Welding control apparatus for pulse arc welding of consumed electrode type, arc length control method for use with the same, and welding system including the welding control apparatus

摘要

A welding control apparatus includes an integrator for starting calculation of a voltage error integral value Sv2 when a first pulse period ends and a second pulse period starts in a pulse cycle, based on various data. The apparatus also includes a comparator for comparatively determining whether a value of the voltage error integral value Sv2 provided as the calculation result has become 0, and a waveform generator for terminating the relevant pulse cycle and starting a next pulse cycle when the value of the voltage error integral value Sv2 is 0. Where Sv2=∫{Ks(Io2−Is2)+Vs2−Vo2}dt  (1).