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	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.