Electric arc welding processes and apparatus therefor

Details Electric arc welding processes and apparatus therefor Electric arc welding processes and apparatus therefor

1976-02-25

1978-05-30

Truhe, J. V.

Electric heating

Metal heating

By arc

21913021, B23K 910

Patent

active

040925170

ABSTRACT:
There is provided a method and apparatus for electric-arc welding, in which an alternating current of positive and negative pulses is supplied to produce an electric arc between a welding electrode and a workpiece. The ratio of the durations of the positive and negative pulses of welding current is arranged to be changed in response to a signal from a sensing device adapted to sense a change in a characteristic of the electric arc so as to provide optimum welding current for changed welding conditions. The ratio of the amplitudes of the positive and negative pulses may also be varied in response to a signal from a sensing means.

REFERENCES:
patent: 3068352 (1962-12-01), Correy
patent: 3296413 (1967-01-01), Steinert
patent: 3300683 (1967-01-01), Weishaar
patent: 3330933 (1967-07-01), Maklary
patent: 3382345 (1968-05-01), Normando
patent: 3496327 (1970-02-01), Vilkas
patent: 3598954 (1971-08-01), Iceland et al.
patent: 3679865 (1972-07-01), Jesnitzer et al.
patent: 3894210 (1975-07-01), Smith et al.

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