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AWS BVAg-8 vs. AWS BAu-3

Both AWS BVAg-8 and AWS BAu-3 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a modest 28% of their average alloy composition in common, which, by itself, doesn't mean much.

For each property being compared, the top bar is AWS BVAg-8 and the bottom bar is AWS BAu-3.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 84
110
Poisson's Ratio 0.36
0.37
Shear Modulus, GPa 31
41
Tensile Strength: Ultimate (UTS), MPa 170
220

Thermal Properties

Brazing Temperature, °C 780 to 900
1030 to 1090
Latent Heat of Fusion, J/g 140
160
Melting Completion (Liquidus), °C 780
1030
Melting Onset (Solidus), °C 780
970
Specific Heat Capacity, J/kg-K 280
300
Thermal Expansion, µm/m-K 19
16

Otherwise Unclassified Properties

Density, g/cm3 10
13

Common Calculations

Stiffness to Weight: Axial, points 4.6
5.0
Stiffness to Weight: Bending, points 14
13
Strength to Weight: Axial, points 4.7
4.9
Strength to Weight: Bending, points 6.8
6.4
Thermal Shock Resistance, points 7.6
8.7

Alloy Composition

Cadmium (Cd), % 0 to 0.0010
0
Carbon (C), % 0 to 0.0050
0
Copper (Cu), % 27 to 29
60.9 to 63
Gold (Au), % 0
34.5 to 35.5
Lead (Pb), % 0 to 0.0020
0
Nickel (Ni), % 0
2.5 to 3.5
Phosphorus (P), % 0 to 0.0020
0
Silver (Ag), % 71 to 73
0
Zinc (Zn), % 0 to 0.0010
0
Residuals, % 0
0 to 0.15