AWS BAg-19 (P07925) Filler Metal
AWS BAg-19 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-19 is the AWS designation for this material. P07925 is the UNS number.
It has a moderately high density among silver-based braze fillers. In addition, it has a very low heat capacity and a fairly low tensile strength.
The graph bars on the material properties cards below compare AWS BAg-19 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 980 °C 1410 to 1800 °F
Latent Heat of Fusion
120 J/g
Melting Completion (Liquidus)
890 °C 1640 °F
Melting Onset (Solidus)
760 °C 1400 °F
Specific Heat Capacity
250 J/kg-K 0.061 BTU/lb-°F
Thermal Expansion
20 µm/m-K
Other Material Properties
Density
10 g/cm3 650 lb/ft3
Elastic (Young's, Tensile) Modulus
74 GPa 11 x 106 psi
Poisson's Ratio
0.37
Shear Modulus
27 GPa 3.9 x 106 psi
Tensile Strength: Ultimate (UTS)
140 MPa 20 x 103 psi
Common Calculations
Stiffness to Weight: Axial
4.0 points
Stiffness to Weight: Bending
14 points
Strength to Weight: Axial
3.8 points
Strength to Weight: Bending
5.8 points
Thermal Shock Resistance
6.9 points
Alloy Composition
| Ag | 92 to 93 | |
| Cu | 6.6 to 7.9 | |
| Li | 0.15 to 0.3 | |
| 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