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Join Date: Jan 2009
Location: Northeast
Posts: 21
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Autogenuously Joining Leaded Red Brass

11/24/2009 8:11 AM

What is the best process to autogenuous join cast leaded red brass components? The leaded red brass composition is 85% Copper -5% Tin 5% Zinc 5% Lead.

I want the castings joined with no or very minimal compositional changes at the joints. A patina will be applied afterward and compositional changes will result in differences in the patina in the finished sculpture. Defects or holes in the castings also need to be repaired in a few spots. The castings are part of a sculpture, so minimal or no weld bead is desirable.

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Power-User
Hobbies - Car Customizing - New Member

Join Date: Dec 2008
Posts: 118
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#1

Re: Autogenuously Joining Leaded Red Brass

11/24/2009 11:06 PM

Red Brasses

Principal Type

Gilding Metal, Commercial Bronze, Jewelry Bronze, Red Brass

Principal Use

Jewelry, marine hardware, heat exchangers, grille work, fire extinguisher cases

Recommended Brazing Filler Metals*

Cadmium Free Alloys: Sil-Fos & Fos-Flo Series, Braze 560, 380, 452 and 402 Cadmium Alloys: Easy-Flo, Easy-Flo 35 and Easy-Flo 45

Recommended Fluxes**

Handy Flux or Handy Flux Type LT

Recommended Atmospheres Type - Maximum Dew Point

Purified, Lean Exogas

- +10°F/-12°C, Reacted Endogas - +10°F/-12°C, Dissociated Ammonia - +20°F/-6.7°C

Remarks

In furnace brazing, flux may be used with the atmosphere for food "wetting" by the brazing alloy.

http://www.handyharmancanada.com/TheBrazingBook/Section%203/Part%2012.htm

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Guru
Hobbies - DIY Welding - New Member

Join Date: Sep 2007
Posts: 1601
Good Answers: 57
#2

Re: Autogenuously Joining Leaded Red Brass

11/25/2009 8:01 AM

It depends on the fit-up between your castings as well as their size. If they have a precision (machined) fit, you may consider friction-stir welding, electron beam welding, laser welding, or even some form of arc welding. If fit-up is poor, you will be forced to use a filler metal. The color match will be a function of microstructure as well as composition of the filler metal.

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