Arc welding power source with response delay compensating contro

Details Arc welding power source with response delay compensating contro Arc welding power source with response delay compensating contro

1985-09-26

1987-05-12

Shaw, Clifford C.

Electric heating

Metal heating

By arc

21913032, 219137PS, B23K 910

Patent

active

046652990

ABSTRACT:
An arc welding power source utilizing welding current from a two-step voltage conversion comprising a first target value setting circuit means for setting a first current target value V.sub.1 corresponding to a desired value of welding current, a current control circuit for controlling the welding current in accordance with the first current target value V.sub.1, a second target value setting circuit means for setting a second current target value V.sub.2 higher than the first current target value for satisfying a predetermined current waveform in response to an abrupt load variation, and a rapid operation current control circuit for controlling the welding current in accordance with the second current target value V.sub.2. Thus, even if the welding load tends to abruptly vary and the welding current tends to largely exceed the first current target value V.sub.1, the welding current is clipped by the second current target value V.sub.2 by the rapid operation current control circuit having a rapid response so as to maintain the actual welding current in the allowable V.sub.1 -V.sub.2 range.

REFERENCES:
patent: 3792225 (1974-02-01), Needham et al.
patent: 4469933 (1984-09-01), Mizuno et al.
patent: 4476376 (1984-10-01), Mizuno et al.
patent: 4544826 (1985-10-01), Nakanishi et al.
patent: 4560857 (1985-12-01), Segawa et al.

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