Direct current resistance welding machine and method of controll

Details Direct current resistance welding machine and method of controll Direct current resistance welding machine and method of controll

1993-06-14

1994-11-01

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219116, B23K 1124

Patent

active

053609590

ABSTRACT:
A direct current resistance welding machine and a method of controlling the direct current resistance welding machine wherein primary current of a welding transformer is detected when a plurality of switching devices of an inverter are controlled based on corresponding pulses having a predetermined frequency and each having a time width corresponding to the value of a required secondary current. Rise and fall times of the detected primary current are detected. An upper limit frequency Of the primary current is computed based on the time width of each pulse and on the rise and fall times. Thus, the primary current of the welding transformer is controlled by controlling the switching devices based on pulses having a frequency falling within the computed upper limit frequency.

REFERENCES:
patent: 4973815 (1990-11-01), Ito et al.
patent: 5196668 (1993-03-01), Kobayashi et al.

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