Method for controlling welding current

Details Method for controlling welding current Method for controlling welding current

1982-12-28

1984-08-14

Shaw, C. C.

Electric heating

Metal heating

For bonding with pressure

219114, B23K 1124

Patent

active

044659180

ABSTRACT:
A method for controlling a welding current in a resistance welder which phase-controls an A.C. power supply voltage by a thyristor to control the welding current to a target value. Prior to supplying the welding current, a test current is supplied to measure a power-factor angle of a load. A plurality of curves representing relations between the welding currents and control voltages to a phase-shift pulse generator for a plurality of power-factor angles of the load are presets and one of the curves is selected in accordance with the selected power-factor angle of the load. A variation of the A.C. power supply voltage is measured. A period of a pulse generated by the phase-shift pulse generator is controlled based on a value determined in accordance with the selected curve and the measured variation of the A.C. power supply voltage to control a firing angle of the thyristor.

REFERENCES:
patent: 3694615 (1972-09-01), Brandeis
patent: 4104724 (1978-08-01), Dix et al.
patent: 4289948 (1981-09-01), Jurek et al.
patent: 4289951 (1981-09-01), Jurek

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