Annealing apparatus
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United States of America Patent
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-
Mar 9, 2004
Grant Date -
Oct 30, 2003
app pub date -
Apr 30, 2002
filing date -
Apr 30, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus is disclosed for annealing only a portion of an elongated tubular workpiece. The apparatus includes an elongated tube dimensioned to receive the workpiece so that a first end of the workpiece together with the portion to be annealed is positioned within the tube while a second end of the workpiece extends outwardly from the tube. An induction coil is disposed coaxially around only a portion of the workpiece portion exteriorly of the tube while a source of pressurized nitrogen/hydrogen is fluidly connected to the interior of the tube. In an annealing operation, the tube is filled with hydrogen/nitrogen and the induction coil is energized thus heating only the portion of the workpiece for which annealing is desired. Simultaneously, hydrogen/nitrogen flows through the tube thus cooling the workpiece and maintaining an oxygen-free environment within the tube.
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