(:0
>
> Regards, Tom
>
> ----- Original Message -----
> From: "Joe Timney" <joetimney@dol.net>
> To: "Henry Deaton" <hdeaton@verio.com>
> Cc: "List Land Speed" <land-speed@autox.team.net>
> Sent: Tuesday, January 16, 2001 3:18 AM
> Subject: Re: Motorcycle front-end Geometry
>
>
> > Henry,
> >
> > Don't use straight argon on steel...it will look great and WILL BREAK.
The
> > problem is no penatration. Use a mix or straight CO2.
> >
> > joe
> >
> > Henry Deaton wrote:
> >
> > > Hi Dan,
> > >
> > > Well, so far I like your interpretation of the electric class rules
the
> > > best. The class is already there and all I have to do is finish
building
> > > the darn thing and show up with it. This is great. I was sure I'd just
> be
> > > running for time this year.
> > >
> > > BTW, I've been practicing on my welding by building kick-scooters out
of
> > > kid's bicycles. I'm using a friend's mig, but with flux-core wire.
He's
> got
> > > the gas setup for aluminum right now with a bottle of 100% Argon.
> Anybody
> > > know if you can mig weld mild steel using 100% argon instead of CO2 or
> an
> > > Argon/CO2 mix? If not I'll get him a bottle of CO2 and some solid wire
> > > before I start the bike frame.
> > >
> > > Henry
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