AWS BVAg-30 (P07687) Vacuum Service Filler Metal
AWS BVAg-30 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BVAg-30 is the AWS designation for this material. P07687 is the UNS number.
It has a moderately high density and a fairly high melting temperature among silver-based braze fillers.
The graph bars on the material properties cards below compare AWS BVAg-30 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
810 to 930 °C 1490 to 1700 °F
Latent Heat of Fusion
140 J/g
Melting Completion (Liquidus)
810 °C 1490 °F
Melting Onset (Solidus)
810 °C 1480 °F
Specific Heat Capacity
280 J/kg-K 0.066 BTU/lb-°F
Thermal Expansion
19 µm/m-K
Other Material Properties
Density
10 g/cm3 630 lb/ft3
Elastic (Young's, Tensile) Modulus
86 GPa 12 x 106 psi
Poisson's Ratio
0.36
Shear Modulus
31 GPa 4.6 x 106 psi
Tensile Strength: Ultimate (UTS)
170 MPa 25 x 103 psi
Common Calculations
Stiffness to Weight: Axial
4.7 points
Stiffness to Weight: Bending
14 points
Strength to Weight: Axial
4.7 points
Strength to Weight: Bending
6.7 points
Thermal Shock Resistance
7.6 points
Alloy Composition
| Ag | 67 to 69 | |
| Cu | 25.5 to 28.5 | |
| Pd | 4.5 to 5.5 | |
| 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