AWS BAg-37 (P07253) Filler Metal
AWS BAg-37 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-37 is the AWS designation for this material. P07253 is the UNS number.
It has a very low density among silver-based braze fillers. In addition, it has a very high heat capacity and a moderately high tensile strength.
The graph bars on the material properties cards below compare AWS BAg-37 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
94 GPa 14 x 106 psi
Poisson's Ratio
0.32
Shear Modulus
36 GPa 5.2 x 106 psi
Tensile Strength: Ultimate (UTS)
180 MPa 26 x 103 psi
Thermal Properties
Brazing Temperature
780 to 890 °C 1430 to 1630 °F
Latent Heat of Fusion
150 J/g
Melting Completion (Liquidus)
780 °C 1430 °F
Melting Onset (Solidus)
690 °C 1270 °F
Specific Heat Capacity
350 J/kg-K 0.083 BTU/lb-°F
Thermal Expansion
21 µm/m-K
Otherwise Unclassified Properties
Density
8.5 g/cm3 530 lb/ft3
Embodied Carbon
26 kg CO2/kg material
Embodied Energy
410 MJ/kg 180 x 103 BTU/lb
Common Calculations
Stiffness to Weight: Axial
6.1 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
5.9 points
Strength to Weight: Bending
8.3 points
Thermal Shock Resistance
6.6 points
Alloy Composition
| Cu | 39 to 41 | |
| Zn | 31 to 35 | |
| Ag | 24 to 26 | |
| Sn | 1.5 to 2.5 | |
| 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