AK-607Q Low-Hydrogen Sodium Electrode for High-Toughness Bridge Steel Welding.
An all-position, ultra-low hydrogen electrode with high toughness for critical low-alloy steel structures, designed for demanding applications like Q420qE bridge components.
Product Overview
AK-607Q is a low-hydrogen sodium type covered electrode for manual metal arc welding, formulated for all-position welding with DC reverse polarity. It delivers high toughness and low hydrogen content, meeting the requirements for critical structural applications.
The electrode is classified under EN ISO 18275-A E 55 5 Mn1 NiMo B 4 2, AWS A5.5 E9015-D1, and GB/T 5118-1995 E6015-G. It is specifically intended for welding important low-alloy steel Q420qE in bridge structures, where mechanical performance and crack resistance are essential.
Application: lt is used for bridge welding structures such as important low-alloy steel Q420qE.
Key Benefits
Ultra-Low Hydrogen Content
The sodium-type coating minimizes hydrogen in the weld metal, reducing the risk of hydrogen-induced cracking in high-strength steels and thick-section welds.
High Toughness at Low Temperatures.
The deposited metal achieves impact values of at least 60 J at minus 40 degrees C, ensuring reliable performance in cold environments.
All-Position Welding Capability
AK-607Q can be used in flat, horizontal, vertical, and overhead positions, allowing consistent weld quality across complex joint geometries.
High Strength and Ductility.
The weld metal has a tensile strength of at least 610 MPa and yield stress of at least 500 MPa, with elongation of at least 20 percent, meeting the demands of high-stress structural joints.
Where It Is Used
- Bridge structures made from low-alloy steel Q420qE.
- Critical structural components requiring high toughness and low hydrogen.
- Welding in thick-section or high-stress areas where crack resistance is essential.
- All-position welding in fabrication and field erection of heavy steel structures.
Who It Is For
- Welding consumable distributors supplying high-performance electrodes for structural steel.
- Bridge fabricators and EPC contractors working with Q420qE and similar low-alloy steels.
- Fabrication shops requiring certified, consistent consumables for critical welds.
Problems It Solves
- Weld cracking in high-strength low-alloy steels due to hydrogen content in the weld metal.
- Inadequate toughness in low-temperature service environments.
- Lack of consistent, certified consumables for critical structural welding from a single supplier.
- Need for a single electrode covering all positions without compromising mechanical properties.
Specifications
Published by the factory for AK-607Q. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification 1 | EN ISO 18275-A E 55 5 Mn1 NiMo B 4 2 |
| Classification 2 | AWS A5.5 E9015-D1 |
| Classification 3 | GB/T 5118-1995 E6015-G |
| Element | Content |
|---|---|
| C | 0.10 |
| Si | 0.60 |
| Mn | 1.0-1.6 |
| S | 0.015 |
| P | 0.020 |
| Ni | 0.8-1.7 |
| Mo | 0.1-0.4 |
| Property | Value |
|---|---|
| Tensile strength (MPa) | ≥610 |
| Yield Stress (MPa) | ≥500 |
| Elongation (%) | ≥20J |
| Impact values (J) | ≥60J/-40℃ |
| Diameter | Current range |
|---|---|
| 2.5mm | F/H-70-110A V/OH-50-80A |
| 3.2mm | F/H-90-130A V/OH-80-110A |
| 4.0mm | F/H-140-180A V/OH-130-170A |
Technical Features
- Low-hydrogen sodium type coating with DC reverse polarity requirement.
- Deposited metal tensile strength at least 610 MPa, yield stress at least 500 MPa.
- Elongation at least 20 percent, impact energy at least 60 J at minus 40 degrees C.
- Chemical composition: C 0.10%, Si 0.60%, Mn 1.0-1.6%, S 0.015%, P 0.020%, Ni 0.8-1.7%, Mo 0.1-0.4%
- Available in 2.5 mm, 3.2 mm, and 4.0 mm diameters.
Use Guide
- Use DC reverse polarity for stable arc and proper penetration.
- Select diameter by joint thickness and set current within the recommended range: 2.5 mm (F/H: 70-110 A, V/OH: 50-80 A), 3.2 mm (F/H: 90-130 A, V/OH: 80-110 A), 4.0 mm (F/H: 140-180 A, V/OH: 130-170 A).
- Keep electrodes dry in sealed packaging; re-dry if exposed to moisture before use.
- Clean joint surfaces from rust, oil, paint, and moisture before welding to avoid defects.
How It Compares
AK-607Q and E9015-D1 both meet AWS A5.5 E9015-D1 and are low-hydrogen sodium electrodes for high-strength steels. AK-607Q is specifically formulated for bridge structures and Q420qE steel, with a defined chemical composition and mechanical properties. Other E9015-D1 electrodes may vary in toughness and hydrogen content. For applications requiring lower hydrogen and higher toughness in thick-section or low-temperature service, AK-607Q is a suitable choice.
Related Grades
Other welding electrodes in the same family.
AK-607Q Questions
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