Output control method for consumable electrode arc welding power source

摘要

In the output control method for a consumable electrode arc welding power source, entire application range of an welding current is segmentalized into a plurality of current zones, a norm welding voltage value is set for each of the current zones, a welding current and a welding voltage are detected at each of minute cycles, the current zone which corresponds to a detected value of the welding current is selected, a fluctuation range is calculated with the norm welding voltage value of the selected current zone as a center value, a welding voltage limit value is calculated while the welding voltage detected value is limited to within the fluctuation range, and the output of the welding power source is controlled based on this welding voltage limit value.

主权项

1. An output control method for a consumable electrode arc welding power source in which an output of the welding power source is controlled based on an amplified error value between a predetermined voltage setting value and a welding voltage, the method comprising:
segmentalizing a continuously changing portion, in an arc period, of a welding current into a plurality of current zones of equal current width including a first current zone and a second current zone, and the welding current changes continuously over the entire arc period, setting a norm welding voltage value for each of the current zones, detecting a welding current and a welding voltage at each of minute cycles, selecting one of the current zones which corresponds to a value of the detected welding current, calculating a fluctuation range with the norm welding voltage value of the selected current zone as a center value, calculating a welding voltage limit value while the detected value of the welding voltage is limited to within the fluctuation range, calculating the amplified error value using the voltage setting value and the welding voltage limit value and generating an error amplification signal, and directing the error amplification signal to the welding power source to control the output, wherein the fluctuation range within each of the first current zone and the second current zone is constant, and the fluctuation range in the first current zone differs from the fluctuation range in the second current zone.