Electric heating – Metal heating – For bonding with pressure
Patent
1998-02-23
2000-07-11
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
B23K 1124
Patent
active
060876131
ABSTRACT:
A weld controller maintains an internal dynamic model of load impedance, which tracks normal impedance variations that occur as the weld tooling degrades. The weld controller contains a weld process monitor function that tests an estimated load impedance of a weld schedule presently under execution against an internal dynamic model and generates events when characteristics of the estimated load impedance of the present weld falls outside an operator definable band, indicating a problem with the workpiece presently being welded. The weld controller further includes the capability to accept a static model of the load impedance that is used as the reference impedance for the weld control and tooling. The weld controller also includes means to declare an event when characteristics of the dynamic model differ from the static model by an operator-defined amount. The weld controller allows a distinction to be made between a short-term difference in load impedance, generally indicative of a weld process variation and the long-term difference in load impedance, generally indicative of tooling degradation. This provides for tighter controls of weld process variations than could previously be achieved, coupled with an indication of incipient tooling faults.
REFERENCES:
patent: 4459457 (1984-07-01), Jurek
patent: 5386096 (1995-01-01), Buda et al.
patent: 5449877 (1995-09-01), Buda et al.
Bailey Jonathan H.
Buda Paul R.
Dew Larry A.
Slazinski Robert M.
Femal Michael J.
Golden Larry I.
Shaw Clifford C.
Square D Company
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