Monel 400 Filler Wire (ERNiCu-7) — AWS A5.14 Supplier & Exporter in India
The main nickel-copper welding consumable used in joining, overlaying, and repairing Monel 400 parts is the ERNiCu-7 Monel 400 filler wire (AWS A5.14 / ASME SFA-5.14): it provides weld deposits that are similar to the corrosion resistance and strength of the alloy. Offered as TIG straight rods (5 kg box), MIG spools (15 kg, 0.8-1.6 mm), and cut lengths of SAW and GMAW processes of a diameter range of 0.8 mm to 4.0mm, all with EN 10204 3.1 MTC standard.
Kalpataru Piping Solutions produces and exports ISO 9001:2015 certified, EIL approved, ERNiCu-7 through certified, ex-stock on standard diameters, zero MOQ, and export documentations are in place (50+ countries).
✓ AWS A5.14 ERNiCu-7 ✓ ASME SFA-5.14 ✓ ISO 9001:2015 ✓ EIL Approved ✓ EN 10204 3.1 MTC ✓ F-No. 42 / A-No. 35 ✓ Zero MOQ ✓ 50+ Export Countries
| Parameter | Details |
| AWS Classification | ERNiCu-7 |
| Filler UNS No. | N04060 |
| ASME F-No. | 42 |
| ASME A-No. | 35 |
| Diameter Range | 0.8 mm – 4.0 mm |
| Available Forms | TIG Rod · MIG Spool · Cut Length |
Introduction to Monel 400 Filler Wire (ERNiCu-7)
ERNiCu-7 is the most widely used nickel-copper filler metal for welding and repairing parts made with Monel 400 base metal, producing weld deposits with similar levels of corrosion resistance and mechanical properties as the base metal.
The filler wire contains 67% nickel, 33% copper, and trace amounts of deoxidising elements (titanium and aluminium) – hence its UNS designation (N04060) which is different from the base metal designation (UNS N04400). This is important for WPS engineers: the filler UNS designation must be identified in Welding Procedure Specifications as per ASME Section IX.
ERNiCu-7 can be used with all major welding processes (GTAW/TIG, GMAW/MIG, SAW/Submerged arc, PAW/Plasma arc), making it applicable in pipe fabrication shops, offshore module mounting yards, fabrication of chemical plants and repair operations.
| Related Technical Guide: See our Monel 400 Welding Guide for preheat requirements, interpass temperature limits, post-weld heat treatment guidance, and full WPS parameter tables for ERNiCu-7 TIG and MIG welding. |
Specification of Monel 400 Filler Wire (ERNiCu-7)
| Parameter | Details |
| AWS Classification | ERNiCu-7 (AWS A5.14 / ASME SFA-5.14) |
| UNS Designation (Filler) | N04060 (distinct from base metal UNS N04400) |
| EN / DIN Designation | Werkstoff Nr. 2.4367 / SNi 4060 |
| ASME Section IX — F-No. | F-No. 42 — WPS Required |
| ASME Section IX — A-No. | A-No. 35 — WPS Required |
| Available Forms | TIG straight rods (1,000 mm, 5 kg box) · MIG spools (0.8–1.6 mm, 15 kg) · Cut lengths for SAW/GMAW |
| Diameter Range | 0.8, 1.0, 1.2, 1.6, 2.0, 2.4, 2.6, 3.2, 4.0 mm |
| Shielding Gas — GTAW (TIG) | 100% Argon or Argon/Helium blend |
| Shielding Gas — GMAW (MIG) | 100% Argon |
| Applicable Standards | AWS A5.14, ASME SFA-5.14, EN ISO 18274 |
| Base Metals Welded | Monel 400, Monel R-405, Nickel 200/201, Cu-Ni 70/30, Cu-Ni 90/10; dissimilar to C-Steel (with ERNi-1 buffer) |
| Test Certificates | EN 10204 3.1 MTC (standard) · NABL lab reports · TPI on request |
| HS Code | 83119000 |
Manufacturing Process of Monel 400 Filler Wire
Production begins with alloying nickel and copper in controlled proportions, with titanium and aluminium additions for deoxidation. The molten alloy is cast into billets, then processed through sequential cold-forming and heat-treatment stages: descaling, rough drawing, pickling, intermediate annealing, and precision fine drawing.
Each production lot undergoes chemical analysis and mechanical testing at our NABL-accredited laboratory before release. Final wire is spooled (MIG) or cut and straightened (TIG rods) and packaged in moisture-proof cartons with lot-traceable labels.
Types of Monel 400 Filler Wire and Welding Consumables
ERNiCu-7 TIG Wire (GTAW)
Straight rods, 1,000 mm length, 5 kg box. Diameters 1.6 mm, 2.4 mm, 3.2 mm, 4.0 mm. For orbital pipe welding, valve seat overlaying, and precision fabrication. Shielding: Ar or Ar/He.
ERNiCu-7 MIG Wire (GMAW)
15 kg plastic spools, 0.8–1.6 mm diameter. For high-deposition structural and shipbuilding welds. Shielding: 100% Argon. Wound to AWS D18.1 spool dimensions.
Monel 400 Coil Wire
Continuous coil form for automated MIG and SAW applications. 100 kg and 250 kg drums available for high-volume production welding.
ERNiCu-7 Cut Lengths
Custom-length cut wire for specialist SAW and electro-slag welding applications. Minimum 500 mm; maximum 3,000 mm per piece. Straightened and deburred.
Monel 400 Electrode Wire
Consumable electrode form for GMAW robotic applications. Precision layer-wound on 15 kg spools for consistent feed and low spatter.
Monel 400 Cold Heading Wire
Work-hardened wire for cold-heading applications — fastener blanks, rivets, and precision-formed components. Supplied in annealed or lightly cold-drawn condition per ASTM A493.
Monel 400 Bright Wire
Bright-annealed surface finish for electrical and instrumentation applications. Available in diameters 0.5–4.0 mm. Smooth, oxide-free surface suitable for direct use in sensor housings.
Monel 400 Spring Wire
High-tensile spring-temper wire per ASTM A313 for marine and chemical processing spring applications requiring corrosion resistance at elevated load.
Welding Processes for ERNiCu-7 Filler Wire
| Process | Abbreviation | Wire Form | Shielding Gas | Typical Application |
| Gas Tungsten Arc Welding | GTAW (TIG) | Straight rod, 1,000 mm | Ar or Ar/He | Pipe butt welds, socket welds, pressure vessel nozzles |
| Gas Metal Arc Welding | GMAW (MIG) | 15 kg spool, 0.8–1.6 mm | 100% Argon | Structural, shipbuilding, high-deposition overlay |
| Submerged Arc Welding | SAW | Coil / cut length | Flux (Ni-compatible) | Heavy-plate fabrication, pressure vessel seams |
| Plasma Arc Welding | PAW | Straight rod | Ar plasma / Ar shielding | Thin-wall tube welding, precision orbital joints |
Chemical Composition of ERNiCu-7 Filler Wire (UNS N04060)
| Grade | Ni (min) | Cu | Fe (max) | Mn (max) | C (max) | Si (max) | S (max) | Ti | Al (max) |
| ERNiCu-7 / UNS N04060 | 62.00% | Rem. | 2.50% | 4.00% | 0.15% | 1.25% | 0.015% | 1.50–3.00% | 1.25% |
Mechanical Properties of Monel 400 Filler Wire (ERNiCu-7)
| Property | Value (All-Weld-Metal, AWS A5.14) |
| Tensile Strength | ≥ 550 MPa (80,000 psi) |
| Yield Strength (0.2% offset) | ≥ 240 MPa (35,000 psi) |
| Elongation (in 50 mm) | ≥ 30% |
| Density | 8.80 g/cm³ |
| Melting Point | 1,300–1,350°C (2,370–2,460°F) |
| Service Temperature Range | −196°C to 538°C (cryogenic to elevated temp) |
| Weld Deposit Hardness | ~130–160 HB (annealed weld deposit) |
International Equivalent Grades for ERNiCu-7 Filler Wire
| Standard | Designation |
| AWS / ASME (USA) | ERNiCu-7 / A5.14 / UNS N04060 |
| DIN / Werkstoff (Germany) | 2.4367 / SNi 4060 |
| EN ISO (Europe) | EN ISO 18274 — S Ni 4060 (NiCu30MnTi) |
| BS (UK) | NA 62 |
| JIS (Japan) | YNiCu-7 |
| GOST (Russia) | СвНМЖМц 28-8.5-1.5 |
Dissimilar Metal Welding with ERNiCu-7
A significant portion of ERNiCu-7 usage is in dissimilar metal welding — joining Monel 400 to carbon steel, copper-nickel alloys, and other nickel-base metals. ERNiCu-7 is the first-choice filler for these joints because its intermediate composition bridges the metallurgical gap between nickel-copper and iron-based or copper-based alloys.
Monel 400 → Carbon Steel (P1)
Requires buffer layer. A first-pass ERNi-1 (UNS N02061) butter layer must be deposited on the carbon steel side before welding with ERNiCu-7. This prevents carbon migration from the steel into the nickel-copper weld pool, which causes carbide precipitation and weld cracking.
Monel 400 → Cu-Ni 70/30 and 90/10
ERNiCu-7 is fully compatible with copper-nickel alloys (Cu-Ni 70/30 and 90/10) without a buffer layer. This joint combination is common in naval and offshore seawater piping systems.
Monel 400 → Nickel 200/201
Direct ERNiCu-7 welding to Nickel 200 or Nickel 201 base metal is straightforward with no buffer requirement. The resulting joint retains low-temperature impact toughness down to −196°C — important for cryogenic service.
Monel 400 → Stainless Steel (Austenitic)
ERNiCu-7 can be used for Monel 400 to stainless steel transitions, though ENiCrFe-3 or ERNiCrMo-3 may be preferred where higher chromium dilution tolerance is needed. Dilution from the SS side must be controlled to below 15%.
| ⚠ Carbon Steel Buffer Layer Requirement: Never weld ERNiCu-7 directly to unbuttered carbon steel in a single pass. Carbon dilution from the steel will form nickel carbides in the HAZ, causing cracking under service stress. Always apply an ERNi-1 butter layer to the carbon steel face first. This requirement applies in ASME Section IX qualified procedures. |
Applications of Monel 400 Welding Wire (ERNiCu-7)
Oil & Gas
Wellhead component welding, sour service pipeline repair, subsea manifold fabrication, and HF acid alkylation unit weld overlay. NACE MR0175-qualified weld deposits.
Marine & Shipbuilding
Seawater piping system fabrication, heat exchanger tube-to-tubesheet welding, propulsion shaft repair, and deck hardware fabrication on naval and offshore vessels.
Chemical Processing
Reactor vessel repair, HF acid unit nozzle welding, caustic soda system piping, and chlorine production equipment — where Monel 400 weld deposits resist environments that destroy stainless steel.
Desalination & Water Treatment
MSF evaporator body repair, high-salinity piping fabrication, brine heater tube welding, and RO system pressure vessel repair in desalination plants.
Power Generation
Condenser tube-to-tubesheet welding, feedwater heater repair, and steam turbine blade repair where steam condensate corrosion and flow-assisted corrosion require Monel 400 weld metal.
Petrochemical & Refinery
EIL-approved project welding for Indian refinery expansion, crude still nozzle repair, and gas scrubbing tower overlay welding. Weld certificates to EN 10204 3.1 supplied as standard.
❄ Cryogenic Service
ERNiCu-7 weld deposits retain impact toughness down to −196°C (liquid nitrogen temperature), making them suitable for LNG piping, liquid oxygen systems, and cryogenic storage vessel repair.
Monel 400 Filler Wire Standards Compliance
| Standard | Description |
| AWS A5.14 / ASME SFA-5.14 | Specification for Nickel and Nickel-Alloy Bare Welding Electrodes and Rods — primary classification standard for ERNiCu-7 |
| EN ISO 18274 | European welding consumable standard — ERNiCu-7 classified as S Ni 4060 (NiCu30MnTi) |
| ASTM B164 | Monel Alloy 400 wire rod and bar (base metal feedstock specification) |
| ASTM A313 | Alloy 400 spring wire |
| ASTM A493 | Monel alloy 400 wire and wire rods for cold heading and cold forging |
| ASME Section IX | Welding and brazing qualifications — F-No. 42, A-No. 35 for ERNiCu-7 |
Dimension Table — Monel 400 Filler Wire
| Wire Diameter (mm) | Form | Package Weight | Length / Spool | Aperture (mm) |
| 0.8 | MIG Spool | 15 kg | — | 300 |
| 1.0 | MIG Spool | 15 kg | — | 300 |
| 1.2 | MIG Spool / TIG Rod | 15 kg / 5 kg box | 1,000 mm | 300 |
| 1.6 | TIG Rod / MIG Spool | 5 kg box / 15 kg | 1,000 mm | 300 |
| 2.0 | TIG Rod | 5 kg box | 1,000 mm | — |
| 2.4 | TIG Rod | 5 kg box | 1,000 mm | — |
| 3.2 | TIG Rod / Cut Length | 5 kg box | 1,000 mm | — |
| 4.0 | TIG Rod / Cut Length | 5 kg box | 1,000 mm | — |
Quality Testing & Certification of Monel 400 Filler Wire
Every production lot of ERNiCu-7 filler wire undergoes comprehensive destructive and non-destructive testing before dispatch. Documentation is supplied to EN 10204 3.1 as standard with all orders.
| Test | Method | Frequency |
| Chemical Analysis | OES / Wet Chemistry (NABL Lab) | Per heat |
| Tensile & Yield Strength | All-weld-metal tensile test per AWS A5.14 | Per batch |
| Elongation | 50 mm gauge length | Per batch |
| PMI (Positive Material Identification) | XRF analysis | 100% of TIG rods |
| Dimensional / Diameter Tolerance | Laser micrometer | 100% inspection |
| Surface Condition | Visual + optical microscope | 100% inspection |
| Hardness Testing | Brinell / Rockwell | Per heat |
| Third Party Inspection (TPI) | Bureau Veritas / SGS / Lloyds | On request |
Why Choose Kalpataru Piping Solutions for ERNiCu-7 Filler Wire
AWS A5.14 Compliant with WPS Data
F-No. 42 and A-No. 35 certification data supplied with every order — the exact inputs WPS engineers need.
Three Ready-to-Order Formats
TIG rod (5 kg box), MIG spool (15 kg), or cut lengths — all from ex-stock. No lead time on standard diameters 1.2–3.2 mm.
NABL Lab Certificates
All chemical analysis certificates from NABL-accredited laboratories. TPI by Bureau Veritas, SGS, or Lloyds on request.
EN 10204 3.1 MTC Standard
Third-party witnessed material test certificates issued with every order as standard — required by European and Middle East EPC projects.
Export-Ready Documentation
Commercial invoice, packing list, COO, EN 10204 3.1 MTC, and BOL all prepared in-house. Exports to 50+ countries including UAE, Saudi Arabia, UK, Germany, USA, Singapore, Australia.
Zero MOQ Policy
One TIG rod or 500 kg — same service. No minimum order. Ideal for maintenance welding and project top-up orders as well as large-volume supply contracts.
Frequently Asked Questions
What is Monel 400 filler wire used for?
Monel 400 filler wire (ERNiCu-7) is used to weld and repair components made from Monel 400 and other nickel-copper alloys. It is widely used in marine engineering, chemical processing, oil & gas, heat exchangers, pumps, valves, and desalination plants. It also supports dissimilar welding, joining Monel 400 to carbon steel, copper-nickel alloys, and Nickel 200.
What is the AWS classification for Monel 400 filler wire?
Monel 400 filler wire is classified as ERNiCu-7 under AWS A5.14 / ASME SFA-5.14. Its UNS designation is N04060 (distinct from base metal UNS N04400). For ASME Section IX WPS qualification, it is assigned F-No. 42 and A-No. 35.
What are the available forms and sizes of Monel 400 filler wire?
ERNiCu-7 is available as TIG straight rods (5 kg box, 1,000 mm length), MIG spools (15 kg, 0.8–1.6 mm diameter), and cut lengths for SAW and GMAW. Diameters: 0.8, 1.0, 1.2, 1.6, 2.0, 2.4, 3.2, 4.0 mm.
What shielding gas should be used with ERNiCu-7?
For GTAW (TIG): pure Argon or Argon/Helium blend. Helium additions improve penetration on heavy sections. For GMAW (MIG): 100% Argon. Do not use CO₂ or mixed gases with active components — these cause porosity in nickel-alloy weld pools.
Can ERNiCu-7 be used for dissimilar metal welding?
Yes. ERNiCu-7 is widely used for dissimilar welds — Monel 400 to Cu-Ni alloys, Monel 400 to Nickel 200, and Monel 400 to stainless steel. For Monel 400 to carbon steel, an ERNi-1 buffer layer on the steel side is mandatory before depositing ERNiCu-7.
What certifications does Kalpataru supply with Monel 400 filler wire?
All orders are supplied with EN 10204 3.1 MTC as standard. NABL-accredited lab reports, PMI certificates, and TPI (Bureau Veritas / SGS / Lloyds) are available on request.
What is the difference between UNS N04400 and UNS N04060?
UNS N04400 is the base metal designation for Monel 400 (pipes, plates, fasteners). UNS N04060 is the designation for ERNiCu-7 filler metal — the welding consumable. The filler includes titanium (1.50–3.00%) and elevated manganese as deoxidisers absent in the base metal. Always record N04060 on WPS documents, not N04400.
Complete Your Monel 400 Fabrication Bill of Materials
Welding engineers and procurement teams sourcing ERNiCu-7 filler wire typically need the full range of Monel 400 base materials to complete a project BOM:
- Monel 400 Pipes & Tubes
- Monel 400 Flanges (ASTM B564)
- Monel 400 Fasteners (ASTM F467)
- Monel 400 Forged Fittings
- Monel 400 Buttweld Fittings
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Technical Resource: Read the Monel 400 Welding Guide for complete preheat, interpass temperature, and PWHT parameters for ERNiCu-7 procedures. |
Request a Quote
Contact us for current pricing, EN 10204 3.1 test certificates, AWS A5.14 conformance documents, F-No./A-No. data sheets, and lead times on all ERNiCu-7 wire forms and diameters. ISO 9001 certified, EIL approved. The technical team responds within 24 hours.
