Power factor monitoring and control system for resistance weldin

Details Power factor monitoring and control system for resistance weldin Power factor monitoring and control system for resistance weldin

1981-01-08

1983-08-16

Ruggiero, Joseph F.

Boots, shoes, and leggings

219110, 364482, 364483, G06F 1546, B23K 910

Patent

active

043995110

ABSTRACT:
A power factor monitoring and control system for controlling the quality of a spot weld made by assembly line welders. The control system of the present invention detects a change in the load power factor as the weld is formed which is manifested as a change in the current extinction angle of the half cycles of weld current. The time interval between the instant weld current is extinguished at the end of a programmed half cycle and an instant when current is extinguished at the end of a subsequent half cycle provides a measure of the resistance across the weld nugget. The time interval information is stored and compared with information provided during a previous half cycle to generate a difference signal. The change in resistance in the secondary circuit is reflected through the transformer to the transformer primary circuit as a decrease in power factor. The timing changes resulting from the decrease in power factor are sensed by the control circuitry to generate signals which operate to selectively vary the weld heat setting of the welder control or terminate the weld current.

REFERENCES:
patent: 3654424 (1972-04-01), Vanderhelst
patent: 3694615 (1972-09-01), Brandeis
patent: 3832518 (1974-08-01), O'Neal, Jr.
patent: 4076974 (1978-02-01), Gee
patent: 4104724 (1978-08-01), Dix et al.
patent: 4230929 (1980-10-01), Blair et al.

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