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Dynamic control of remelting processes

United States Patent

September 5, 2000
View the Complete Patent at the US Patent & Trademark Office
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An apparatus and method of controlling a remelting process by providing measured process variable values to a process controller; estimating process variable values using a process model of a remelting process; and outputting estimated process variable values from the process controller. Feedback and feedforward control devices receive the estimated process variable values and adjust inputs to the remelting process. Electrode weight, electrode mass, electrode gap, process current, process voltage, electrode position, electrode temperature, electrode thermal boundary layer thickness, electrode velocity, electrode acceleration, slag temperature, melting efficiency, cooling water temperature, cooling water flow rate, crucible temperature profile, slag skin temperature, and/or drip short events are employed, as are parameters representing physical constraints of electroslag remelting or vacuum arc remelting, as applicable.
Bertram; Lee A. (Dublin, CA), Williamson; Rodney L. (Albuquerque, NM), Melgaard; David K. (Albuquerque, NM), Beaman; Joseph J. (Austin, TX), Evans; David G. (Clinton, NY)
Sandia Corporation (Albuquerque, NM)
09/ 244,372
February 3, 1999
GOVERNMENT RIGHTS The Government has rights to this invention pursuant to Contract No. DE-AC04-94AL85000 awarded by the U.S. Department of Energy.