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AWS BAg-3 (P07501) Filler Metal

AWS BAg-3 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-3 is the AWS designation for this material. P07501 is the UNS number.

It has a moderately low melting temperature among the silver-based braze fillers in the database.

The graph bars on the material properties cards below compare AWS BAg-3 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

80 GPa 12 x 106 psi

Poisson's Ratio


Shear Modulus

30 GPa 4.4 x 106 psi

Tensile Strength: Ultimate (UTS)

170 MPa 25 x 103 psi

Thermal Properties

Brazing Temperature

690 to 900 °C 1270 to 1650 °F

Latent Heat of Fusion

120 J/g

Melting Completion (Liquidus)

690 °C 1270 °F

Melting Onset (Solidus)

630 °C 1170 °F

Specific Heat Capacity

290 J/kg-K 0.069 BTU/lb-°F

Thermal Expansion

22 µm/m-K

Otherwise Unclassified Properties


9.3 g/cm3 580 lb/ft3

Embodied Carbon

49 kg CO2/kg material

Embodied Energy

770 MJ/kg 330 x 103 BTU/lb

Common Calculations

Stiffness to Weight: Axial

4.8 points

Stiffness to Weight: Bending

15 points

Strength to Weight: Axial

5.1 points

Strength to Weight: Bending

7.3 points

Thermal Shock Resistance

6.9 points

Alloy Composition

Silver (Ag)Ag 49 to 51
Cadmium (Cd)Cd 15 to 17
Zinc (Zn)Zn 13.5 to 17.5
Copper (Cu)Cu 14.5 to 16.5
Nickel (Ni)Ni 2.5 to 3.5
Residualsres. 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