# AWS BAg-27 (P07251) Filler Metal

AWS BAg-27 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-27 is the AWS designation for this material. P07251 is the UNS number.

It has a fairly low melting temperature among silver-based braze fillers. In addition, it has a fairly high heat capacity and a fairly low density.

The graph bars on the material properties cards below compare AWS BAg-27 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

88 *GPa* 13 *x 10 ^{6} psi*

Poisson's Ratio

0.32

Shear Modulus

33 *GPa* 4.8 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

160 *MPa* 23 *x 10 ^{3} psi*

## Thermal Properties

Brazing Temperature

710 to 860 *°C* 1310 to 1580 *°F*

Latent Heat of Fusion

140 *J/g*

Melting Completion (Liquidus)

750 *°C* 1370 *°F*

Melting Onset (Solidus)

610 *°C* 1120 *°F*

Specific Heat Capacity

330 *J/kg-K* 0.078 *BTU/lb-°F*

Thermal Expansion

22 *µm/m-K*

## Otherwise Unclassified Properties

Density

8.7 *g/cm ^{3}* 540

*lb/ft*

^{3}Embodied Carbon

25 *kg CO _{2}/kg material*

Embodied Energy

400 *MJ/kg* 170 *x 10 ^{3} BTU/lb*

## Common Calculations

Stiffness to Weight: Axial

5.7 *points*

Stiffness to Weight: Bending

17 *points*

Strength to Weight: Axial

5.1 *points*

Strength to Weight: Bending

7.6 *points*

Thermal Shock Resistance

5.9 *points*

## Alloy Composition

Cu | 34 to 36 | |

Zn | 24.5 to 28.5 | |

Ag | 24 to 26 | |

Cd | 12.5 to 14.5 | |

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