Control apparatus for resistance welding machine

摘要

A control apparatus for a resistance welding machine comprises a welding current detecting device (5;205) for detecting a welding current, interelectrode voltage detecting device (6;206) for detecting an interelectrode voltage, a calculating section (13;213) for predicting a nugget growth and control section (16,17,18;212,215) for controlling the welding current so that the nugget growth can be adjusted to a predetermined value.