GEN C656 Overview
Silicon Bronze (may also be known as Everdur) is a copper-based filler metal containing about 3% silicon and may have small percentages of manganese, tin, and zinc. C656 is typically used for gas-tungsten arc welding and gas-metal arc welding of copper, brass, bronze, steel, galvanized steels and also cast iron. It is also used for surfacing areas that are subjected to corrosion. (Specification AWS S5.7 / ASME SFA 5.7 Class ERCuSi-A)
AWS Chemical Composition (Typical)
| %Cu | %Sn | %Mn | %Si | %Fe |
|---|---|---|---|---|
| rem. 95.9 |
1.0 max. 0.01 |
1.5 max. 0.90 |
2.8 – 4.0 3.1 |
0.50 max. 0.03 |
| %Zn | %Pb | %Al | Total Others |
|---|---|---|---|
| 1.0 max. 0.02 |
0.02 max. 0.01 |
0.01 0.004 |
0.50 max. |
Typical Weld Metal Mechanical Properties
| Tensile Strength | 50,000 psi. min. |
| Elongation | 65% |
| Electrical Conductivity | 7% (of IACS) |
Typical Welding Parameters
| Process | Diameter | Voltage | Amperage | Gas/Flux |
|---|---|---|---|---|
| TIG (GTAW) | 1/16” (1.6 mm) |
Electrode Negative (DCEN) |
70 – 150 | 100% Ar |
| 3/32” (2.4 mm) | 150 – 200 | 100% Ar | ||
| 1/8” (3.2 mm) | 230 – 390 | 100% Ar | ||
| MIG (GMAW) | .035” (0.9 mm) | 23 – 26 | 145 – 185 | 75% Ar – 25% He |
| .045” (1.1 mm) | 26 – 29 | 195 – 225 | 75% Ar – 25% He |