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

1979-02-16

1981-09-15

Shaw, C. C.

Electric heating

Metal heating

For bonding with pressure

219114, 2191171, 323211, B23K 1124

Patent

active

042899516

ABSTRACT:
A power factor monitoring and control system with line disturbance immunity for controlling the quality of spot welds made by resistance welding techniques such as those used in the automotive industry on assembly line welders. As is commonly known, quality and strength of a spot weld can be correlated to a change in resistance measured through the weld as the weld progresses during the fusion progress. This change in resistance in the secondary circuit reflects back through the transformer to its primary circuit as a change in power factor. The timing changes resulting from the change in power factor are sensed by the control circuitry of this system to generate signals which are used by an 8-bit microprocessor properly programmed to operate on the signal information. By determining the amount of increase or decrease that has occurred in the current conduction angle during a group of welds, a basis for the control of the welding heat is obtained. By averaging the results of these measurements over a sufficiently large number of welds, the effect of random line disturbances is cancelled out.

REFERENCES:
patent: 3010064 (1961-11-01), Ross
patent: 3694615 (1972-09-01), Brandeis
patent: 3832518 (1974-08-01), O'Neal, Jr.
patent: 4104724 (1978-08-01), Dix et al.

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