Copper Furnace Brazing
Copper Furnace Brazing
(OP)
I have a copper flange and copper shaft furnace braze project with Boron Nickel filler metal to be performed in vacuum furnace. Problem: the alloy is C18150 - chromium zirconium copper which is not oxygen free. How to braze and avoid oxygen coming out during braze and joint not brazing. Is there a plating suggestion or flux that could be used to avoid the oxygen affecting the brazeability?





RE: Copper Furnace Brazing
How are you preping the surfaces prior to brazing? I would degrease followed by a activation/acid-dip to remove the surface oxide films. In the brazing furnace back-fill a N2/H2 (3-5% H2) reducing atmosphere several times. During the brazing process, the copper should remain bright.
MH
http://www.linkedin.com/pub/luke-autry/1b/510/566
RE: Copper Furnace Brazing
The idea of using a partial H backfill is a good way to go.
Have you thought about doing this in hydrogen instead of vacuum?
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Plymouth Tube
RE: Copper Furnace Brazing
RE: Copper Furnace Brazing
RE: Copper Furnace Brazing
All the above are excellent suggestions.
"How are the edges being prepped. " metal head"
are the edges machined ? are the outer oxides being removed to obtain good bonding.
cleaning as suggested is also very important as mentioned before.
any acid dip ?
Mfgenggear