AWS BAu-2 (P00800) Filler Metal
AWS BAu-2 is a gold-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAu-2 is the AWS designation for this material. P00800 is the UNS number.
It has a fairly low melting temperature among gold-based braze fillers. In addition, it has a moderately low heat capacity and a moderately low tensile strength.
The graph bars on the material properties cards below compare AWS BAu-2 to: gold-based braze fillers (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Thermal Properties
Brazing Temperature
890 to 1010 °C 1640 to 1850 °F
Latent Heat of Fusion
92 J/g
Melting Completion (Liquidus)
890 °C 1640 °F
Melting Onset (Solidus)
890 °C 1640 °F
Specific Heat Capacity
180 J/kg-K 0.043 BTU/lb-°F
Thermal Expansion
15 µm/m-K
Other Material Properties
Density
17 g/cm3 1080 lb/ft3
Elastic (Young's, Tensile) Modulus
100 GPa 15 x 106 psi
Poisson's Ratio
0.4
Shear Modulus
36 GPa 5.3 x 106 psi
Tensile Strength: Ultimate (UTS)
150 MPa 22 x 103 psi
Common Calculations
Stiffness to Weight: Axial
3.3 points
Stiffness to Weight: Bending
9.1 points
Strength to Weight: Axial
2.4 points
Strength to Weight: Bending
3.6 points
Thermal Shock Resistance
7.1 points
Alloy Composition
| Au | 79.5 to 80.5 | |
| Cu | 19.4 to 20.5 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
AWS A5.8: Specification for Filler Metals for Brazing and Braze Welding