SYSTEM AND METHOD FOR CONTROLLING ELECTRIC ARC WELDER

摘要

PURPOSE: A system and method for controlling an electric arc welder is provided to prevent the reduction of the homogeneity of a weld bead by a welding process intermittently stopping by the rapid variation of protruded and arc lengths caused by a slow control in welding aluminum. CONSTITUTION: A control system for an electric arc welder(A) performing a welding process between an electrode(34) and a workpiece(36) is composed of a high speed switching type power supply(10) having a controller worked at a switching frequency of at least about 10 kHz with an input current control signal adjusting an output current of the power supply; a first senor detecting the actual arc voltage; a second sensor sensing an actual arc current(la); a first circuit generating a power signal representing the desired real time power level at progressive times during the welding process; a second circuit(22) creating the function of the sensed actual voltage and the sensed actual current; and a third circuit adjusting the current control signal in accordance with the difference between the power signal and the function of the actual voltage and current, preferably arc power.