ESR Process Instabilities while Melting Pipe Electrodes

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Description

With the demonstration of the viability of using the electroslag remelting process for the decontamination of radionuclides, interest has increased in examining the unique aspects associated with melting steel pipe electrodes. These electrodes consist of several nested pipes, welded concentrically to atop plate. Since these electrodes can be half as dense as a solid electrode, they present unique challenges to the standard algorithms used in controlling the melting process. Naturally the electrode must be driven down at a dramatically increased speed. However, since the heat transfer is greatly influenced and enhanced with the increased area to volume ratio, considerable variation ... continued below

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13 p.

Creation Information

Melgaard, D.K. & Shelmidine, G.J. January 6, 1999.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

With the demonstration of the viability of using the electroslag remelting process for the decontamination of radionuclides, interest has increased in examining the unique aspects associated with melting steel pipe electrodes. These electrodes consist of several nested pipes, welded concentrically to atop plate. Since these electrodes can be half as dense as a solid electrode, they present unique challenges to the standard algorithms used in controlling the melting process. Naturally the electrode must be driven down at a dramatically increased speed. However, since the heat transfer is greatly influenced and enhanced with the increased area to volume ratio, considerable variation in the melting rate of the pipes has been found. Standard control methods can become unstable as a result of the variation at increased speeds, particularly at shallow immersion depths. The key to good control lies in the understanding of the melting process. Several experiments were conducted to observe the characteristics of the melting using two different control modes. By using a pressure transducer to monitor the pressure inside the pipes, the venting of the air trapped inside the electrode was observed. The measurements reveal that for a considerable amount of time. the pipes are not completely immersed in the slag, allowing the gas inside to escape without the formation of bubbles. This result has implications for the voltage swing as well as for the decontamination reactions.

Physical Description

13 p.

Notes

OSTI as DE00003246

Medium: P; Size: 13 pages

Source

  • AVS International Liquid Metal Processing and Casting Symposium, Santa Fe, NM (US), 02/21/1999--02/24/1999

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  • Report No.: SAND99-0025C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 3246
  • Archival Resource Key: ark:/67531/metadc676769

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • January 6, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 7, 2017, 1:06 p.m.

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Melgaard, D.K. & Shelmidine, G.J. ESR Process Instabilities while Melting Pipe Electrodes, article, January 6, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc676769/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.