AWS BVAg-32 (P07547) Vacuum Service Filler Metal
AWS BVAg-32 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BVAg-32 is the AWS designation for this material. P07547 is the UNS number.
It has a moderately high tensile strength among silver-based braze fillers. In addition, it has a very high melting temperature and a fairly low heat capacity.
The graph bars on the material properties cards below compare AWS BVAg-32 to: silver-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
950 to 980 °C 1740 to 1800 °F
Latent Heat of Fusion
140 J/g
Melting Completion (Liquidus)
950 °C 1740 °F
Melting Onset (Solidus)
900 °C 1650 °F
Specific Heat Capacity
270 J/kg-K 0.064 BTU/lb-°F
Thermal Expansion
17 µm/m-K
Other Material Properties
Density
11 g/cm3 660 lb/ft3
Elastic (Young's, Tensile) Modulus
93 GPa 13 x 106 psi
Poisson's Ratio
0.37
Shear Modulus
34 GPa 4.9 x 106 psi
Tensile Strength: Ultimate (UTS)
180 MPa 26 x 103 psi
Common Calculations
Stiffness to Weight: Axial
4.9 points
Stiffness to Weight: Bending
14 points
Strength to Weight: Axial
4.7 points
Strength to Weight: Bending
6.7 points
Thermal Shock Resistance
8.0 points
Alloy Composition
| Ag | 53 to 55 | |
| Pd | 23 to 27 | |
| Cu | 20 to 22 | |
| C | 0 to 0.0050 | |
| P | 0 to 0.0020 | |
| Pb | 0 to 0.0020 | |
| Zn | 0 to 0.0010 | |
| Cd | 0 to 0.0010 |
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