re. Exhaust manifold welding tips + ceramic coating

[Peter Berrevoets]

Martin Pajak welded my manifold up for me about six or seven months ago and
it is still holding up fine.

On the first attempt to do a mig weld, we were getting a very unsatisfactory
looking weld so we used a barbecue to heat the manifold prior to welding. On
the second try with the heated manifold, the weld was excellent and flowed
smoothly from new material to original casting with an almost imperceptable
change in appearance. It turned out looking 'picture perfect' and has held
up much better than my head gasket (blown twice now) on this engine.

Perhaps the uniform pre-heating of the manifold is the way to go on this
kind of repair.

My $0.02 cdn.

Cheers!

Peter
1990 200Q MC2
1989 200Q MC1 parts
1987 Coupe GT 2.3

> -----Original Message-----
> From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
> Behalf Of Aaron Gibson
> Sent: Friday, September 06, 2002 2:49 PM
> To: bswann at worldnet.att.net; antar at attbi.com
> Cc: quattro at audifans.com
> Subject: Re: re. Exhaust manifold welding tips + ceramic coating
>
>
> 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]
> >
>
>