Power factor monitoring and control system for resistance...

B - Operations – Transporting – 23 – K

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327/105

B23K 9/10 (2006.01) G06F 15/46 (1980.01)

Patent

CA 1153430

ABSTRACT A power Factor Monitoring and Control System for controlling the quality of a spot weld made in the automotive industry on assembly line welders. The quality and strength of a spot weld can be correlated to a drop in resistance during the fusion process. Rather than measuring this resistive drop at the welding electrodes by attaching external sensing means thereto, the control system of the present invention makes use of the phenomenon that a resistive drop also causes a change in the total load power factor further resulting in a change to the current extinction angle of a weld half cycle. By determining the amount of increase or decrease that has occurred in the current extinction angle during a weld or a group of welds, a basis for the control of the welding heat is obtained.

371764

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