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  1. ( , Proceedings of the Liquid Metals Processing & Casting Conference)
    The behavior of vacuum arcs during VAR processing is known to impact product yield and contribute to ingot defects. Ampere Scientific’s VARmetricTM system has demonstrated non-invasive detection of the spatio-temporal properties of vacuum arcs, including the detection of side-arcing conditions, by utilizing measurements of the magnetic field external to the furnace. Here we present an analysis of spatio-temporal arc distributions measured by VARmetricTM on a production VAR furnace. Analysis of the arc over different timescales provides new insights into the operating characteristics of VAR furnaces, and on how power is transferred to the molten pool. For example, even under similar steady state operating conditions within a given melt, we have identified significantly different arc distributions, information that may be useful in further understanding the characteristics of the molten metal pool. 
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    Accepted Manuscript Full Text Available
  2. ( , Proceedings of the Liquid Metals Processing & Casting Conference)
    The behavior of vacuum arcs during VAR processing is known to impact product yield and contribute to ingot defects. Ampere Scientific’s VARmetricTM system has demonstrated non-invasive detection of the spatio-temporal properties of vacuum arcs, including the detection of side-arcing conditions, by utilizing measurements of the magnetic field external to the furnace. Here we present an analysis of spatio-temporal arc distributions measured by VARmetricTM on a production VAR furnace. Analysis of the arc over different timescales provides new insights into the operating characteristics of VAR furnaces, and on how power is transferred to the molten pool. For example, even under similar steady state operating conditions within a given melt, we have identified significantly different arc distributions, information that may be useful in further understanding the characteristics of the molten metal pool. 
    more » « less
    Accepted Manuscript Full Text Available