ERCuNi

Class: ERCuNi
AWS: A5.7

Conforms to Certification: AWS A5.7 | ASME SFA A5.7

Weld Process: GTAW 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
.035 x 36
.045 x 36
1/16 x 36
3/32 x 36
1/8 x 36

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 Metals 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 TIG, MIG, and SAW Welding of Nickel Alloys

Process Diameter of Wire Voltage (V) Amperage (A) Gas
Tig .035 inches x 36 12-15 60 -90 100% Argon
.045 inches x 36 13-16 80-110 100% Argon
1/16 inches x 36 14-18 90-130 100% Argon
3/32 inches x 36 15-20 120-175 100% Argon
1/8 inches x 36 15-20 150-220 100% Argon

Note:  Other shielding Gases may be used for Tig welding. Shielding gases are chosen taking Quality, cost, and Operability into consideration.

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.