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Inconel 718 Welding Wire (ERNiFeCr-2) - TIG & MIG Filler Metal Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 and ISO 14001 certified supplier and stockist of INCONEL 718 welding wire in Mumbai, India. We supply ERNiFeCr-2 TIG filler rods and MIG wire classified under AWS A5.14 / ASME SFA-5.14, with the designation UNS N07718, AMS 5832.
ERNiFeCr-2 (INCONEL® Filler Metal 718) contains about 52% nickel, 19% chromium, 18% iron, 5% niobium plus tantalum, and 3% molybdenum is strengthened by the gamma double prime (γ″) Ni₃Nb phase, a hard precipitate that forms within the austenitic (FCC) matrix during heat treatment. It is a nickel‑based welding wire that gives the highest strength of any standard nickel alloy filler and resists post‑weld cracking very well. This makes Alloy 718 a widely used precipitation‑hardened superalloy. Properly aged welds can reach about 185 ksi (1275 MPa) ultimate tensile strength and 150 ksi (1034 MPa) yield strength. GTAW (TIG) is the preferred welding process; GMAW (MIG) can cause micro‑fissuring because niobium tends to segregate during solidification. The wire is supplied as TIG rods, MIG spools, reels, and coils from 0.76 to 4.70 mm diameter for demanding uses in aerospace, rockets, cryogenic tanks, oil and gas, power generation, and nuclear components.
Every shipment from Nicorex Alloys carries MTC 3.1 per EN 10204 certifying conformance to AWS A5.14 ERNiFeCr-2 and AMS 5832. Post-weld ageing per AMS 5663 is mandatory for structural applications. No dedicated SMAW electrode exists for 718; dissimilar joints use HASTELLOY S or W filler wires.
Inconel 718 Welding Wire Specifications
The following table summarises verified specifications, mechanical performance, and other requirements for ERNiFeCr-2 filler wire used with Inconel 718.
| Property | Value |
|---|---|
| AWS Classification | A5.14 ERNiFeCr-2 |
| UNS Number | N07718 |
| Welding Processes | GTAW (preferred), GMAW (micro-fissuring risk) |
| Polarity | TIG: DCEN MIG: DCEP |
| Shielding Gas | 100% Ar (GTAW); Ar or Ar/He (GMAW — no pure CO₂) |
| TIG Cut Lengths | 0.76–4.70 mm (0.030–0.187 in) |
| MIG Spools | 0.76–2.40 mm (0.030–0.094 in) |
Wire diameters range from 0.76 to 4.70 mm (0.030-0.187 in). Standard TIG rods are 914 mm (36 in) long.
AWS Classification Explained: ERNiFeCr-2
The table below explains the complete breakdown of AWS code ERNiFeCr-2 of each character.
| Prefix / Suffix | Meaning |
|---|---|
| ER | Electrode/Rod — bare filler for GTAW and GMAW |
| Ni | Nickel base (~52% Ni) |
| Fe | Iron as the second major element (~18%) — Fe content exceeds Cr |
| Cr | Chromium (~19%) |
| -2 | Second alloy in the NiFeCr series (ERNiFeCr-1 = Incoloy 825) |
“NiFeCr” is unique for its higher iron (~18%) than chromium (~19%); most nickel fillers are labelled “NiCr” or “NiCrMo.” There is no dedicated SMAW electrode for Alloy 718 in AWS A5.11. ASME Section IX classifies this filler as F‑43, with no A‑Number.
Chemical Composition of ERNiFeCr-2 Weld Deposit (%)
AWS A5.14 composition limits of ERNiFeCr-2 filler wire are mentioned below. Its Ni‑Fe‑Cr‑Nb‑Mo chemistry is designed for precipitation hardening through the γ″ (Ni₃Nb) phase.
| Element | Nickel (Ni) | Chromium (Cr) | Iron (Fe) | Niobium + Tantalum (Nb+Ta) | Molybdenum (Mo) | Titanium (Ti) | Aluminium (Al) | Carbon (C) | Manganese (Mn) | Silicon (Si) | Copper (Cu) | Cobalt (Co) | Phosphorus (P) | Sulfur (S) | Boron (B) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AWS A5.14 Requirement (%) | 50.0–55.0 | 17.0–21.0 | Remainder | 4.75–5.50 | 2.80–3.30 | 0.65–1.15 | 0.20–0.80 | 0.08 max | 0.35 max | 0.35 max | 0.30 max | 1.00 max | 0.015 max | 0.015 max | 0.006 max |
| Typical (%) | 52.5 | 19.0 | ~18.0 | 5.1 | 3.0 | 0.9 | 0.5 | 0.04 | 0.15 | 0.10 | 0.05 | 0.10 | 0.005 | 0.003 | 0.003 |
Niobium (4.75-5.50%) is the main strengthening element. During ageing, it forms the γ″ (Ni₃Nb) phase, which gives 718 its high strength. The higher iron (~18%) content reduces cost. Molybdenum adds extra strength, while titanium and aluminium help stabilise grain boundaries. Controlled levels of copper, phosphorus, and sulfur reduce the risk of hot cracking and micro‑fissuring.
Mechanical Properties of ERNiFeCr-2 (Inconel 718) Weld Deposits
These tables show typical ERNiFeCr-2 weld properties in as-welded, solution-annealed and fully aged conditions.
Table 1: As-Welded / Solution Annealed
| Condition | UTS | YS (0.2%) | Elongation |
|---|---|---|---|
| Typical (As-Welded / Solution Annealed) | ~120–130 ksi (~827–896 MPa) | ~70–80 ksi (~483–552 MPa) | ~25–35% |
Table 2: Fully Aged (per AMS 5663)
| Condition | UTS | YS (0.2%) | Elongation | Hardness |
|---|---|---|---|---|
| Typical (Fully Aged per AMS 5663) | ~180–185 ksi (1241–1275 MPa) | ~145–155 ksi (1000–1069 MPa) | ~12–20% | ~38–44 HRC |
When 718 welds are aged, tensile strength rises by about 40-50% and yield strength nearly doubles. Post‑weld ageing is required for structural parts. 718 is safe up to 649°C. It also stays tough down to -253°C for liquid hydrogen and oxygen service.
Base Metal Compatibility for ERNiFeCr-2 Filler Metal
This table shows which base metals work with ERNiFeCr-2 filler metal, including 718 matches and recommended fillers for dissimilar joints.
Matching Base Metals
| Base Metal | UNS | P-No. | Application |
|---|---|---|---|
| Inconel 718 | N07718 | P-43 | Primary matching filler |
| Alloy 706 | N09706 | P-43 | Compatible |
| X-750 | N07750 | P-43 | Compatible |
Dissimilar Joint Recommendations
| Joint Combination | Recommended Filler | Notes |
|---|---|---|
| 718 to other Ni alloys | HASTELLOY S (AMS 5838) or W (AMS 5786/5787) | Solid-solution fillers avoid ageing |
| 718 to stainless steel | ERNiCr-3 (FM 82) or ERNiCrMo-3 (FM 625) | Standard dissimilar fillers |
| 718 to carbon steel | ERNiCr-3 (FM 82) | CTE buffer benefit |
ERNiFeCr-2 can be used in any joint; age‑treat the entire weldment like 718. If the other material cannot handle 718°C (1325°F) ageing, choose a solid‑solution filler instead.
Welding Parameters & PWHT for ERNiFeCr-2 (Inconel 718) Filler Wire
This table shows recommended welding settings and post‑weld heat treatments for ERNiFeCr-2 filler wire for different welding processes.
| Process / Diameter | Current (A) / Mode | Shielding Gas |
|---|---|---|
| GTAW (TIG) | DCEN (Preferred) | 100% Argon |
| GMAW (MIG) | DCEP (Short-Arc) | Argon or Ar/He |
| GMAW (MIG) | DCEP (Short-Arc) | No pure CO₂ |
No preheat is needed. Keep interpass temperature below 93°C to avoid micro‑fissuring. Clean the joint with solvent and stainless tools. For structural welds, perform post‑weld ageing: solution anneal, then follow controlled double-ageing cycles as per AMS 5663 or AMS 5662.
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Industries and Applications of ERNiFeCr-2 Filler Metal
ERNiFeCr-2 filler metal is widely used in tough applications because it is very strong, resists corrosion, and performs well at both high and very low temperatures.
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Aerospace: Commonly used for turbine discs, compressor cases, rings, seals, shrouds, and high‑temperature fasteners.
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Liquid Rocket Propulsion: Often selected for combustion chambers, turbopump housings, injector plates, and thrust chambers.
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Cryogenic Tankage: Well‑suited for storage tanks, transfer lines, and fittings carrying liquid hydrogen, oxygen, and LNG at extremely low temperatures.
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Oil and Gas: Widely used in subsea fasteners, wellhead parts, tree connectors, and packers, compliant with NACE MR0175 for sour‑service environments.
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Power Generation: Frequently applied to fasteners, springs, and structural parts in gas and steam turbines.
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Nuclear: Trusted for reactor vessel internals, fuel assembly parts, and control rod drive mechanisms where long‑term strength and reliability are critical.
Storage & Handling of ERNiFeCr-2 Welding Wire
ERNiFeCr-2 is a bare nickel alloy filler, so it does not need re-baking. Store it at 15-5°C, under 60% humidity, in sealed original packaging and away from carbon steel. Shelf life is unlimited if the package stays sealed. Handle only with clean, lint-free gloves and dedicated stainless steel tools. If the wire gets dirty, clean it with acetone or IPA. Avoid contamination with sulfur, lead, zinc, copper or tin, as these can cause micro‑fissures in the weld.
Available Forms & Packaging of Inconel 718 Filler Wire
The table below presents available forms and packaging options for Inconel 718 filler wire, including TIG cut lengths, MIG spools, reels and coils.
| Form | Diameter Range | Packaging Options |
|---|---|---|
| TIG Cut Lengths | 0.76–4.70 mm (0.030–0.187 in) | 914 mm (36 in) straight lengths in tubes or bundles |
| MIG Spools | 0.76–2.40 mm (0.030–0.094 in) | Standard spools such as D100, D200, D300 |
| Reels | 0.76–4.00 mm (0.030–0.157 in) | Large reels for automated and continuous welding |
| Coils | 0.76–4.00 mm (0.030–0.157 in) | Loose coils for SAW or high-volume applications |
Wire sizes of 3.20 mm and above are supplied only as TIG rods. Wire sizes of 4.00 mm and above are not supplied on reels. All wire is supplied with an MTC 3.1 certificate according to EN 10204, confirming that it meets AWS A5.14 ERNiFeCr-2 and AMS 5832 requirements.
How to Order Inconel 718 Welding Wire from Nicorex Alloys
To order ERNiFeCr-2 from Nicorex Alloys, provide the following details in your RFQ.
- Specification: AWS A5.14 ERNiFeCr-2 or AMS 5832.
- Form: TIG rod (preferred), MIG spool, reel, or coil.
- Diameter: TIG rods 0.76-4.70 mm; MIG wire 0.76-2.40 mm.
- Quantity: In kg or number of tubes/spools. Single-heat if required.
- Heat/Lot Traceability: Required for aerospace, rocket, and nuclear applications.
- Testing & Certification: MTC 3.1 per EN 10204. Additional: chemical re-verification, mechanical testing, third-party inspection.
- Age-Hardening Verification: Specify aged weld deposit test results and schedule (AMS 5662 or AMS 5663).
- Aerospace/OEM Requirements: GE, P&W, Rolls-Royce, Boeing, or NASA/ESA.
- Packaging: Sealed tubes (TIG), sealed spools (MIG). Vacuum-sealed if required.
- Delivery: Domestic (India) or international.
Frequently Asked Questions - ERNiFeCr-2 (Inconel 718) Welding Wire
What is the Difference between ERNiFeCr-2 (718) and ERNiCrCoMo-2 (HAYNES 282)?
ERNiFeCr-2 (718) uses gamma double prime and works up to 649°C with higher room-temperature strength. ERNiCrCoMo-2 (282) uses gamma prime and works up to 927°C, has better high-temperature creep life, and much lower iron content.
Why does ERNiFeCr-2 cause micro-fissuring in GMAW?
The high niobium in ERNiFeCr-2 segregates to interdendritic areas and forms low-melting phases. With GMAW’s higher heat input, these liquid films remain longer at grain boundaries, which promotes micro-fissuring.
Is post-weld ageing mandatory for ERNiFeCr-2 weld deposits?
Post-weld ageing is required for structural parts because the as-welded strength is low. Double ageing raises tensile and yield strength to design levels. For non-structural, cosmetic or sealing welds, ageing is optional.
Can ERNiFeCr-2 be used for SMAW (Stick) welding?
There is no dedicated ERNiFeCr-2 SMAW electrode in AWS A5.11. Other electrodes can be used for 718 with SMAW.
What is the maximum service temperature for Inconel 718 weld deposits?
The maximum service temperature is 649°C. Above this, the strengthening gamma double prime phase transforms to the delta phase, causing strength loss.
When should you not use ERNiFeCr-2 welding wire?
Do not use ERNiFeCr-2 above 649°C without post-weld ageing, for GMAW without accepted micro-fissuring, for dissimilar joints needing lower ageing temperatures, or for general aqueous corrosion.