Tig-brazing white alloy filler quest - will this work?

Question

Metal name: Braze 655Typical Applications: For brazing Invar, Kovar and similar alloys tocopper in vacuum tubes; as jet engine rubbing seals.Solidus: 1385'F/750'CLiquidus: 1560'F/850'CMax. Recom. Brazing Temp. 'F: 1700Nominal Composition,%: 65Ag 28Cu 5Mn 2NiJoint Color as Brazed: WhiteDensity Troy oz/cu in: 5.20Electrical Characteristics    * Conduct. % IACS: 12.8    * Resistivity microhm-cm: 13.4I know from reading Ernie's posts Silicon Bronze is recommended (notthe low fuming kind)

treebeard · Accepted Answer

(tig-brazing stainless steel 316L  , would the following filler work?)(forgot to say what I would be brazing)

lionslair at consolidated dot · Answer

Why not use 316L SS wire as filler ?Martin

Ernie Leimkuhler · Answer

Interesting stuff.Might be worth trying

treebeard · Answer

>Thanks for the feedback.  If I learn to tig braze-weld and ever trythe braze 655, I'll post the results here.  If I decide to learn tigwelding and braze-welding, it'll long after the summer is over.  Goodwishes to all!

treebeard · Answer

If you do a google group search on tig braze-welding, you'll find the details. TIG-Braze Welding - Chapter 3 would be a good thing to search for (sci.engr.joining.welding newsgroup), but there are a lot of messages about tig braze-welding.

Using 316L ss wire as filler would be regular welding, and the base metal would melt or be distorted.

Using the silicon bronze, which has a lower liquidus point, the base

316L ss would not be melted or heat distorted very much, depending on the amount of heat applied. The result would be a "braze weld" or whatever you want to call it - I don't want to get in semantics argument.

316L physical properties: Physical Data

Electrical Resistivity (microhm-cm (at 68 Deg F)) 444

Melting Point (Deg F) 2550

Modulus of Elasticity Tension 28

For what I plan to do, considering my non-skill level, brazing with oxy-acet and the Meco torch and the appropriate filler is a probaly the way for me to go, from what I've learned from the folks in this newsgroup. But, tig has been mentioned as a good alternative and....so I've been reading.

Tim Williams · Answer

Oh! I just remembered something I did a while ago. I needed to stick a bunch of nickels (25% Ni, 75% Cu) together, with a similar metal. Not brass. So I grabbed a length of copper wire and some gouging rods (for carbon arc) and non-TIG-braze-welded them together. Doesn't work that bad, just needs some control over oxidation.

Tim

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Tig-brazing white alloy filler quest - will this work?

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