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

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 – 30 270 – 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 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.