| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technology for correctly suppressing a variation in arc length caused by disturbance in the pulse arc welding of consumable electrode type. Ž<P>SOLUTION: A welding control apparatus includes: an integrator for starting calculation of a voltage error integral value Sv2, expressed by a formula (1) given below, from the point of time when a first pulse period ends and a second pulse period starts in a pulse cycle, based on various data of information regarding a gradient Ks of an external characteristic of a welding power supply and a welding current setting value Is2 and a welding voltage setting value Vs2 both in a second pulse period, which are preset as parameters in the formula (1), as well as on an instantaneous value Io2 of a welding current and an instantaneous value Vo2 of a welding voltage both detected in the second pulse period; 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, per pulse cycle, terminating the relevant pulse cycle and starting a next pulse cycle at the point of time when the value of the voltage error integral value Sv2 has become 0. Sv2=∫äKs(Io2-Is2)+Vs2-Vo2}dt (1). Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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