On Wed, 2 Jan 2008 06:40:47 -0800 (PST), "
wrote:

On Jan 1, 9:54 pm, Richard Riley wrote:


If brazing gives stronger joints that normalized 4130, why aren't we
brazing airframes?

(I'm not saying it's an incorrect statement - I know better than to
disagree with VD on something like this. I just figure there must be
a reason, like the brazing compounds are more expensive.)
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Dear Richard,

That's a good question but you're asking the wrong guy.

Also, it isn't just ANY brazing, it is a form of eutectic brazing
developed specifically for alloy steels, initially for use in military
weapon systems as a means of reducing the cost & weight of certain
structures. The components are cut very accurately on CNC equipment
and most of the joins were done in an oven with the parts secured in a
jig.

The only problem I can see with this method is that REPAIRS would be
rather difficult; certainly not as convenient as with an O/A torch and
wire coat hanger :-)

Dig through French's books. If he hasn't written something about it,
he should have.

-R.S.Hoover


You are referring to "furnace brazing" which is different than "fillet
brazing" (also known as braze welding)

see: http://www.henryjames.com/gasf.html
I believe they are generally a nickel silver braze.

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