An improved electronic control for capacitor-discharge resistance welding

THE capacitor-discharge system of resistance welding has been used widely in the past four years because: 1. The current required to produce welds in material of a given thickness can be obtained with lower kilovolt-ampere demand on the power supply than is required by a corresponding single-phase a-c resistance welder. 2. It provides a three-phase balanced load on the powerj-supply system as compared with the single-phase load of a-c resistance welders. 3. It provides precise control of the magnitude of the welding current on successive welds in spite of varying line voltages. This is vitally necessary in the welding of aluminum.