TORCH HEIGHT SENSING APPARATUS

Torch Height Sensing Apparatus A torch height sensing apparatus is provided for generating information representative of the spacing between a cutting torch and an associated workpiece. The apparatus drives a preselected current from the torch through the torch flame to the workpiece so that electro...

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Bibliographic Details
Main Author RICHARDSON, RICHARD W
Format Patent
LanguageEnglish
French
Published 13.11.1984
Edition3
Subjects
CLADDING OR PLATING BY SOLDERING OR WELDING
CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
SOLDERING OR UNSOLDERING
TRANSPORTING
WELDING
WORKING BY LASER BEAM
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Summary:Torch Height Sensing Apparatus A torch height sensing apparatus is provided for generating information representative of the spacing between a cutting torch and an associated workpiece. The apparatus drives a preselected current from the torch through the torch flame to the workpiece so that electrons flow from the workpiece through the flame to the torch. The output current biases the flame into the linear region of the preselected voltage-current characteristic at a positive torch to workpiece current. Biasing the torch for positive current flow from the torch to the workpiece insures that flame height sensing occurs in the positive linear region where the sensitivity is greatest due to the availability of thermally emitted electrons at the workpiece.
Bibliography:Application Number: CA19840445580