Anonymous-0
Well-known Member
The texhaust manifold on my VAC Case is cracked, but still intact. Can cast-iron manifolds be successfully brazed?
Thanks,
Glenn F.
Thanks,
Glenn F.
- Thread starter Anonymous-0
- Start date
I've used this on the rear end of my New Holland about 3 years ago. It's still holding fine. Highly recommend it.
P.S.. No affiliation with them
Lok n Stitch
P.S.. No affiliation with them
Lok n Stitch
In a College Welding class they told us don't braze stuff that gets hot, like exhaust manifolds, the heat/cool cycles tends to cause the repair to fail. That being said yes I've done it,did it before I knew better, it never lasted all that long. I always figured it was a lack of skill on my part. It can be done, how long it last varies.
Bill in IN
Member
Preheat would be a definite. Welding will build in enough stresses even then....
Your best bet would be to follow george md's advise. I have arc welded cast with nickel rod and I have brazed cast with success. After seeing george md's work I would highly recommend oxygen/acetylene welding cast.
Years ago a welding supply would break a box and sell you welding rods by the pound. When I asked about cast rod it only came in fifty pound boxes at eight dollars a pound and they would not break a box. I would think at that price they would package it in smaller containers. I have not found any yet packaged smaller but have not looked real hard. I have a small cast job on hold until I find some maybe 1/8 cast rod.
Years ago a welding supply would break a box and sell you welding rods by the pound. When I asked about cast rod it only came in fifty pound boxes at eight dollars a pound and they would not break a box. I would think at that price they would package it in smaller containers. I have not found any yet packaged smaller but have not looked real hard. I have a small cast job on hold until I find some maybe 1/8 cast rod.
Just curious- when you weld manifold parts together, do you bolt them solid on a steel plate to maintain alignment......then unbolt before/after they cool? I understand the need for slow cooling- my local welder often cools cast parts by wrapping in fiberglas insulation overnight.
JMS,
I usually tack them while clamped down, but
unless you have a large flat casting that you
can put in the oven,it won't work. If you use
steel the rate of expansion will most likely
crack the manifold during cool down. With
preheat at 1000 to 1200 deg in the oven , all
the expansion is done and you can weld without
warping.
Email if you want to chat about it.
george
<p align="center">
oven with 2 propane burners to heat
casting to 1200 deg F to weld</p>
I usually tack them while clamped down, but
unless you have a large flat casting that you
can put in the oven,it won't work. If you use
steel the rate of expansion will most likely
crack the manifold during cool down. With
preheat at 1000 to 1200 deg in the oven , all
the expansion is done and you can weld without
warping.
Email if you want to chat about it.
george
<p align="center">
oven with 2 propane burners to heat
casting to 1200 deg F to weld</p>
buickanddeere
Well-known Member
Any repair of an old used corroded and heat stressed manifold is temporary. You can mess with the old manifold or replace it.
Anonymous-0
Well-known Member
I think you're right BD. If this were a rare manifold I'd really have to give welding a try.
Glenn
Glenn
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