AK-ENiCu-7 Low Hydrogen Ni-Cu Alloy Electrode for Offshore and Petrochemical Welding.
A low hydrogen manual electrode with Ni-Cu composition designed for crack-resistant welding of Monel alloys and dissimilar joints, delivering stable arc and consistent mechanical properties in demanding environments.
Product Overview
AK-ENiCu-7 is a low hydrogen manual welding electrode with a nominal composition of 66% Ni-30% Cu-3% Mn-1% Fe, classified under EN ISO 14172-E Ni 4060, AWS A5.11, ENiCu-7, GB/T 13814, and ENi4060. It is specifically formulated for welding nickel-copper alloys such as Monel 400 and Monel 404, as well as for dissimilar welding between steel and Ni-Cu alloy or buildup welding on steel surfaces.
The addition of controlled amounts of manganese and titanium helps reduce the risk of hot cracking and porosity, while ensuring a stable arc, smooth weld bead appearance, minimal spatter, and easy slag removal. The deposited metal maintains consistent mechanical properties and exhibits excellent resistance to blowholes, making it suitable for critical applications in offshore engineering, petrochemical plants, and power generation facilities.
Application: Suitable for welding Ni-Cu alloy,such as Monel400/404. ASTMB127 and etc;Can also be used for dissimilar welding of steel and Ni-Cu alloy, or buildup welding on steel surface;Used in heat exchanger, pipe, vessel and evaporator in offshore engineering. Petrochemical industry,and power plant industry.
Key Benefits
Low Hydrogen for Crack Resistance.
The low hydrogen nature of AK-ENiCu-7 reduces the risk of hydrogen-induced cracking, particularly important in high-stress or thick-section welds in corrosive environments.
Stable Arc and Clean Weld Appearance.
The electrode provides a stable arc across the recommended current range, resulting in a smooth, well-shaped weld bead with minimal spatter and easy slag removal.
Resistance to Blowholes and Hot Cracking.
The controlled levels of Mn and Ti effectively suppress porosity and hot cracking, ensuring sound welds even in challenging joint configurations.
Consistent Mechanical Properties
The deposited metal achieves a tensile strength of at least 480 MPa and elongation of at least 22 percent, meeting the requirements for structural integrity in high-demand applications.
Where It Is Used
- Welding of Monel 400 and Monel 404 nickel-copper alloys.
- Dissimilar welding between steel and Ni-Cu alloy.
- Buildup welding on steel surfaces for corrosion resistance.
- Fabrication and repair of heat exchangers, pipes, vessels, and evaporators in offshore and petrochemical projects.
- Critical welds in power plant and chemical processing equipment.
Who It Is For
- Welding consumable distributors supplying specialty alloys for industrial fabrication.
- Offshore engineering contractors working with corrosion-resistant alloys.
- Petrochemical and power plant maintenance teams requiring reliable dissimilar metal welding solutions.
- Fabricators of heat exchangers and pressure vessels using Ni-Cu materials.
Problems It Solves
- Achieving crack-free welds in Ni-Cu alloys and dissimilar joints where hot cracking and porosity are common risks.
- Maintaining consistent mechanical properties and weld soundness in high-stress, corrosive environments.
- Reducing rework caused by blowholes and poor bead appearance in critical welds.
- Sourcing a single, certified electrode for multiple Ni-Cu alloy and dissimilar welding applications.
Specifications
Published by the factory for AK-ENiCu-7. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification 1 | EN ISO 14172-E Ni 4060 |
| Classification 2 | AWS A5.11 |
| Classification 3 | ENiCu-7 |
| Classification 4 | GB/T 13814 |
| Classification 5 | ENi4060 |
| Element | Content |
|---|---|
| C | ≤0.15 |
| Si | ≤1.50 |
| Mn | ≤4.0 |
| S | ≤0.015 |
| P | ≤0.02 |
| Fe | ≤2.50 |
| Ni | 62-69 |
| Cu | 27-34 |
| Ti | 1.0 |
| Property | Value |
|---|---|
| Tensile strength (MPa) | ≥480 |
| Yield Stress (MPa) | —— |
| Elongation (%) | ≥22 |
| Impact values (J) | —— |
Technical Features
- Low hydrogen manual electrode with Ni-Cu composition, nominal 66% Ni-30% Cu-3% Mn-1% Fe.
- Complies with EN ISO 14172-E Ni 4060, AWS A5.11, ENiCu-7, GB/T 13814, and ENi4060 standards.
- Chemical composition: C ≤0.15%, Si ≤1.50%, Mn ≤4.0%, S ≤0.015%, P ≤0.02%, Fe ≤2.50%, Ni 62-69%, Cu 27-34%, Ti 1.0%
- Deposited metal tensile strength ≥480 MPa, elongation ≥22%
- Stable arc, low spatter, easy slag removal, excellent resistance to blowholes.
Use Guide
- Select electrode diameter based on joint thickness and welding position; ensure current is within the recommended range for the selected size.
- Clean joint surfaces thoroughly from oil, grease, moisture, rust, and scale before welding to prevent contamination and porosity.
- Store electrodes in sealed packaging and re-bake if exposed to moisture; follow standard reconditioning procedures for low hydrogen electrodes.
- Remove slag completely between passes to avoid entrapment and ensure soundness in multi-pass welds.
How It Compares
AK-ENiCu-7 is a low hydrogen Ni-Cu electrode suitable for welding Monel 400 and 404, as well as dissimilar joints. It differs from standard mild steel electrodes like E6013 in composition and performance, offering superior corrosion resistance and mechanical properties in nickel-copper systems. Compared to basic-coated electrodes for low-alloy steels, AK-ENiCu-7 is not intended for carbon steel but is optimized for high-nickel, high-copper alloys where crack resistance and weld integrity are critical.
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Technical background on this grade from the AKWELD knowledge centre.
Related Grades
Other welding electrodes in the same family.
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