METHOD FOR CORRECTING WEAVING AMPLITUDE OF WELDING TORCH IN WEAVING WELDING

摘要

PURPOSE:To make an actual amplitude value always equal to a command value by calculating the actual amplitude value from the max. value and min. value of the amplitude of the signal indicating the position of a torch with time and correcting the command value in accordance with the correction factor determined from the actual amplitude value and the amplitude command value. CONSTITUTION:A command signal X1(t) indicating the position of a torch with time is formed in accordance with the respective commands for weaving frequency F, amplitude A and offset S generated from a signal generating circuit 11 and a driving motor 17 is controlled to imput the signal X2(t) indicating the actual position of the torch with time from a counter 20 to an arithmetic circuit 21. The actual amplitude value (a) of the torch is then calculated from the max. value and min. value of the amplitude of the signal X2(t) and a correction factor K(=A/a) is calculated from the value (a) and a preset amplitude command value A, by which the corrected amplitude command value A<2>/a is obtd. The command signal is corrected by said value. The dependency of the actual amplitude value of the torch on the frequency and the variance in the characteristic by each torch are thus eliminated.