Control of electrode depth in electroslag remelting

Patent · Tue Jan 01 00:00:00 EST 2002

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 National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
• 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

control
electrode
depth
electroslag
remelting
method
apparatus
controlling
furnace
driving
nominal
speed
based
melting
rate
geometry
minor
proportional
adjustments
measured
metric
immersion
drive
increased
differs
set
predetermined
amount
indicating
tip
close
surface
slag
pool
impedance
spikes
monitored
adjust
properties
predetermined amount
melting furnace
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