re. Exhaust manifold welding tips + ceramic coating

[Aaron Gibson]

I had a local welding shop fix my cracks and they used a nickle welding rod.
They also would weld a small bead and let it cool and then weld more etc etc
etc. Its holding up very well so I guess nickle rod is the way to go.
----- Original Message -----
From: "Ben Swann" <bswann at worldnet.att.net>
To: <antar at attbi.com>
Cc: <quattro at audifans.com>
Sent: Friday, September 06, 2002 12:54 PM
Subject: re. Exhaust manifold welding tips + ceramic coating


> I'd be interested to know what you find as I have 2 manifolds here with
tiny cracks.
>
> I was tempted to try brazing as that may allow for some flex.
>
> My understanding was however that if you weld it, then it needs to be
planed so that all of the runners are flush.
>
> Ben
>
>
> [Even though I'm probably going to trash my manifold, I tried to weld up
the
> cracks in it today. I was using a cheap 120A gasless MIG welder, but I
> would notice that eventually that the cracks came back in the same spot.
> What's surprising too, is the place where the metail cracked is actually
> pretty thick. The crack must be very deep for WD-40 to spray out. Also
when
> I let the metal cool after welding, I hear this clicking noise from it. Am
> I welding this wrong, or are these manifolds really no hope? I see some
> repaired manifolds at Dad's and such..are these worth it, or will these
> crack soon too? Would a ceramic coating protect it from high heat and
> cracking again? Thanks.
>
> -ameer]
>