AWS BVPd-1 (P03657) Vacuum Service Filler Metal
AWS BVPd-1 is a precious metal alloy formulated for use in electrical contacts. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BVPd-1 is the AWS designation for this material. P03657 is the UNS number.
It has the highest heat capacity and a moderately low tensile strength among precious metal electrical contact alloys.
The graph bars on the material properties cards below compare AWS BVPd-1 to: precious metal electrical contact alloys (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
1240 to 1250 °C 2260 to 2290 °F
Latent Heat of Fusion
200 J/g
Melting Completion (Liquidus)
1240 °C 2260 °F
Melting Onset (Solidus)
1230 °C 2250 °F
Specific Heat Capacity
310 J/kg-K 0.073 BTU/lb-°F
Thermal Expansion
12 µm/m-K
Other Material Properties
Density
11 g/cm3 680 lb/ft3
Elastic (Young's, Tensile) Modulus
150 GPa 22 x 106 psi
Poisson's Ratio
0.37
Shear Modulus
56 GPa 8.1 x 106 psi
Tensile Strength: Ultimate (UTS)
240 MPa 35 x 103 psi
Common Calculations
Stiffness to Weight: Axial
7.7 points
Stiffness to Weight: Bending
16 points
Strength to Weight: Axial
6.1 points
Strength to Weight: Bending
7.9 points
Thermal Shock Resistance
9.8 points
Alloy Composition
| Pd | 64 to 66 | |
| Co | 33.9 to 36 | |
| Ni | 0 to 0.060 | |
| 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
Further Reading
AWS A5.8: Specification for Filler Metals for Brazing and Braze Welding