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.