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Brass brazing

 
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PostPosted: Tue Jan 02, 2007 2:00 pm    Post subject: Brass brazing Reply with quote

I have several 3/8" brass rods and I want to braze them together to
make a square after I cut and fit the ends together for a tight fit and
this would be for look only and not for anything structual. Can I use a
small brass rod like a 1/16" inch to braze them with Mapp gas or do I
need to buy a specific brazing rod from the welding supply shop and can
I use Mapp gas or do I have to have more heat? I also read that I can
use silver solder but I really wanted to stay with all brass so I can
polish it up. if I had to use silver solder, is there a specific type I
need and do I use flux just like normal soldering. Any help with all my
questions would be appreciated or a link to this subject would be
appreciated also.
Thanks,
Mike
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PostPosted: Tue Jan 02, 2007 2:00 pm    Post subject: Re: Brass brazing Reply with quote

mdfranci@airmail.net wrote:
Quote:
I have several 3/8" brass rods and I want to braze them together to
make a square after I cut and fit the ends together for a tight fit and
this would be for look only and not for anything structual. Can I use a
small brass rod like a 1/16" inch to braze them with Mapp gas or do I
need to buy a specific brazing rod from the welding supply shop and can
I use Mapp gas or do I have to have more heat? I also read that I can
use silver solder but I really wanted to stay with all brass so I can
polish it up. if I had to use silver solder, is there a specific type I
need and do I use flux just like normal soldering. Any help with all my
questions would be appreciated or a link to this subject would be
appreciated also.

You will have a very hard time using ordinary brass rod as a brazing
material - it is not designed to melt and flow cleanly.

Silver soldering would be a good idea, and you can do it with MAPP or
even propane, but your workpieces are thick enough that you will need a
burner that can put out a lot of heat. The 56% silver alloy is fairly
easy to work with. You will need a paste type brazing flux (white is
okay at that temperature).

Yes, the color will not match. But you will mechancially fit the joint
very well, then then only a tiny bit of the silver solder will be used.
You can file/sand and then polish away the excess, so that all that
remains is the silver actually in the joint itself, which should be
just a hairline. If you really want a color match, go for an alloy
with more copper and less silver - but this will require a higher
temperature.

However the easiest solution would be to use a soft solder ("normal
solder") with liquid flux. For example, the sta-brite kit that you can
buy of solder and flux. Again, the color won't match, but you will
clean away all the excess solder so that won't matter very much.
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