ERCuNi
Class: ERCuNi
AWS: A5.7
Conforms to Certification: AWS A5.7 | ASME SFA A5.7
Weld Process: GMAW, ASAW and Oxy-Fuel Welding Processes
| AWS Chemical Composition Requirements | |
| Cu = Remainder | Mn = 1.0 max |
| Fe = 0.40 – 0.75 | Si = 0.25 max |
| Ni = 29.0 – 32.0 | P = 0.02 |
| Pb = 0.02 | Ti = 0.20 – 0.50 |
| Other = 0.50 max | |
Available Sizes |
|
| Diameter X Spool Sizes | Diameter X Coil Sizes |
| .035 x 33# | 1/16 x Coil |
| .045 x 33# | 3/32 x Coil |
| 1/16 x 33# | 1/8 x Coil |
| 5/32 x Coil | |
Application
ERCuNi (NA67) is used for gas metal and gas tungsten arc welding. Can also be used by oxy-fuel welding of 70/30, 80/20, and 90/10 copper nickel alloys. A barrier layer of nickel alloy 610 is recommended prior to overlaying steel with GMAW weld process.
| Deposited Chemical Composition % (Typical) | ||
| Ni = 31.0 | Mn = 0.75 | P = 0.006 |
| Cu = Balance | Si = 0.10 | Ti = 0.35 |
| Fe = 0.55 | ||
| Deposited All Weld Metal Properties % (AW) | |
| Tensile Strength | 54,000 psi |
| Yield Strength | 21,500 psi |
| Elongation | 32% |
Deposited Charpy-V-Notch Impact Properties %
Not applicable
Recommended Welding Parameters for MIG and SAW Welding of Nickel Alloys |
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| Process | Diameter of Wire | Voltage (V) | Amperage (A) | Gas |
| MIG | .035 inches | 26 – 29 | 150 – 190 | 75% Argon + 25% Helium |
| .045 inches | 28 – 32 | 180 – 220 | 75% Argon + 25% Helium | |
| 1/16 inches | 29 – 33 | 200 – 250 | 75% Argon + 25% Helium | |
| SAW | 3/32 inches | 28 – 30 | 275 – 350 | Suitable Flux May Be Used |
| 1/8 inches | 29 – 32 | 350 – 450 | Suitable Flux May Be Used | |
| 5/32 inches | 30 – 33 | 400 – 550 | Suitable Flux May Be Used | |
Note: Other shielding Gases may be used for Mig welding. Shielding gases are chosen taking Quality, cost, and Operability into onsideration.
Note: Both agglomerated and fused fluxes can be used for submerged arc welding.
Note: The chemical composition of the flux mainly affects the chemistry of the weld metal and consequently its corrosion resistance and mechanical properties.