ERNiCu-7 – wire and rod for Monel 400 and K-500
Nickel-copper filler metal (about 65Ni-30Cu) with titanium, for welding alloy 400 and making joints or repairs on K-500, in seawater, hydrofluoric acid and brines.
Product forms and equivalents
| Process | Classification |
|---|---|
| TIG rod (GTAW) | ERNiCu-7 |
| Solid MIG/MAG wire (GMAW) | ERNiCu-7 |
| Covered electrode (SMAW) | ENiCu-7 – AWS A5.11 |
| Submerged arc wire (SAW) | ERNiCu-7 + flux |
| Designation | Value |
|---|---|
| AWS | ERNiCu-7 |
| Specification | AWS A5.14/A5.14M / ASME SFA-5.14 |
| UNS | N04060 |
| Others | EN ISO 18274: S Ni 4060 (NiCu30Mn3Ti); W.Nr. 2.4377 |
| Trade designation | Liga 60 (arame para soldar Monel 400) (designação de material) |
Chemical composition (%)
| Element | wt. % |
|---|---|
| C | ≤ 0.15 |
| Ni | 62.0 – 69.0 |
| Cu | Balance |
| Ti | 1.5 – 3.0 |
| Mn | ≤ 4.0 |
| Fe | ≤ 2.5 |
| Al | ≤ 1.25 |
| Si | ≤ 1.25 |
| P | ≤ 0.02* |
| S | ≤ 0.015 |
Properties of the deposited metal
| Property | Value |
|---|---|
| Tensile strength of deposited metal | ≥ 480 MPa (AWS A5.11 minimum for ENiCu-7, reference) |
| Elongation | ≥ 30 % (AWS A5.11 minimum for ENiCu-7, reference) |
Materials welded with ERNiCu-7
Dissimilar joints: Can join alloy 400 to carbon steel and to copper-nickel; for joints with stainless, ERNiCr-3 is usually preferred.
Why the composition differs from the base metal
The wire has about 2–3 % titanium, which alloy 400 does not have. Titanium deoxidizes and denitrifies the pool, preventing the porosity typical of Ni-Cu alloys. On K-500 the bead does not age like the base metal, so the joint ends up with the strength of alloy 400.
Welding precautions
- No preheating; interpass below 150 °C.
- On K-500, weld the solution-treated material and be aware that the weld does not reach the strength of the aged metal.
- TIG with pure argon or argon-helium; argon root purge. Rigorous cleaning: oil, paint and markers contaminate the nickel alloy with sulfur and lead.
Frequently asked questions
What is ERNiCu-7 used for?
Nickel-copper filler metal (about 65Ni-30Cu) with titanium, for welding alloy 400 and making joints or repairs on K-500, in seawater, hydrofluoric acid and brines.
Why is the composition of ERNiCu-7 different from the material it welds?
The wire has about 2–3 % titanium, which alloy 400 does not have. Titanium deoxidizes and denitrifies the pool, preventing the porosity typical of Ni-Cu alloys. On K-500 the bead does not age like the base metal, so the joint ends up with the strength of alloy 400.
Which covered electrode corresponds to ERNiCu-7?
ENiCu-7 – AWS A5.11.
What precautions apply when welding with ERNiCu-7?
No preheating; interpass below 150 °C. On K-500, weld the solution-treated material and be aware that the weld does not reach the strength of the aged metal. TIG with pure argon or argon-helium; argon root purge. Rigorous cleaning: oil, paint and markers contaminate the nickel alloy with sulfur and lead.
