Control of electrode depth in electroslag remelting

Patent · Mon Dec 31 23:00:00 EST 2001

OSTI ID:874950

Melgaard, David K ^[1]; Shelmidine, Gregory J ^[2]; Damkroger, Brian K ^[1]

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1. Albuquerque, NM
2. Tijeras, NM

A method of and apparatus for controlling an electroslag remelting furnace by driving the electrode at a nominal speed based upon melting rate and geometry while making minor proportional adjustments based on a measured metric of the electrode immersion depth. Electrode drive speed is increased if a measured metric of electrode immersion depth differs from a set point by a predetermined amount, indicating that the tip is too close to the surface of a slag pool. Impedance spikes are monitored to adjust the set point for the metric of electrode immersion depth based upon one or more properties of the impedance spikes.

• Research Organization: SANDIA CORP
• DOE Contract Number: AC04-94AL85000
• Assignee: Sandia Corporation (Albuquerque, NM)
• Patent Number(s): US 6496530
• OSTI ID: 874950
• Country of Publication: United States
• Language: English

Related Subjects

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nominal
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