ERNiFeCr-2 – wire and rod for Inconel 718
Precipitation-hardenable Ni-19Cr-18Fe-5Nb-3Mo filler metal, for welding alloy 718 in aerospace, oil and gas and high-strength components.
Product forms and equivalents
| Process | Classification |
|---|---|
| TIG rod (GTAW) | ERNiFeCr-2 |
| Solid MIG/MAG wire (GMAW) | ERNiFeCr-2 |
| Designation | Value |
|---|---|
| AWS | ERNiFeCr-2 |
| Specification | AWS A5.14/A5.14M / ASME SFA-5.14 |
| UNS | N07718 |
| Others | EN ISO 18274: S Ni 7718 (NiFe19Cr19Nb5Mo3); W.Nr. 2.4667 |
| Trade designation | Liga 718 / Inconel 718 (designação de material) |
Chemical composition (%)
| Element | wt. % |
|---|---|
| C | ≤ 0.08 |
| Ni | 50.0 – 55.0 |
| Cr | 17.0 – 21.0 |
| Nb + Ta | 4.75 – 5.50 |
| Mo | 2.80 – 3.30 |
| Ti | 0.65 – 1.15 |
| Al | 0.20 – 0.80 |
| Fe | Balance |
| Mn | ≤ 0.35 |
| Si | ≤ 0.35 |
| Cu | ≤ 0.30* |
| B | ≤ 0.006* |
| P | ≤ 0.015 |
| S | ≤ 0.015 |
Materials welded with ERNiFeCr-2
Why the composition differs from the base metal
It is one of the few cases where the wire has practically the same chemistry as the base metal, because the goal is for the bead to also precipitation harden (gamma double prime) during aging. The limits for C, Si, P, S and B are the same as alloy 718; control of solidification cracking and Laves phase in the bead comes from the procedure (low heat input and controlled interpass), not from a different chemistry.
Welding precautions
- Weld the part in the solution-treated condition; after welding, solution treat and age per the part specification to obtain strength close to the base metal.
- Low heat input and fast cooling limit niobium segregation (Laves phase).
- 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 ERNiFeCr-2 used for?
Precipitation-hardenable Ni-19Cr-18Fe-5Nb-3Mo filler metal, for welding alloy 718 in aerospace, oil and gas and high-strength components.
Why is the composition of ERNiFeCr-2 different from the material it welds?
It is one of the few cases where the wire has practically the same chemistry as the base metal, because the goal is for the bead to also precipitation harden (gamma double prime) during aging. The limits for C, Si, P, S and B are the same as alloy 718; control of solidification cracking and Laves phase in the bead comes from the procedure (low heat input and controlled interpass), not from a different chemistry.
What precautions apply when welding with ERNiFeCr-2?
Weld the part in the solution-treated condition; after welding, solution treat and age per the part specification to obtain strength close to the base metal. Low heat input and fast cooling limit niobium segregation (Laves phase). TIG with pure argon or argon-helium; argon root purge. Rigorous cleaning: oil, paint and markers contaminate the nickel alloy with sulfur and lead.
