Learn how to establish an SJ601 redrying procedure based on product instructions, storage history, oven control, WPS, and moisture risk.
SJ601 is a sintered submerged arc welding flux. If the product has absorbed moisture, controlled redrying may be required before use. A universal temperature and holding time should not be assumed without the manufacturer's technical instructions.
Why May Redrying Be Needed?
Moisture can enter through damaged packaging, humid storage, open hoppers, condensation, or uncontrolled flux recovery. Excess moisture may contribute to hydrogen risk, porosity, feeding changes, or inconsistent slag behavior.
What Should a Redrying Procedure Specify?
- Maximum flux depth in the tray
- Oven temperature
- Holding time after reaching temperature
- Oven calibration
- Loading and unloading method
- Storage after drying
- Maximum number of redrying cycles
- Traceability of dried material
Can Any Oven Be Used?
The oven should provide uniform, controlled heating without contaminating the flux. Domestic ovens, open flames, and uncontrolled heating are unsuitable.
What Happens After Redrying?
Transfer the material to a clean, dry holding container or heated hopper as required. Protect it from humid air and do not mix it with unidentified or damp recovered flux.
Can Excessive Heating Damage Flux?
Yes. Overheating or repeated uncontrolled cycles may alter binder condition, particle strength, fines generation, or welding behavior.
Dayang Welding recommends requesting the specific SJ601 storage and redrying instructions supplied with the product rather than copying conditions used for another flux.
