Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Monel 400 Welding Rod ERNiCu-7 — AWS A5.14 / ASME SFA-5.14
Monel 400 welding rod (classification ERNiCu-7, trade name Monel Filler 60) is the matching consumable for joining Monel 400 base material to itself and to a wide range of nickel and copper alloys. TorqBolt supplies ERNiCu-7 per AWS A5.14 and ASME SFA-5.14 in TIG (GTAW), MIG (GMAW), and submerged-arc form. Diameters 0.030″ (0.8mm) through 1/8″ (3.2mm) for TIG; 0.035″ through 1/16″ (1.6mm) for MIG; spool weights to 25 kg.
Classification & Chemistry
| Property | ERNiCu-7 |
|---|---|
| AWS classification | ERNiCu-7 |
| UNS designation | N04060 |
| Ni | 62 - 69 |
| Cu | remainder |
| Fe | 2.5 max |
| Mn | 3.5 - 4.5 |
| Ti | 1.5 - 3.0 |
| C | 0.15 max |
Titanium and manganese additions deoxidize the weld pool and tie up carbon to prevent porosity.
Deposit Mechanical Properties
- Tensile (as-welded): 70 ksi / 480 MPa min
- Elongation: 30% min in 4D
- Hardness: HRB 75-85
- Bend test: 180° guided bend without cracking
Welding Processes Supported
- GTAW (TIG): diameters 1/16 - 1/8″, argon shielding 99.99% pure. Most common for thin-wall pipe and pressure-vessel joints.
- GMAW (MIG): 0.035 - 1/16″ spool wire, argon or argon-helium shielding. Faster deposition for thicker sections.
- SAW (sub-arc): 1/16 - 3/16″ wire with matching flux for thick-wall pressure-vessel cladding.
Joining Other Materials
ERNiCu-7 is the recommended filler when joining Monel 400 to:
- Monel 400 (matching)
- Nickel 200 / 201 (also accepts ERNi-1)
- Cupronickel 70/30 / 90/10 (also accepts ERCuNi)
- Copper
- Carbon steel (with buttered transition pass)
- Stainless steel (with ERNiCrMo-3 buffer)
Applicable Standards
- AWS A5.14 - nickel and nickel-alloy bare welding rods and electrodes
- ASME SFA-5.14 - ASME boiler-code adoption of AWS A5.14
- ASME Section IX - welder qualification
- NACE MR0175 / ISO 15156 - sour-service applicable on K-500 base, not Monel 400 base
FAQs
Why does ERNiCu-7 contain titanium when Monel 400 base doesn't?
Titanium deoxidizes the weld pool and ties up carbon as TiC, preventing porosity and grain-boundary carbides. The base alloy doesn't need titanium because the rolling and annealing process refines the structure mechanically; the weld solidification doesn't have that opportunity.
Can I weld Monel 400 with stainless filler ER309?
Not recommended for service applications. ER309 (chromium-bearing) creates a chromium-rich weld bead that will fail in HF service and may pit in seawater. Always use ERNiCu-7 for service welds; stainless filler is only acceptable for non-corrosive structural welds.
What preheat is required for Monel 400 welding?
None for thin sections (< 25mm). For thick sections (> 25mm), preheat to 100°C minimum to drive off moisture and prevent porosity. Interpass temperature controlled at < 175°C to prevent grain growth.
What's the shelf life of ERNiCu-7 spool wire?
Indefinite if stored sealed in dry conditions (< 60% humidity). Once opened, use within 6 months. Re-baking is not required for solid wire (unlike flux-cored or stick consumables).
Related
- Monel 400 welding procedure
- Monel 400 wire
- Monel 400 pipe
- Monel 400 fittings
- UNS N04400 specification
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