Original title: Observation of HF Cathode and ARC Root Inside Cutting Plasma Torch
Authors: Šonský, Jiří ; Gruber, Jan
Document type: Papers
Conference/Event: Symposium on Physics of Switching Arc /20./, Nové Město na Moravě (CZ), 2013-09-02 / 2013-09-06
Year: 2013
Language: eng
Abstract: Electric arc and a cathode of a cutting plasma torch was observed through fused silica window in a specially modified nozzle. Sample rate of used high-speed camera was up to 120 kHz, sufficient for detecting high-frequency fluctuations in arc plasma intensity, produced mainly by current ripple. Fluctuations were examined up to 60 kHz by Fast Fourier Transformation (FFT). Increased cathode material loss at start-up and shut-down phase of the plasma torch was observed. At start up phase, large number of small particles are ejected from the cathode. After electric current shuts down, large droplets of molten material are usually detected.
Keywords: FFT; fluctuations; plasma torch
Host item entry: XXth Symposium on Physics of Switching Arc, ISBN 978-80-214-4753-0

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0224930

Permalink: http://www.nusl.cz/ntk/nusl-156684


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Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers