AK-50QNH Low-Alloy Steel Gas Shielded Solid Welding Wire for Corrosion-Resistant Bridge Steel.
A solid welding wire designed for high atmospheric corrosion resistance and excellent mechanical properties in critical bridge applications using weathering steels like Q355NH.
Product Overview
AK-50QNH is a low-alloy steel gas shielded solid welding wire formulated for use with shielding gas in manual and automated welding processes. It is intended for joining important bridge structures made from corrosion-resistant steels such as Q355NH.
The wire delivers excellent atmospheric corrosion resistance in the weld metal, which extends service life under various climatic conditions. Mechanical properties of the deposited metal meet the demands of structural applications, with good crack resistance to reduce the risk of defects during service.
Application: Used for welding of important bridge corrosion-resistant steel such as Q355NH, etc.
Key Benefits
Atmospheric Corrosion Resistance
The weld metal produced by AK-50QNH exhibits enhanced resistance to atmospheric corrosion, making it suitable for outdoor bridge structures exposed to moisture, salt, and fluctuating temperatures.
Excellent Mechanical Properties
The deposited metal achieves strong tensile and ductile performance, with a balanced chemical composition that supports high strength and toughness in service.
Good Crack Resistance
The wire's composition and process stability reduce the likelihood of solidification and hydrogen-induced cracking, especially in thicker sections or under restraint.
Compatibility with Weathering Steel.
Designed specifically for welding Q355NH and similar weathering steels, ensuring the weld metal matches the base metal's corrosion behavior and long-term performance.
Where It Is Used
- Welding of critical bridge structures using weathering steel such as Q355NH.
- Structural fabrication in environments with variable or harsh weather conditions.
- Applications requiring long-term durability without painting or coating.
Who It Is For
- Bridge fabricators and contractors working with weathering steel.
- Steel structure manufacturers needing corrosion-resistant welds for outdoor use.
- Welding distributors supplying consumables for infrastructure projects.
Problems It Solves
- Mismatch in corrosion behavior between weld metal and base metal in weathering steel joints, to premature degradation.
- Lack of consistent mechanical performance and crack resistance in welds exposed to cyclic loading and environmental stress.
- Difficulty sourcing a single wire that meets both the chemical and performance requirements for bridge-grade weathering steel.
Specifications
Published by the factory for AK-50QNH. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification | GB/T 8110 ER50-G |
| Element | Content |
|---|---|
| C | 0.10 |
| Mn | 0.6-1.20 |
| P | 0.025 |
| S | 0.020 |
| Si | 0.60 |
| Cu | 0.20-0.50 |
| Ni | 0.20-0.60 |
| Cr | 0.30-0.90 |
Mechanical property data for this grade is not published on the factory datasheet. Ask our technical team for the test record before you qualify it.
| Diameter | Current range |
|---|---|
| 0.8mm | F/H-50-180A / V(OH)-50-100A |
| 1.0mm | F/H-80-250A / V(OH)-70-160A |
| 1.2mm | F/H-100-360A / V(OH)-80-220A |
Technical Features
- Formulated to GB/T 8110 ER50-G standard for low-alloy steel gas shielded solid welding wire.
- Chemical composition includes controlled levels of Cu (0.20-0.50%), Ni (0.20-0.60%), Cr (0.30-0.90%), and Si (0.60%) for enhanced atmospheric corrosion resistance.
- Carbon content at 0.10% to balance strength and weldability.
- Phosphorus content at 0.025% and sulfur at 0.020% to improve toughness and reduce hot cracking risk.
- Available in 0.8 mm, 1.0 mm, and 1.2 mm diameters with specified current ranges for flat/horizontal and vertical/overhead positions.
Use Guide
- Select wire diameter based on joint thickness and welding position: 0.8 mm for thin sections, 1.0 mm for medium, 1.2 mm for thicker materials.
- Use the recommended current ranges: 0.8 mm – 50-180 A flat/horizontal, 50-100 A vertical/overhead; 1.0 mm – 80-250 A flat/horizontal, 70-160 A vertical/overhead; 1.2 mm – 100-360 A flat/horizontal, 80-220 A vertical/overhead.
- Ensure shielding gas is clean and dry, and maintain proper gas flow rate to avoid porosity.
- Clean base metal surfaces from oil, rust, paint, and moisture before welding to prevent defects.
How It Compares
AK-50QNH is a solid wire designed for weathering steel applications, differing from standard ER50-6 wires which lack the specific alloying elements (Cu, Ni, Cr) needed for atmospheric corrosion resistance. It is not intended for use with non-weathering steels where lower alloy content is sufficient. For high-strength low-alloy steels without corrosion requirements, other ER50-G variants may be more cost-effective.
Related Grades
Other welding wire in the same family.
AK-50QNH Questions
What standard does AK-50QNH meet?
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Can I get a full catalogue and packing details before ordering?
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Can we test AK-50QNH before placing a production order?
Request a Quotation for AK-50QNH
Send the diameter, the quantity and the destination port. Our technical team replies with packing, pricing and the data you need to qualify the grade.