Flux coating layer
Flux coating is a layer on the stick electrode that vaporizes to form shielding gases and remove slag.
Physicochemical mechanism of action
The flux coating forms on the electrode through evaporation of liquids or solids. This evaporation produces gases that create a protective layer, shielding the surrounding medium from corrosion. Additionally, slag is lifted, improving conductivity.
Metallurgical relevance & welding risks
Missing or insufficient flux coating can lead to electrode corrosion and reduced conductivity. This can cause electrode wear and poor weld results. Furthermore, incomplete slag removal can cause porosity in the weld, impairing strength and toughness.
Workshop practice & procedures
Make sure the electrode is properly coated before starting to weld. Check the coating regularly and replace it when necessary. Ensure the flux coating evaporates enough to form a dense shielding layer. Always use high-quality flux for optimal results.