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AWS ENiCu-7 (W84190) Weld Metal

AWS ENiCu-7 is a nickel-based filler metal for welding. Cited properties are appropriate for the as-welded condition. ENiCu-7 is the AWS designation for this material. W84190 is the UNS number.

It has the lowest melting temperature among nickel-based welding fillers. In addition, it has a very low embodied energy and a fairly low base cost.

The graph bars on the material properties cards below compare AWS ENiCu-7 to: nickel-based welding fillers (top), all nickel alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

160 GPa 24 x 106 psi

Elongation at Break

34 %

Poisson's Ratio

0.32

Shear Modulus

62 GPa 8.9 x 106 psi

Tensile Strength: Ultimate (UTS)

550 MPa 79 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Melting Completion (Liquidus)

1270 °C 2320 °F

Melting Onset (Solidus)

1230 °C 2240 °F

Specific Heat Capacity

430 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

21 W/m-K 12 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

3.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

50 % relative

Density

8.7 g/cm3 550 lb/ft3

Embodied Carbon

8.0 kg CO2/kg material

Embodied Energy

110 MJ/kg 49 x 103 BTU/lb

Embodied Water

250 L/kg 30 gal/lb

Common Calculations

Stiffness to Weight: Axial

10 points

Stiffness to Weight: Bending

21 points

Strength to Weight: Axial

17 points

Strength to Weight: Bending

17 points

Thermal Diffusivity

5.5 mm2/s

Thermal Shock Resistance

18 points

Alloy Composition

Nickel (Ni) 62 to 69
Copper (Cu) 20.6 to 38
Manganese (Mn) 0 to 4.0
Iron (Fe) 0 to 2.5
Silicon (Si) 0 to 1.5
Titanium (Ti) 0 to 1.0
Aluminum (Al) 0 to 0.75
Carbon (C) 0 to 0.1
Phosphorus (P) 0 to 0.020
Sulfur (S) 0 to 0.015
Residuals 0 to 0.5

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

AWS A5.11: Specification for Nickel and Nickel Alloy Welding Electrodes for Shielded Metal Arc Welding