Electric heating – Metal heating – For bonding with pressure
Patent
1982-09-30
1984-07-10
Shaw, C. C.
Electric heating
Metal heating
For bonding with pressure
219114, B23K 1124
Patent
active
044594577
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 weld resistivity characteristics. The system monitors discrete changes in the characteristics of the current in the welding transformer which occur as a result of changes in weld resistance. Immunity to line voltage disturbances which cause charges in current characteristics unrelated to resistance change in the weld is achieved by the use of a modeling circuit which is subjected to the same line voltage disturbances as the actual welder circuit and which simulates the current characteristics of the actual welder but is unresponsive to the resistive changes which occur across the weld during the welding operation. The system compares the current characteristics of the modeling circuit with those of the actual welding current and terminates the welding current in response to the true resistance change which occurs during welding formation.
REFERENCES:
patent: 3588438 (1971-06-01), Vanderheist
patent: 4104724 (1978-08-01), Dix et al.
patent: 4271387 (1981-06-01), Mukai et al.
patent: 4289948 (1981-09-01), Jurek et al.
patent: 4302653 (1981-11-01), Denning et al.
Guttman Richard T.
Schmeling William H.
Shaw C. C.
Square D Company
LandOfFree
Feedback welder control system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Feedback welder control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Feedback welder control system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1577601