AKJ218DR Flux for Submerged Arc Welding of Low Alloy Steels.
A basic flux formulated for submerged arc welding with high deposition efficiency and controlled slag properties, suitable for applications requiring good mechanical properties and low hydrogen content.
Product Overview
AKJ218DR is a basic flux for submerged arc welding, designed for use with matching solid or flux-cored wires on low alloy steels. It is intended to produce weld metal with controlled chemistry and mechanical properties, suitable for structural and pressure vessel applications.
The flux contains a high proportion of CaO, MgO, Al₂O₃, and MnO, which contribute to slag stability and weld metal cleanliness. The CaF₂ content is within the 15.0-30.0% range, supporting deoxidation and hydrogen control during welding.
Key Benefits
Controlled Slag and Good Weld Bead Profile.
The flux produces a stable slag that lifts off easily after solidification, reducing the need for post-weld cleaning and minimizing the risk of slag entrapment in subsequent passes.
Low Sulfur and Phosphorus Content.
With sulfur at 0.05% and phosphorus at 0.06%, the flux helps maintain low levels of these impurities in the weld metal, supporting improved toughness and reduced cracking susceptibility.
High Basicity for Hydrogen Control.
The high CaO+MgO+Al₂O₃+MnO content (50.0-70.0%) contributes to a basic slag system that limits hydrogen pickup during welding, supporting sound welds in high-strength and low-temperature applications.
Compatibility with Matching Wire Grades.
AKJ218DR is recommended for use with solid or flux-cored wires that match the chemical and mechanical requirements of the base metal, particularly low alloy steels.
Where It Is Used
- Submerged arc welding of low alloy steel structures.
- Pressure vessel and boiler fabrication.
- Pipeline and heavy equipment construction.
- Welding applications requiring low hydrogen and good toughness.
Who It Is For
- Welding consumable distributors supplying flux for industrial and structural welding.
- Fabricators working with low alloy steels requiring consistent weld metal properties.
- EPC contractors specifying flux for high-integrity welds in demanding environments.
Problems It Solves
- Inconsistent weld metal chemistry due to uncontrolled flux composition, to mechanical property deviations.
- High hydrogen content in welds caused by fluxes with insufficient CaF₂ or low basicity.
- Difficult slag removal and inter-run cleaning due to sticky or refractory slag.
Specifications
Published by the factory for AKJ218DR. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Element | Content |
|---|---|
| SiO₂+TiO₂ | 10.0-25.0 |
| CaO+MgO+Al₂O₃+MnO | 50.0-70.0 |
| S | 0.05 |
| P | 0.06 |
| CaF₂ | 15.0-30.0 |
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.
Size: 10-60
Technical Features
- Basic flux with CaO+MgO+Al₂O₃+MnO content of 50.0-70.0%
- CaF₂ content of 15.0-30.0%
- SiO₂+TiO₂ content of 10.0-25.0%
- Sulfur content of 0.05%
- Phosphorus content of 0.06%
- Available in particle size range of 10-60.
Use Guide
- Select the appropriate wire and flux combination based on the base metal and required mechanical properties.
- Ensure the flux is stored in a dry, sealed container and protected from moisture before use.
- Use the recommended welding parameters for the selected wire and joint configuration to achieve consistent deposition and slag control.
- Clean the flux from the weld surface between passes if required, but avoid excessive removal that may damage the weld bead.
How It Compares
AKJ218DR is a basic flux, which provides better hydrogen control and mechanical properties than rutile or mixed-type fluxes. It is not suitable for applications requiring high deposition rates with minimal slag control. For high-speed welding with less stringent toughness requirements, a rutile flux may be preferred, but at the cost of higher hydrogen content and reduced toughness.
Related Grades
Other welding flux in the same family.
AKJ218DR Questions
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Request a Quotation for AKJ218DR
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