Nickel ERNICU-7
Standard :AWS A5.14
Characteristic:Monel 400 nickel based alloy
Sizes:Φ2.5mm,Φ4.0mm,etc.
Products Description
ERNiCu-7 is a high-performance nickel-copper alloy welding material that complies with AWS A5.14 (ERNiCu-7) and ISO 18274 standards and is designed for MIG, TIG, and SAW processes. It is mainly composed of nickel (≥62%) and copper (28-32%), supplemented by a small amount of iron, manganese, and titanium. It has excellent corrosion resistance and high strength, and is suitable for copper alloy welding and dissimilar metal joining under harsh working conditions.
Product characteristics
Corrosion resistance
Anti-seawater erosion (resistant to chloride ions, pitting, stress corrosion cracking)
Tolerant to non-oxidizing acids such as sulfuric acid and hydrochloric acid and alkaline environments.
Process adaptability
Supports full process coverage of MIG (high-efficiency cladding), TIG (precision welding), and SAW (thick plate deep penetration welding).
Stable arc, good molten pool fluidity, less spatter, suitable for all-position welding.
Dissimilar metal connection
Reliable welding of nickel-copper alloy←→nickel 200, copper-nickel alloy (such as 90/10 Cu-Ni).
Steel-based cladding: Nickel 208 (ERNi-1) must be used as a transition layer in advance to avoid brittle phases caused by iron dilution.
Mechanical properties
| Item | Tensile Strength | Yield strength | Elongation |
| Indicator | 76,000 psi | 51,000 psi | 34% |
The mechanical properties of ERNiCu-7 deposited metal (high strength, high toughness) make it an ideal choice under harsh working conditions, which not only ensures the structural integrity of the welded joint, but also avoids the risk of brittle failure through ductility. These characteristics are particularly suitable for fields such as marine, chemical, and energy that have extremely high requirements for safety and durability.
Chemical composition (%)
| Item | C | Mn | Fe | P | S | Si | Cu | Ni | AI | Ti |
| Requirements | 0.15 | 4 | 2.5 | 0.02 | 0.015 | 1.25 | Rem | 62.0-69.0 | 1.25 | 1.5-3.00 |
| Example Value | 0.15 | 4 | 2.5 | 0.02 | 0.015 | 1.25 | Rem | ≤0.30 | 1.25 | 1.5-3.00 |
Application
| Field | Typical equipment | Key performance requirements | ERNiCu-7 advantages |
| Marine Engineering | Seawater pump valve, propeller shaft | Resistant to chloride ion corrosion and dynamic load | High elongation (34%) absorbs impact energy |
| Chemical Equipment | Reactor, acid medium pipeline | Resistant to non-oxidizing acids and thermal fatigue | Ni-Cu composition is acid resistant and high temperature stable |
| Energy and Power | Condenser, LNG storage tank | High pressure strength, low temperature toughness | Tensile strength 524 MPa, low temperature ductility |
Products test
Notes on use
Avoid welding in a humid sea breeze environment, and build a wind and moisture proof shed if necessary.
Anti-corrosion coating (such as epoxy resin coating) must be applied within 24 hours after welding.
Preheat to 50-80°C (base material temperature) before welding to prevent the risk of hydrogen embrittlement in low temperature environments.
If the weld cracks, stop the operation immediately and check for problems with heat input, interlayer temperature or parent material cleaning.
If a person is poisoned, move to a ventilated area. If inhalation of smoke causes discomfort, seek medical attention and explain exposure to nickel compounds.
Welding process(Take Φ3.2mm welding rod as an example)
| Process | Current type | Current range | Voltage range | Welding speed |
| TIG | DCEN | 80-120A | 10-14V | 80-150 mm/min |
| MIG | DCEP | 140-180A | 22-26V | 200-350 mm/min |
| SAW | AC/DC+ | 300-500A | 28-32V | 400-600 mm/min |
FAQ
Q: What is ERNiCu 7?
A: ERNiCu-7 is a specialized filler metal for joining nickel-copper alloys, offering robust corrosion resistance and mechanical integrity in harsh environments.
Q: Can it be used for automated welding?
A: Yes, but you need to adjust the parameters according to the characteristics of the equipment and ensure the stability of wire feeding and protective gas.
Q: How to obtain detailed technical parameter table?
A: Please contact us or visit our official website to download product brochures
How To Order
| TYPE： | ERNICU-7 | ERNICU-7 | ERNICU-7 |
| Material： | Nickel Alloy Welding Wire | Nickel Alloy Welding Wire | Nickel Alloy Welding Wire |
| Size : | Diameter:Φ2.5mm,Φ4.0mm,etc. | Diameter: Φ3.2mm,Φ4.0mm,etc. | Diameter:,Φ2.5mm,Φ3.2mm,etc. |
| Length:350mm,450mm,etc | Length:350mm,450mm,etc | Length:350mm,450mm,etc | |
| Torelance: | (-0.04/-0.01)mm | (-0.04/-0.01)mm | (-0.04/-0.01)mm |
| Packing: | 1kg,2.5kg,5kg/inner box | 20kg/carton | 1000kg/pallet |
| M.O.Q: | 100.00kgs | 100.00kgs | 100.00kgs |
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