On Fri, 19 Jun 2015 10:19:31 -0700, "Paul Hovnanian P.E."
wrote:

Specifically 70-30 cupronickel. Any links or advice on machining and/or
brazing this stuff? Ususlly used in marine (salt water) plumbing and heat
exchangers.

I've seen a number of marine heat exchangers, said to be cupronickel,
that had the end plates soldered on but I am not sure whether it was
lead-tin solder or silver solder, but I did visit a shop that was
making them and the assembly was being done with an acetylene torch.

You might look at:
http://www.copperalliance.org.uk/doc...cation-pdf.pdf
https://books.google.co.th/books?id=...angers&f=false
http://www.nickelinstitute.org/~/Med...ns_1200 7_.pd
For more detail.
--
cheers,

John B.