AWS BAg-2a (P07300) Filler Metal
AWS BAg-2a is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-2a is the AWS designation for this material. P07300 is the UNS number.
It has a fairly low melting temperature and a moderately low density among silver-based braze fillers.
The graph bars on the material properties cards below compare AWS BAg-2a 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
83 GPa 12 x 106 psi
Poisson's Ratio
0.32
Shear Modulus
31 GPa 4.5 x 106 psi
Tensile Strength: Ultimate (UTS)
170 MPa 25 x 103 psi
Thermal Properties
Brazing Temperature
690 to 840 °C 1270 to 1550 °F
Latent Heat of Fusion
130 J/g
Melting Completion (Liquidus)
710 °C 1310 °F
Melting Onset (Solidus)
610 °C 1120 °F
Specific Heat Capacity
310 J/kg-K 0.074 BTU/lb-°F
Thermal Expansion
23 µm/m-K
Otherwise Unclassified Properties
Density
8.8 g/cm3 550 lb/ft3
Embodied Carbon
30 kg CO2/kg material
Embodied Energy
470 MJ/kg 200 x 103 BTU/lb
Common Calculations
Stiffness to Weight: Axial
5.2 points
Stiffness to Weight: Bending
17 points
Strength to Weight: Axial
5.4 points
Strength to Weight: Bending
7.8 points
Thermal Shock Resistance
6.5 points
Alloy Composition
| Ag | 29 to 31 | |
| Cu | 26 to 28 | |
| Zn | 21 to 25 | |
| Cd | 19 to 21 | |
| 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