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AWS BAg-34 (P07380) Filler Metal

AWS BAg-34 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-34 is the AWS designation for this material. P07380 is the UNS number.

It has a fairly high heat capacity and a moderately low density among silver-based braze fillers.

The graph bars on the material properties cards below compare AWS BAg-34 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

89 GPa 13 x 106 psi

Poisson's Ratio


Shear Modulus

34 GPa 4.9 x 106 psi

Tensile Strength: Ultimate (UTS)

170 MPa 25 x 103 psi

Thermal Properties

Brazing Temperature

680 to 840 °C 1260 to 1550 °F

Latent Heat of Fusion

140 J/g

Melting Completion (Liquidus)

720 °C 1330 °F

Melting Onset (Solidus)

650 °C 1200 °F

Specific Heat Capacity

330 J/kg-K 0.078 BTU/lb-°F

Thermal Expansion

21 µm/m-K

Otherwise Unclassified Properties


8.8 g/cm3 550 lb/ft3

Embodied Carbon

38 kg CO2/kg material

Embodied Energy

600 MJ/kg 260 x 103 BTU/lb

Common Calculations

Stiffness to Weight: Axial

5.6 points

Stiffness to Weight: Bending

17 points

Strength to Weight: Axial

5.4 points

Strength to Weight: Bending

7.7 points

Thermal Shock Resistance

6.5 points

Alloy Composition

Silver (Ag)Ag 37 to 39
Copper (Cu)Cu 31 to 33
Zinc (Zn)Zn 26 to 30
Tin (Sn)Sn 1.5 to 2.5
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