Patent ID: 6011235
Filing Date: 2000-01-04
Classification: B23K

Abstract:
A method for use in controlling a resistance welding operation in which workpieces are kept in pressure contact with first and second welding electrodes at spaced contact positions and a welding current flows through the workpieces via the first and second welding electrodes to thereby weld the workpieces at first and second points corresponding to the contact positions of the first and second welding electrodes, respectively, said method comprising:dividing a weld time of the resistance welding operation into first and second weld periods;controlling the welding current to flow in a first polarity in the first weld period;controlling the welding current to flow in a second polarity in the second weld period; andcontrolling the magnitude of the welding current during the second weld period such that the magnitude of the welding current in the second weld period is greater than the magnitude of the welding current in the first weld period, or controlling the second weld period such that the second weld period is longer than the first weld period, so that nuggets at the first and second points grow to essentially the same size at the end of the second weld period.