Re: exhaust pipe welding

Posted by george md on April 02, 2007 at 09:47:51 from (12.177.53.105):

In Reply to: Re: exhaust pipe welding posted by steve n carol on April 02, 2007 at 07:52:51:

Steve,

I make the pieces that I use for repair
out of cast iron , if you use steel you will
have the same problem that you have with nickel
rod . The rate of expansion of most anything
but cast is so much greater than cast that most
times the job will crack before it is cool.

On cast iron , use o/a torch ,cast iron rod
with proper flux, and much preheat . It's best
to build an oven ( stack fire brick around to
form an oven ) leaving ports thru which you
can apply heat with large propane torch as in
weed burner .Heat to red glow then weld and
you may have to reheat many times as you weld
to keep the temp near 1200 deg F , do a post
heat of near 1500 and hold for 15 minutes then
close up the ports in the oven cover with more
brick and finally cover the brick with asbestos
blanket. Do it late at nite , go home when
done , uncover it in the morning as it should
be cool by then.

And yes those are jobs in my shop , I do quite
a lot of cast repair , much of which is rusted
out or burned out manifolds. Broken ones are
much easier to fix.

george

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