[s-cars] high flow race cats?

[Trevor Frank]

Steve there are lot's of things that can go on, Carbide precipitation
actually this is what we are talking about often when you say that the
stainless weld is rusting.  Basically you end up with very low chromium
content next to the grain boundries, one reason again why 321 is good to
use is that it has titanium that has a higher affinity for carbon then
does chromium and thus the chromium content isn't reduced.  Columbium is
in the 347 welding rod you use for welding 321 and has the same effect
as the titanium, titanium isn't used in the welding rods since it's
typically lost in the arc.  Oh and the melting point of the tungsten rod
in a tig welder is approx 5200F...so you can do a lot of damage
to...well almost anything.  A gas rig inner flame is around 6300...oh
and our favorite plama cutters are nearly 20,000f, can someone say
vaporization point.

Trevor, ME, Welder and Materials Engineering background.

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of Steve Powers
Sent: Tuesday, September 13, 2005 12:39 PM
To: surlyq at gmail.com
Cc: s-car-list
Subject: Re: [s-cars] high flow race cats?

Brian -

> ive also learned that you are able to mig weld stainless but that it
changes
> the chemical composition of the metal and is (as from the general
> description) no longer 'stainless' steel....

I'd probably question that. Welded at the proper temperature under an
inert environment one would be hard-pressed to create any chemical
reaction much less a reaction which changes the composition.

now if one were talking about changes in the lattice structure I might
be inclined to listen.

Steve Powers
an EE and welder, not a metallurgist
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