Optimal Estimation of Electrode Gap During Vacuum ARC Remelting

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Description

Electrode gap is a very important parameter for the safe and successful control of vacuum arc remelting (VAR), a process used extensively throughout the specialty metals industry for the production of nickel base alloys and aerospace titanium alloys. Optimal estimation theory has been applied to the problem of estimating electrode gap and a filter has been developed based on a model of the gap dynamics. Taking into account the uncertainty in the process inputs and noise in the measured process variables, the filter provides corrected estimates of electrode gap that have error variances two-to-three orders of magnitude less than estimates ... continued below

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44 p.

Creation Information

WILLIAMSON,RODNEY L.; BEAMAN,J.J.; HYSINGER,C.L. & MELGAARD,DAVID K. June 14, 2000.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 23 times . More information about this article can be viewed below.

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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

Electrode gap is a very important parameter for the safe and successful control of vacuum arc remelting (VAR), a process used extensively throughout the specialty metals industry for the production of nickel base alloys and aerospace titanium alloys. Optimal estimation theory has been applied to the problem of estimating electrode gap and a filter has been developed based on a model of the gap dynamics. Taking into account the uncertainty in the process inputs and noise in the measured process variables, the filter provides corrected estimates of electrode gap that have error variances two-to-three orders of magnitude less than estimates based solely on measurements for the sample times of interest. This is demonstrated through simulations and confined by tests on the VAR furnace at Sandia National Laboratories. Furthermore, the estimates are inherently stable against common process disturbances that affect electrode gap measurement and melting rate. This is not only important for preventing (or minimizing) the formation of solidification defects during VAR of nickel base alloys, but of importance for high current processing of titanium alloys where loss of gap control can lead to a catastrophic, explosive failure of the process.

Physical Description

44 p.

Notes

OSTI as DE00759874

Medium: P; Size: 44 pages

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  • Journal Name: Metallurgical and Materials Transactions B; Other Information: Submitted to Metallurgical and Materials Transactions B

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  • Report No.: SAND2000-1512J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 759874
  • Archival Resource Key: ark:/67531/metadc702405

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  • June 14, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 12, 2017, 4:41 p.m.

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WILLIAMSON,RODNEY L.; BEAMAN,J.J.; HYSINGER,C.L. & MELGAARD,DAVID K. Optimal Estimation of Electrode Gap During Vacuum ARC Remelting, article, June 14, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc702405/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.