Electric heating – Metal heating – For bonding with pressure
Patent
1980-04-02
1981-11-24
Rubinson, Gene Z.
Electric heating
Metal heating
For bonding with pressure
219111, 2191171, B23K 1124
Patent
active
043026532
ABSTRACT:
A resistance welding controller for dynamically controlling both weld current and weld time in order to achieve a desired .DELTA.R value. The resistance across the weld electrodes is monitored by the controller during the heat-up phase of the weld and compared to target values for minimum resistance (Rmin) and rate of resistance change (dR/dt). If the observed values for Rmim and dR/dt bear a predetermined relationship to the target values, a dynamic correction is made in the percentage heat control setting. The weld is then continued at the revised weld current level until the desired .DELTA.R value is satisfied. If upon weld termination, the observed weld time is greater than the target weld time, an additional correction in weld current is made in preparation for the next weld. In addition, the controller is also adapted to detect newly dressed weld electrodes and automatically respond by reverting to the original weld schedule.
REFERENCES:
patent: 3518399 (1970-06-01), Vanderhelst
patent: 3546421 (1970-12-01), Meyer et al.
patent: 3573421 (1971-04-01), Vanderhelst
patent: 3588438 (1971-06-01), Vanderhelst
patent: 3746892 (1973-07-01), Petzold
patent: 4024371 (1977-05-01), Drake
Beltz William L.
Denning Erwin E.
George Keith E.
Rubinson Gene Z.
Weltronic Company
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