Re: [DMCForum] Repairing the evaporator
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Re: [DMCForum] Repairing the evaporator

Helium and heli-arc really aren't used that much any more if at all.  I
would say 99% of the shops use TIG or GTAW (Gas Tungsten Arc Welding) which
uses a tungsten electrode and 100% pure Argon shielding gas.  With a TIG you
can weld mild steel, SS, Al, and I have been told Cu however I have not
tried yet.


----- Original Message -----
From: "Dave Stragand" <dave.stragand@xxxxxxxxxxxxxxx>
To: <DMCForum@xxxxxxxxxxxxxxx>
Sent: Tuesday, April 27, 2004 10:51 PM
Subject: RE: [DMCForum] Repairing the evaporator

Aluminum will not weld correctly in an oxygen-rich environment.  It will
oxidize... that's why they use the helium in the welding.

-----Original Message-----
From: Andrei Cular [mailto:andreic@xxxxxxxxxxxxxxxxxx]
Sent: Tuesday, April 27, 2004 9:56 PM
To: DMCForum@xxxxxxxxxxxxxxx
Subject: Re: [DMCForum] Repairing the evaporator

> I have soldered aluminum before, but I'd want a lot of
> practice before soldering something like that.  You can't
> see how hot it's getting, and the melting point of the
> solder is just under that of aluminum.  Get it too hot, and
> all of it turns liquid.  I suggest finding an experienced
> a/c guy to do it.

I got a TIG but not being a part on my car I would be really hesitant to try
it.  However I do have a friend in Tampa that would probably do it for a
case of Guinness.



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