# AWS BAg-7 (P07563) Filler Metal

AWS BAg-7 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-7 is the AWS designation for this material. P07563 is the UNS number.

It has a moderately low tensile strength and a moderately low melting temperature among silver-based braze fillers.

The graph bars on the material properties cards below compare AWS BAg-7 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 10 ^{6} psi*

Poisson's Ratio

0.34

Shear Modulus

31 *GPa* 4.5 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

150 *MPa* 22 *x 10 ^{3} psi*

## Thermal Properties

Brazing Temperature

650 to 900 *°C* 1210 to 1650 *°F*

Latent Heat of Fusion

130 *J/g*

Melting Completion (Liquidus)

650 *°C* 1210 *°F*

Melting Onset (Solidus)

620 *°C* 1140 *°F*

Specific Heat Capacity

290 *J/kg-K* 0.070 *BTU/lb-°F*

Thermal Expansion

20 *µm/m-K*

## Otherwise Unclassified Properties

Density

9.3 *g/cm ^{3}* 580

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

860 *MJ/kg* 370 *x 10 ^{3} BTU/lb*

## Common Calculations

Stiffness to Weight: Axial

4.9 *points*

Stiffness to Weight: Bending

16 *points*

Strength to Weight: Axial

4.5 *points*

Strength to Weight: Bending

6.7 *points*

Thermal Shock Resistance

6.4 *points*

## Alloy Composition

Ag | 55 to 57 | |

Cu | 21 to 23 | |

Zn | 15 to 19 | |

Sn | 4.5 to 5.5 | |

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015