Inverter type DC resistance welding machine

Details Inverter type DC resistance welding machine Inverter type DC resistance welding machine

1987-06-22

1988-03-29

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

2191171, B23K 1124

Patent

active

047345560

ABSTRACT:
Disclosed is an inverter type DC welding machine incorporating constant-power control to assure a high and reliable quality of weld. The pulse width of the high-frequency output of the inverter circuit is controlled at the inverter switching rate by the constant-power control on a feedback loop basis in which the value of a weld power actually supplied to the portion to be welded between electrodes is computed and the computed value is compared with the value of a reference weld power to produce an error signal for controlling the operation of the inverter circuit, so that the actual weld power is maintained constant regardless of variations in the resistance of the portion to be welded during a welding operation.

REFERENCES:
patent: 3194939 (1965-07-01), Hill
patent: 3445768 (1969-05-01), Ferguson
patent: 3636298 (1972-01-01), Risberg et al.
patent: 3895212 (1975-07-01), Maxwell et al.

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