AK-E9018-G Low-Hydrogen Sodium Electrode for Low-Alloy Steel Welding.
A low-alloy steel electrode with sodium-type coating, designed for all-position welding with high crack resistance and mechanical strength in demanding applications.
Product Overview
AK-E9018-G is a low-alloy steel electrode with a low-hydrogen sodium-type coating, suitable for all-position welding using DC reverse polarity. It is formulated for use on low-alloy steels of corresponding strength classes.
The electrode delivers high mechanical properties and excellent crack resistance, making it suitable for critical structural and pressure-containing applications where weld integrity is essential. It meets EN ISO 18275 E55 4 1NiMoB 3 2, AWS A5.5 E9018-G-H4, and GB/T 5118 E9018-G classifications.
Application: For welding of low alloy steels of corresponding strength classes.
Key Benefits
Low-Hydrogen Sodium Coating
The sodium-type coating minimizes hydrogen content in the weld metal, reducing the risk of hydrogen-induced cracking in high-strength low-alloy steels.
All-Position Welding Capability
AK-E9018-G can be used in flat, horizontal, vertical, and overhead positions, enabling consistent weld quality across complex joint geometries without changing consumables.
High Mechanical Strength
The deposited metal achieves a tensile strength of at least 620 MPa and a yield stress of at least 530 MPa, meeting the requirements for high-strength low-alloy steel applications.
Excellent Crack Resistance
The electrode's composition and low-hydrogen nature provide good resistance to cracking, particularly in restrained joints or when welding materials with higher hardenability.
Where It Is Used
- Welding of low-alloy steels in structural and pressure vessel applications.
- Fabrication and maintenance of heavy equipment and industrial plant components.
- Construction of bridges and offshore structures requiring high-strength, crack-resistant welds.
- Repair and modification of high-strength steel components in oil & gas and power generation.
Who It Is For
- Welding consumable distributors supplying low-alloy steel electrodes for industrial applications.
- Fabricators and EPC contractors working with high-strength low-alloy steels.
- Maintenance teams performing repairs on critical steel structures where weld integrity is essential.
Problems It Solves
- Cracking in welds due to high hydrogen content when using non-low-hydrogen electrodes on high-strength low-alloy steels.
- Inconsistent weld quality across different positions when switching between electrodes.
- Difficulty in meeting mechanical property requirements for high-strength low-alloy steel joints.
Specifications
Published by the factory for AK-E9018-G. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification 1 | EN ISO 18275 E55 4 1NiMoB 3 2 |
| Classification 2 | AWS A5.5 E9018-G-H4 |
| Classification 3 | GB/T 5118 E9018-G |
| Element | Content |
|---|---|
| C | 0.12 |
| Si | 0.8 |
| Mn | 0.6-1.95 |
| S | 0.03 |
| P | 0.03 |
| Ni | 0.8-1.8 |
| Mo | 0.50 |
| Cr | 0.20 |
| V | 0.05 |
| Property | Value |
|---|---|
| Tensile strength (MPa) | ≥620 |
| Yield Stress (MPa) | ≥530 |
| Elongation (%) | ≥17 |
| Impact values (J) | ≥47J/-40℃ |
| Diameter | Current range |
|---|---|
| 3.2mm | F/H-90-130A V/OH-80-110A |
| 4.0mm | F/H-140-180A V/OH-130-170A |
| 5.0mm | F/H-190-230A V/OH-180-210A |
Technical Features
- Low-hydrogen sodium-type coating for crack resistance and low hydrogen diffusion.
- Deposited metal tensile strength at least 620 MPa and yield stress at least 530 MPa.
- Elongation at least 17 percent and impact energy at least 47 J at minus 40 degrees C.
- Chemical composition includes 0.12% C, 0.8% Si, 0.6–1.95% Mn, 0.03% S, 0.03% P, 0.8–1.8% Ni, 0.50% Mo, 0.20% Cr, and 0.05% V.
- Supplied in 3.2 mm, 4.0 mm, and 5.0 mm diameters with specified current ranges for each position.
Use Guide
- Select diameter by joint thickness and welding position. For 3.2 mm: flat/horizontal 90–130 A, vertical/overhead 80–110 A.
- For 4.0 mm: flat/horizontal 140–180 A, vertical/overhead 130–170 A.
- For 5.0 mm: flat/horizontal 190–230 A, vertical/overhead 180–210 A.
- Use DC reverse polarity only. Ensure the electrode is dry before use; re-bake if exposed to moisture.
- Clean joint surfaces from rust, oil, paint, and moisture before welding to prevent porosity and cracking.
How It Compares
AK-E9018-G and E9018-B1 are both low-alloy electrodes with low-hydrogen coatings, but AK-E9018-G uses a sodium-type coating, which requires DC reverse polarity and offers better crack resistance in high-strength steels. Basic-coated electrodes like E9018-B1 are also low-hydrogen but may require stricter storage and handling. Cellulosic electrodes provide deeper penetration but higher hydrogen content, making them unsuitable for high-strength or crack-sensitive applications.
Related Grades
Other welding electrodes in the same family.
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