AWS BAg-1a (P07500) Filler Metal
AWS BAg-1a is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-1a is the AWS designation for this material. P07500 is the UNS number.
It has a moderately high tensile strength and a moderately low melting temperature among silver-based braze fillers.
The graph bars on the material properties cards below compare AWS BAg-1a 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.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
77 GPa 11 x 106 psi
Poisson's Ratio
0.33
Shear Modulus
29 GPa 4.2 x 106 psi
Tensile Strength: Ultimate (UTS)
180 MPa 26 x 103 psi
Thermal Properties
Brazing Temperature
640 to 760 °C 1180 to 1400 °F
Latent Heat of Fusion
120 J/g
Melting Completion (Liquidus)
640 °C 1180 °F
Melting Onset (Solidus)
630 °C 1160 °F
Specific Heat Capacity
280 J/kg-K 0.068 BTU/lb-°F
Thermal Expansion
22 µm/m-K
Otherwise Unclassified Properties
Density
9.3 g/cm3 580 lb/ft3
Embodied Carbon
48 kg CO2/kg material
Embodied Energy
760 MJ/kg 330 x 103 BTU/lb
Common Calculations
Stiffness to Weight: Axial
4.6 points
Stiffness to Weight: Bending
15 points
Strength to Weight: Axial
5.4 points
Strength to Weight: Bending
7.6 points
Thermal Shock Resistance
7.5 points
Alloy Composition
| Ag | 49 to 51 | |
| Cd | 17 to 19 | |
| Zn | 14.5 to 18.5 | |
| Cu | 14.5 to 16.5 | |
| 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