> obviously you have never seen a manifold on a > working tractor at night. they get chrry red.
I have. Some get hot enough to show red in the dark but not in daylight or twilight. That"s about 400C. Brazing alloys don"t melt below 840C. That"s red in sunlight.
> there is special welding rod for > manifolds.
You can"t weld without melting the workpiece. I can"t see how that is not going to result in the formation of a band of white iron (and indeed what most welders have been telling me is "I can try to weld it with nickel rod. Sometimes it works, sometimes it doesn"t".)
> brazing on exhuast is not recommended.
I wouldn"t braze the exhaust headers on a race car, but then they aren"t likely to be cast iron.
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