Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1997-08-13
2000-02-01
Kastler, Scott
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 1024, 75386, C21B 1110
Patent
active
060198117
ABSTRACT:
Apparatus and method for controlling metals processing (e.g., ESR) by melting a metal ingot and counting molten metal droplets during melting. An approximate amount of metal in each droplet is determined, and a melt rate is computed therefrom. Impedance of the melting circuit is monitored, such as by calculating by root mean square a voltage and current of the circuit and dividing the calculated current into the calculated voltage. Analysis of the impedance signal is performed to look for a trace characteristic of formation of a molten metal droplet, such as by examining skew rate, curvature, or a higher moment.
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EPRI(Electric Power Research Institute), "Electroslag Processing: State-of-the-Art Assessment," EPRI EM--4992 Project 2570-1, Center for Metals Production, Pittsburgh PA (Oct. 1987) pp S-1--9-1).
Ballantyne, A.S., et al., "The Influence of Melting Rate on Structure in VAR and ESR Ingots," reference source: Proc. 5.sup.th International Conf. Voc. Met. & ESR, pp 181-183 (No month, 1976).
Mitchell, A., "Process Limitations of ESR and VAR for high-Quality Allows", Prespectives in Metalurgical Development, Pul: The Metals Society, London, Sheffield, England Jul. 16-18, 1984 (pp 89-98).
Mitchell, A., "Theory and Practice of Electroslag Melting", Journ of Vacuum Sci and Tech, vol. 7, No. 8, pp 863-873 (Nov. -Dec. 1970).
Mitchell, A., "Factors Affecting Solidification and ingot Temperatures in ESR," 39.sup.th Electric Furnace Conf Proc, Electric Furnace Div, Iron and Steel Soc(AIMM & P Eng.), vol. 39 pp 569-598 (Apr. 23-27, 1979).
Melgaard David
Robertson Joanna M.
Schlienger Eric
Shelmidine Gregory J.
Van Den Avyle James A.
Kastler Scott
Libman George H.
McGuthry-Banks Tima
Sandia Corporation
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