прокаливают порошок слюды для сварочных электродов

calcined mica powder application : welding rods ,welding materials detailed application In the manufacture of welding electrodes a core of steel wire is coated uniformly with a 'flux' comprising mica as a lagging compound. Mica is added to the 'flux' with which welding electrodes are coated as binders, extrusion agents and pigments to aid slag formation, weldpool protection and arc stabilisation. The mica coating provides two distinct types of protection to the welding rods. Firstly, it serves in forming a fusible slag and a good seal at the fusion zone on the arc. Secondly, it resists the action of heat, gaseous and other surrounding atmospheric oxidization. In fact, it is the nature of mica coating that largely determines the quality of a welding electrodes.