The Harm of Phosphorus and Sulfur in Welding Grade Bauxite
Welding grade bauxite has tight regulation on sulfur and phosphorus, which are detrimental to the weld. When present at high concentrations, they induce porosity and cracking, and at lower concentrations, they adversely affect the weld’s impact strength.
The Harm of Moisture in Welding Grade Bauxite
The moisture for welding grade bauxite should not exceed 0.5% because of the potential for any moisture present within the flux to reduce to hydrogen; if exposed to a welding arc, the molten weld pool absorbs the hydrogen and will induce brittleness into the weld.
The Role of Welding Grade Bauxite
Techniques for submerged arc welding require a granular flux to melt to be welding slag and gas so shield the molten weld pool from the atmosphere during the weld’s application or placement. Various proprietary compositions exist in welding flux, and in most cases, calcined bauxite is incorporated into these formulations. Calcined bauxite may make up to 25% of the welding flux in some instances.
Available Welding Grade Bauxite
| Item | CW83 | CW85 | CW87 |
| Al2O3(%) | 83.0min | 85.0min | 87.0min |
| SiO2(%) | 9.0max | 8.0max | 8.0max |
| Fe2O3(%) | 2.0max | 1.8max | 2.0max |
| K2O(%) | 0.3max | 0.5max | / |
| TiO(%) | / | / | 4.0max |
| S(%) | 0.02max | 0.02max | 0.02max |
| P(%) | 0.05max | 0.05max | 0.04max |
Available Grain Size
250mesh;325mesh; 600mesh; 800mesh; 1000mesh; 2500mesh; or as customer’s requirement.
Matthew (verified owner) –
Good quality.