Electric Welding by Unknown

Author:Unknown
Language: eng
Format: epub
Tags: Material Science
Published: 1923-03-25T05:00:00+00:00

FIG. 269.—General Electric Co.'a Experimental Spot-Welding Machine Current Capacity 100,000 Amp. Pressure Capacity M Tons Jhu Welded Three Plates, Each 1 In. Thick.

and with a panel carrying the necessary selector switches and contactor The maximum voltage provided by this regulating transformer as al present constructed is 440. If it is found that the current obtained witl this voltage is not sufficient for the heaviest work which it is desired tc do with this machine, the maximum voltage may be changed to 500

«n h \ kVa ' 6ntering the transformers of 440 volts will be approximately 350 each, instead of 450.

SPOT-WELDING MACHINES AND WORK

319

In order that this machine may he operated from any ordinary power circuit, it will be necessary to use a motor-generator set provided with a suitable flywheel. This will eliminate the bad power-factor, distribute the load equally on the three phases, and over a much larger interval of time for each weld, thus substituting small gradual changes in power for large and sudden changes. On account of the high reactance the welding current will remain practically Constant as the speed of the motor-generator set falls away, thus favoring the utilization of the flywheel. The total maximum power drawn from the circuit with this arrangement would be about 100 kilowatts.

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