Feedback welder control system

Details Feedback welder control system Feedback welder control system

1982-09-30

1984-07-10

Shaw, C. C.

Electric heating

Metal heating

For bonding with pressure

219114, B23K 1124

Patent

active

044594569

ABSTRACT:
A control system for resistance welders of the type in which welding current is supplied to a workpiece through a transformer. The system assures weld quality by monitoring the change in resistance across the weld during the welding operation without the need for auxillary leads or separate sensing transducers at or near the workpiece and automatically terminates the welding current when a quality weld is made as determined by resistivity characteristics of the weld. The system monitors discrete changes in the characteristics of the current in the primary of the welding transformer which occur as a result of changes in weld resistance. The system compares the monitored current characteristics of the welding current with a plurality of parameters indicative of a quality weld and terminates the welding current when a selected number of monitored characteristics are within selected parameters.

REFERENCES:
patent: 4254466 (1981-03-01), Jurek
patent: 4302653 (1981-11-01), Denning et al.

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