Domestic Market
ER NiCu-7 is a nickel-copper alloy welding wire, typically containing about 65% Nickel and 30% Copper with controlled amounts of Iron and Manganese. It is specially developed for welding Monel-type alloys and other nickel-copper materials. This filler metal provides excellent resistance to seawater corrosion, salts and many chemicals. It produces strong, ductile weld deposits with good crack resistance.
Key Features and Benefits
ER NiCu-7 is designed to deliver strong, corrosion-resistant welds in demanding marine and chemical environments. Its balanced nickel-copper composition ensures reliable performance where durability truly matters.
- Excellent Corrosion Resistance: Performs exceptionally well in seawater, brine and salt-rich conditions, helping extend service life in marine applications.
- Strong and Ductile Weld Metal: Provides good tensile strength with high elongation, allowing the joint to handle stress and vibration without cracking.
- Low Crack Sensitivity: Carefully controlled chemistry reduces the risk of hot cracking during welding.
- Smooth and Stable Arc: Offers controlled metal transfer with minimal spatter, resulting in clean and uniform weld beads.
- Dissimilar Metal Welding Capability: Suitable for joining nickel-copper alloys to certain steels in maintenance and repair work.
These benefits make ER NiCu-7 a trusted choice for critical fabrication and repair jobs where corrosion resistance and strength cannot be compromised.
Specifications
ER NiCu-7 is produced under strict quality standards to deliver consistent chemical composition, dependable mechanical strength and excellent corrosion resistance, making it a reliable choice for marine, offshore and chemical industry applications.
| Parameter | Specification / Typical Value |
|---|---|
| AWS Classification | ERNiCu-7 |
| ASME Specification | SFA 5.14 |
| Welding Process | GTAW (TIG), GMAW (MIG) |
| Polarity | DC+ |
| Typical Chemical Composition (%) | Nickel (Ni): 62–69 |
| Copper (Cu): Balance | |
| Iron (Fe): ≤ 2.5 | |
| Manganese (Mn): ≤ 4.0 | |
| Silicon (Si): ≤ 1.25 | |
| Carbon (C): ≤ 0.15 | |
| Titanium (Ti): 1.5–3.0 | |
| Tensile Strength | ≥ 480–550 MPa |
| Yield Strength | ≥ 240 MPa |
| Elongation (A5) | ≥ 30% |
| Available Sizes | 0.8 mm to 3.2 mm (varies by supplier) |
| Form | Spools (MIG), Straight lengths (TIG) |
These specifications make ER NiCu-7 suitable for welding nickel-copper alloys in marine, offshore and chemical environments where corrosion resistance and strength are essential.
Properties
ER NiCu-7 offers dependable mechanical properties and corrosion resistance for long-term performance.
- Excellent Seawater Resistance: Provides long-lasting protection against saltwater corrosion. It is suitable for marine shafts, propellers, pumps and condenser tubes.
- Strong Mechanical Performance: Maintains good tensile strength and ductility. The weld metal can absorb stress without cracking, even under dynamic loading.
- Good Low-Temperature Toughness: Retains impact strength in cold environments. This makes it suitable for offshore and sub-zero service conditions.
- Uniform Weld Appearance: Produces smooth weld beads with minimal spatter. The controlled weld pool helps achieve neat and consistent joints.
These properties make ER NiCu-7 a reliable solution for industries where corrosion and strength cannot be compromised.
Related Products
If you need alternatives to ER NiCu-7, explore the dependable options:
- ER Ni-1: A nearly pure nickel filler wire used for welding pure nickel and joining nickel to steel. It performs well in reducing chemical environments and is suitable for cladding work.
- ER NiCrMo-3: Commonly used with high-performance alloys like Inconel 625. It offers excellent resistance to heat, pitting and crevice corrosion.
- ER NiCrMo-4: Suitable for aggressive chemical conditions and alloys similar to Hastelloy C-276.
- ER NiFe-CI: Designed for welding cast iron, delivering machinable welds with good crack resistance.
Each of these options is built for specific applications, helping you choose the right filler metal for strength, durability and long-term performance.
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