Method of electrode current control in welding apparatus having

Details Method of electrode current control in welding apparatus having Method of electrode current control in welding apparatus having

1981-10-22

1983-08-02

Shaw, C. C.

Electric heating

Metal heating

By arc

21913051, B23K 909

Patent

active

043968236

ABSTRACT:
In a welding apparatus having a plurality of electrodes and adapted for carrying out welding operation on a workpiece by alternately supplying currents to the individual electrodes through switching elements, an apparatus and method of controlling the currents supplied to the electrodes, comprising selecting the values of the currents supplied to the individual electrodes depending on the material of the workpiece, and carrying out the welding operation on the workpiece by alternately supplying the currents of the selected values to the individual electrodes respectively through the switching elements. The method is featured by the fact that the ratio between the individual currents is selected under the condition that the sum of the values of all the currents is maintained at a predetermined value. It is also featured by the fact that, depending on the welding condition, the values of the individual currents can be freely selected without the limitation of maintaining the sum of all the currents at the predetermined value. Therefore, the apparatus and method are applicable to welding of a variety of materials by selecting the values of the individual currents depending on whether the workpiece has a high or low melting point and also whether the workpiece has a high or low heat conductivity.

REFERENCES:
patent: 3627974 (1971-12-01), Normando et al.

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