----- Original Message -----
From: "John T. Blair" <jblair@exis.net>
To: <Spitfires@autox.team.net>
Sent: Monday, June 16, 2003 12:06 AM
Subject: Re: Exhaust manifold - welds vs epoxy?
> As to welding the manifold. I'm no welder, but talking with many car
buddies
> at work, most manifold are cast iron. If so, they have to be handled a
> special way, you just can't start welding on it. I'm not sure about all
> the particulars, but one thing I seem to remember is that you had to
preheat
> the part before you can weld it.
I know next-to-nothing about welding but from what little I *do* know:
wire-feed welders need different wires for different metals. I have a small
rig equipped for welding mild steel. I would need different wire to weld
aluminium. Looking at http://www.daytonamig.com/consuma.htm there is no
mention of cast iron, so that means you can either weld it with steel wire
or you can't weld it :-) The "preheating" idea doesn't ring true for me WRT
MIG welding, since MIG uses a high electrical current to cause a reaction
between the wire and the piece. I can imagine it's true for gas welding,
simply because a large heavy cast piece will act like a heatsink and make it
hard to get the working area up to temp.
Hope that's useful, though not definitive!
Steve
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