> I have always understood that welding (or attempting) cast
> iron is a waste
> of time as the expansion rate of the metal is significantly
> different than the
> repair and it will only crack again.
Which is why all the mucking about with special rods (to get the expansion
rate) and pre-heating/post-slow-cooling (to minimize resulting stress in the
weld). I have seen a manifold that was successfully welded, but the guy
that did it was an expert in cast-iron welding, not just some local "weld
anything to anything" shop.
And it wasn't a manifold you could buy for $50 used.
Randall
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