BVAu-3 Technical Data
The most common use of BAu-3 is for step brazing with BAu-1 & BAu-2. BAu-3 has excellent wetting to Ni, Mo, SS, Kovar and Mo-Mn with minimal diffusion. Also used for high-integrity joints in aerospace and automotive applications, vacuum tubes, wave guide and Klystron assemblies and power surge arrestors. BAu-3 is often brazed under partial pressure due to the high vapor pressure of copper.
BVAu-2 is generally used in reducing, vacuum, or inert atmosphere. It is a less ductile alloy than standard gold-copper-nickel alloys. The composition of the alloy allows for use in applications where braze filler metals low in volatile constituents are required. Due to its eutectic nature GB8020 exhibits free flowing characteristics.
Properties of Brazed Joints
The properties of a brazed joint are dependent upon the base metal, joint design and brazing technique. For atmospheric brazing the recommended radial joint clearance for gold base alloys fall within .0015-.002” range.
GB356523 alloy conforms to: Unified Numbering System (UNS) P00351 and American Welding Society (AWS) A5.8/A5.8M BVAu-3 Grade 1 and Grade 2.
Strip, wire, powder, and preforms to specifications.
- AWS: BVAu-3
- Brazing Temperature Range High: 1950 F / 1066 C
- Brazing Temperature Range Low: 1900 F / 1038 C
- Liquidus: 1850 F / 1010 C
- Solidus: 1814 F / 990 C
- Cu: 62%
- Au: 35%
- Ni: 3%
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