AK-W707Ni Low-Temperature Steel Electrode for -70℃ Service.
A low-hydrogen sodium-coated electrode for all-position welding of low-temperature steels, delivering impact toughness at -70℃ with Ni-modified deposited metal.
Product Overview
AK-W707Ni is a low-temperature steel electrode with a low-hydrogen sodium coating containing nickel, designed for use with DC reverse polarity and all welding positions.
The deposited metal maintains impact toughness of at least 27 J at -70℃, making it suitable for critical low-temperature applications in cryogenic and arctic environments.
It meets EN ISO 2560-B:E 7015-C 1, AWS A5.5 E7015-C1, and GB/T 5117 E5015-N5 classifications, and is intended for welding low-temperature steels such as 09Mn2V, 06MnVAl, and 3.5Ni steel.
Application: Welding low temperature steel structures such as 09Mn2V, 06MnVAl and 3.5Ni steel working at -70℃.
Key Benefits
Impact Toughness at -70℃.
The deposited metal achieves a minimum impact value of 27 J at -70℃, ensuring reliable performance in extreme cold environments without brittle fracture.
Low-Hydrogen Sodium Coating
The low-hydrogen sodium coating reduces hydrogen content in the weld metal, minimizing the risk of cold cracking in high-strength low-temperature steels.
All-Position Welding Capability
AK-W707Ni can be used in flat, horizontal, vertical, and overhead positions, allowing one electrode to cover multiple joint orientations without retooling.
Ni-Modified Deposition for Low-Temperature Performance.
The addition of 2.0-2.75% nickel in the deposited metal enhances toughness and ductility at low temperatures, supporting service in cryogenic and arctic conditions.
Where It Is Used
- Welding low-temperature steel structures such as 09Mn2V, 06MnVAl, and 3.5Ni steel.
- Fabrication and repair of cryogenic storage tanks and pipelines.
- Structural components operating at -70℃ in arctic or offshore environments.
- Critical joints in pressure vessels and transport systems exposed to extreme cold.
Who It Is For
- Welding consumable distributors supplying low-temperature welding solutions.
- Fabricators of cryogenic and arctic-grade steel structures.
- Maintenance teams working on low-temperature equipment in oil & gas and petrochemical facilities.
- EPC contractors requiring certified electrodes for low-temperature code-compliant welds.
Problems It Solves
- Achieving required impact toughness at -70℃ in welds made on low-temperature steels like 09Mn2V and 3.5Ni steel.
- Avoiding cold cracking in high-strength low-temperature steels due to hydrogen in the weld metal.
- Using a single electrode for all welding positions on complex structures without changing consumables.
Specifications
Published by the factory for AK-W707Ni. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification 1 | EN ISO 2560-B:E 7015-C 1 |
| Classification 2 | AWS A5.5 E7015-C1 |
| Classification 3 | GB/T 5117 E5015-N5 |
| Element | Content |
|---|---|
| C | 0.12 |
| Si | 0.6 |
| Mn | 1.25 |
| S | 0.030 |
| P | 0.030 |
| Ni | 2.0-2.75 |
| Property | Value |
|---|---|
| Tensile strength (MPa) | ≥540 |
| Yield Stress (MPa) | ≥440 |
| Elongation (%) | ≥17 |
| Impact values (J) | ≥27J/-70℃ |
| Diameter | Current range |
|---|---|
| 2.5mm | 60-100A |
| 3.2mm | 80-130A |
| 4.0mm | 140-200A |
| 5.0mm | 180-240A |
Technical Features
- Low-hydrogen sodium coating with 2.0-2.75% Ni in deposited metal.
- Deposited metal tensile strength at least 540 MPa, yield stress at least 440 MPa, elongation at least 17%
- Impact toughness at least 27 J at -70℃.
- Meets EN ISO 2560-B:E 7015-C 1, AWS A5.5 E7015-C1, and GB/T 5117 E5015-N5 classifications.
- Available in 2.5 mm, 3.2 mm, 4.0 mm, and 5.0 mm diameters with specified current ranges.
Use Guide
- Select diameter by joint thickness and set current within the recommended range: 2.5 mm (60-100 A), 3.2 mm (80-130 A), 4.0 mm (140-200 A), 5.0 mm (180-240 A).
- Use DC reverse polarity (DCEN) for stable arc and consistent penetration.
- Keep electrodes dry in sealed packaging; re-bake if exposed to moisture before use.
- Clean joint surfaces from rust, oil, paint, and moisture before welding to prevent porosity and cracking.
How It Compares
AK-W707Ni and E7015 both belong to the low-hydrogen sodium-coated electrode family and are suitable for all positions. However, AK-W707Ni contains nickel to enhance low-temperature impact toughness, making it specifically suited for service at -70℃. Standard E7015 electrodes without nickel may not meet the same impact requirements at such low temperatures. For applications requiring even higher toughness or different chemical compatibility, other nickel-modified or alloyed electrodes may be considered.
Related Grades
Other welding electrodes in the same family.
AK-W707Ni Questions
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