ELECTRODE VICINITY VOLTAGE FALLS IN SAW

The heat distribution between electrode and plate in SAW is determined by arc column voltage falls in the vicinities of the electrode and the plate. The knowledge of this distribution is crucial to control both penetration depth and deposition rate. The present paper introduces the obtained values of both anode and cathode voltage drops for the Lincolnweld 760M, 880M, 980 and Lincoln ES200 fluxes. The voltage drops have been determined based on the assumption that these values, as well as the electrode extension and contact tip resistances, remains constant for the concrete flux and electrode set. In this case wire feed speed and, consequently, the amount of heat affecting the electrode depend on the amperage by the parabolic law with coefficients proportional to the resistance and the voltage drop in the electrode vicinity. The calculations were made based on the mass and energy balance of experimental trials.