Tungsten Carbide Block

electro spark coating is a pulsed-micro welding process for depositing a hard wear resistant electrode material on a wide range of metallic substrates. The material to be coated serves as the anode while the cathode is the work piece itself. Striking an arc between the consumable anode and the job causes some of the electrode material to melt instantaneously at the point of contact and deposits on the surface of the work piece. The consumable electrode can be fixed in a vibrating holder for repetitive arcing to build-up coating thickness. Depending on the area to be treated electrode must be moved in a fashion similar to the welding process. The unit consists of a transformer, capacitor bank and a mosfet to impart necessary voltage, spark energy and pulse frequency. A rotating tool electrode holder is an important accessory for applying the coating using metallic electrodes on larger surfaces and for mechanisation of the process. The process, which necessarily requires the substrate material to be conducting, is particularly well suited for localized area coatings, rebuilding the worn areas and can also be conveniently employed on components having complicated geometries.