Welding Consumables
| UNS Number | UNS N06625 |
| Industry Name | ERNiCrMo-3, ENiCrMo-3 (AWS A5.11) |
| Product Forms | Covered electrode (SMAW stick electrode), solid welding wire, bare welding rod (cut length rod) |
General Characteristics
ERNiCrMo-3 is a solid-solution strengthened nickel-based filler metal. It is the matching consumable for Alloy 625, engineered so the deposited weld metal reproduces Alloy 625’s corrosion and mechanical properties.
Ordinary nickel weld deposits could not deliver equivalent resistance to chloride pitting, crevice corrosion and stress corrosion cracking when joining or cladding Alloy 625. It retains excellent corrosion performance in as-welded condition under chloride, sour gas and moderate elevated temperature loads, making it ideal for pressure vessel cladding, valve seat overlay, subsea piping and dissimilar metal transition joints.
Compared to ERNiCrMo-4, ERNiCrMo-3 offers good high-temperature oxidation performance and better economy for oil & gas sour service. Compared to ERNiFeCr-2, ERNiCrMo-3 is a corrosion-focused solid-solution grade usable in the as-welded state, while ERNiFeCr-2 requires post-weld aging to achieve full strength.
Chemical compositions of ERNiCrMo-3
Ni | Cr | Mo | Nb+Ta | Fe | C | Si | Mn | P | S |
≥58.0 | 20.0–23.0 | 8.0–10.0 | 3.15–4.15 | ≤5.0 | ≤0.10 | ≤0.50 | ≤0.50 | ≤0.020 | ≤0.015 |
GMAW(MIG)||Joining Alloy 625 plate and pipe|Dissimilar metal transition welds
SMAW||Field repair of corrosion damaged equipment
SAW||Large-area corrosion cladding on heavy pressure vessels
PAW||High-precision critical root pass welding
Technical Standards | Product Form |
AWS A5.14 / A5.14M | Nickel and nickel-alloy bare welding rods and wires (ERNiCrMo-3 solid wire & bare rod) |
AWS A5.11 / A5.11M | Nickel and nickel-alloy covered SMAW electrodes (ENiCrMo-3 covered electrode) |
ASME SFA-5.14 | Bare wire / bare rod for pressure vessel / boiler code |
ASME SFA-5.11 | Covered electrode for pressure vessel / boiler 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 matches ERNiCrMo-3 wire/rod and ENiCrMo-3 covered electrode?
A1: Primary match is Alloy 625 (UNS N06625). It is also widely used for dissimilar joints between nickel alloys, duplex stainless steel, 300-series stainless and low alloy steels. ERNiCrMo-3 includes solid welding wire and bare welding rod under AWS A5.14; ENiCrMo-3 is the covered stick electrode variant under AWS A5.11.
Q2: What corrosion environments is ERNiCrMo-3 / ENiCrMo-3 weld deposit resistant to?
A2: Weld metal resists pitting, crevice corrosion and stress corrosion cracking in chloride, sour gas (H₂S) and oxidizing media. It maintains strength at elevated temperature.
Q3: Is preheating required when using ERNiCrMo-3 wire/rod or ENiCrMo-3 covered electrode?
A3: Preheat is generally not required for nickel alloy base material. For thick carbon / low alloy steel substrates, low preheat (max 150°C) may be specified to avoid hydrogen cracking. Interpass temperature is normally limited ≤150°C.
Q4: What shielding gas is recommended for GTAW / GMAW with ERNiCrMo-3 wire or bare rod? What about SMAW ENiCrMo-3 electrode?
A4: GTAW: pure Argon. GMAW: Argon + small CO₂ or Argon-Oxygen blends; pure argon preferred for best corrosion resistance. SMAW ENiCrMo-3 covered electrode uses no external shielding gas; protection comes from electrode flux coating.
Q5: Can ERNiCrMo-3 wire/rod and ENiCrMo-3 electrode be used for overlay cladding?
A5: Yes, both are common choices for corrosion-resistant overlay on carbon steel and low alloy steel for pressure vessels, waste incinerators and oilfield equipment.