Electric heating – Metal heating – By arc
Patent
1981-11-03
1984-03-20
Shaw, C. C.
Electric heating
Metal heating
By arc
B23K 910
Patent
active
044383185
ABSTRACT:
A method and device for automatically controlling welding conditions for use in an arc welding machine, wherein an ignition or turn-on phase of a thyristor is controlled by an output of a first potentiometer to which a fixed voltage is applied. A voltage difference between the movable terminals of the first and a second potentiometer which are coupled in parallel, is detected by a differential amplifier which outputs a signal corresponding to the difference to a motor. The motor turns the movable terminals of the second and a third potentiometer which are operated synchronously, so that the detected difference may be zero. The output of the third potentiometer to which a fixed reference voltage is applied, is stored in a memory in a recording mode. Then, in a welding mode, the outputs of the third potentiometer and the memory are fed to the differential amplifier which controls the motor in the same manner as above, while the first potentiometer is replaced by the second potentiometer, thereby controlling welding conditions such as a welding voltage and a welding current.
REFERENCES:
patent: 3581051 (1971-05-01), Brown
patent: 3689734 (1972-09-01), Burley et al.
patent: 3715560 (1973-02-01), Emmerson
Okamura Corporation
Shaw C. C.
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