"Chris Wilson" wrote: (clip) I would like to directly weld a flexible
stainless steel bellows to a cast iron manifold (clip)
^^^^^^^^^^^^^
There are people better qualified than I am to answer this, but, anyway,
here goes. Cast iron can be welded using nickel rod. Cast iron can be
welded to carbon steel with nickel rod. Stainless rod is sometimes used to
weld cast iron, since it is high in nickel. So, logically, stainless should
be weldable to cast iron using nickel rod.