Mica Powder is  used in the manufacturing of welding electrodes as a flux coating on the metal wire. Its very  important Part of welding Electrode, as the quality is determined by use of Mica . 
Mica is added flux with which welding electrodes are coated as arc stabilizers, weld pool protectors, fluxing agents, slag modiers, binders, extrusion agents and pigments. 

Mica coating provides two distinct types of protection & Benefits : 

  • Firstly, it serves in forming a fusible slag and a good seal at the fusion zone of the arc. 
  • Secondly, it resists the action of heat, gaseous and other surrounding atmospheric oxidation. 
  • Mainly , it is the nature of mica coating that largely determines the quality of welding electrodes.