Welding Consumables
| UNS Number | UNS N07718 |
| Industry Name | ERNiFeCr-2, Inconel 718，ENiFeCr-2 (AWS A5.11) |
| Product Forms | Covered electrode (SMAW stick electrode), solid welding wire, bare welding rod (cut length rod) |
General Characteristics
ERNiFeCr-2 is a precipitation-hardening nickel-based filler metal. It is the matching consumable for Inconel 718, designed so the weld deposit responds to the same solution and age heat treatment as the 718 base material.
Conventional solid-solution nickel filler metals could not reach the full strength level of precipitation hardened Inconel 718 after welding. It achieves high strength together with excellent cryogenic toughness after proper post-weld heat treatment, making it ideal for gas turbine hot-section components, high-pressure wellhead parts, downhole tools and cryogenic structural weldments.
Compared to ERNiCrMo-3 and ERNiCrMo-4, ERNiFeCr-2 produces precipitation hardenable weld metal whose final strength depends on post weld heat treatment, while ERNiCrMo-3/4 are applied in the as-welded state for corrosion service. Compared to ERNiCrCoMo-1, ERNiFeCr-2 is the dedicated matching filler for Inconel 718, while ERNiCrCoMo-1 is used for higher-temperature turbine alloys.
Chemical compositions of ERNiCrMo-3
Ni | Cr | Fe | Nb+Ta | Mo | Ti | Al | C | Si | Mn | P | S |
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 | ≤0.35 | ≤0.35 | ≤0.015 | ≤0.015 |
GMAW(MIG)||Joining Inconel 718 plate and pipe|Dissimilar superalloy welds
SMAW||Field repair for gas turbine and downhole components
PAW||High-quality deep penetration welding for aerospace critical parts
Technical Standards | Product Form |
AWS A5.14 / A5.14M | Nickel and nickel-alloy bare welding rods and wires (ERNiFeCr-2 solid wire & bare rod) |
AWS A5.11 / A5.11M | Nickel and nickel-alloy covered SMAW electrodes (ENiFeCr-2 covered electrode) |
ASME SFA-5.14 | Bare wire / bare rod for pressure vessel and power code |
ASME SFA-5.11 | Covered electrode for pressure vessel and power code |
ISO 18274 | Nickel and nickel alloy bare filler metals (solid wire, bare rod) |
ISO 14172 | Nickel and nickel alloy covered electrodes |
Product form | Size range (mm) |
Spooled solid wire | Dia.0.8–3.2 |
Drum packed solid wire | Dia.1.0–2.4 |
TIG rod | Dia.1.6–3.2 |
Q1: What base metal is matched by ERNiFeCr-2 (wire/rod) and ENiFeCr-2 covered electrode?
A1: Primary matching alloy is Inconel 718 (UNS N07718). ERNiFeCr-2 includes solid welding wire and bare welding rod to AWS A5.14; ENiFeCr-2 is the SMAW covered electrode under AWS A5.11. Both used for joining 718 base metal and dissimilar joints with other nickel alloys or stainless steels.
Q2: Is post weld heat treatment required for ERNiFeCr-2 wire/rod or ENiFeCr-2 electrode welds?
A2: Yes. ERNiFeCr-2 / ENiFeCr-2 are precipitation hardening filler metals. To achieve full strength, the welded assembly must undergo solution treatment followed by age hardening, same as Inconel 718 base metal. Weld in as-welded condition has low strength.
Q3: What limits on interpass temperature during welding? Any SMAW special notes?
A3: Interpass temperature should be kept below 100°C to prevent overaging and detrimental phase precipitation. Rigorous pre-weld cleaning is mandatory. ENiFeCr-2 covered electrodes require proper baking before SMAW to minimise hydrogen risk.
Q4: Can ERNiFeCr-2 / ENiFeCr-2 welds be used at cryogenic temperatures?
A4: Yes. Properly heat-treated weld metal maintains excellent toughness at cryogenic service.
Q5: What shielding gas should I use for wire/rod? What for covered electrode?
A5: GTAW: pure argon. GMAW: pure argon is recommended; oxidizing gas mixtures are not advised. ENiFeCr-2 SMAW covered electrode uses flux shielding, no external gas supply.
Q6: What inspection and certification options exist?
A6: Standard MTC with heat analysis and weld deposit mechanical data.