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
| Ni | 62 to 69 | |
| Cu | 20.6 to 38 | |
| Mn | 0 to 4.0 | |
| Fe | 0 to 2.5 | |
| Si | 0 to 1.5 | |
| Ti | 0 to 1.0 | |
| Al | 0 to 0.75 | |
| C | 0 to 0.1 | |
| P | 0 to 0.020 | |
| S | 0 to 0.015 | |
| res. | 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