AWS BAg-21 (P07630) Filler Metal
AWS BAg-21 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-21 is the AWS designation for this material. P07630 is the UNS number.
It has a moderately low tensile strength and a moderately high density among silver-based braze fillers.
The graph bars on the material properties cards below compare AWS BAg-21 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
85 GPa 12 x 106 psi
Poisson's Ratio
0.36
Shear Modulus
31 GPa 4.6 x 106 psi
Tensile Strength: Ultimate (UTS)
150 MPa 22 x 103 psi
Thermal Properties
Brazing Temperature
700 to 900 °C 1290 to 1650 °F
Latent Heat of Fusion
140 J/g
Melting Completion (Liquidus)
800 °C 1480 °F
Melting Onset (Solidus)
690 °C 1280 °F
Specific Heat Capacity
280 J/kg-K 0.068 BTU/lb-°F
Thermal Expansion
19 µm/m-K
Otherwise Unclassified Properties
Density
9.8 g/cm3 610 lb/ft3
Embodied Energy
970 MJ/kg 420 x 103 BTU/lb
Common Calculations
Stiffness to Weight: Axial
4.8 points
Stiffness to Weight: Bending
15 points
Strength to Weight: Axial
4.2 points
Strength to Weight: Bending
6.4 points
Thermal Shock Resistance
6.6 points
Alloy Composition
| Ag | 62 to 64 | |
| Cu | 27.5 to 29.5 | |
| Sn | 5.0 to 7.0 | |
| Ni | 2.0 to 3.0 | |
| 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
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015