AWS BAg-8 (P07720) Filler Metal
AWS BAg-8 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-8 is the AWS designation for this material. P07720 is the UNS number.
It has a moderately high density among silver-based braze fillers. In addition, it has a moderately high melting temperature and a moderately low tensile strength.
The graph bars on the material properties cards below compare AWS BAg-8 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
770 to 890 °C 1410 to 1630 °F
Latent Heat of Fusion
140 J/g
Melting Completion (Liquidus)
780 °C 1430 °F
Melting Onset (Solidus)
780 °C 1430 °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
84 GPa 12 x 106 psi
Poisson's Ratio
0.36
Shear Modulus
31 GPa 4.4 x 106 psi
Tensile Strength: Ultimate (UTS)
150 MPa 22 x 103 psi
Common Calculations
Stiffness to Weight: Axial
4.6 points
Stiffness to Weight: Bending
14 points
Strength to Weight: Axial
4.1 points
Strength to Weight: Bending
6.2 points
Thermal Shock Resistance
6.7 points
Alloy Composition
| Ag | 71 to 73 | |
| Cu | 26.9 to 29 | |
| 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