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  • 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.
  • 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. (en)
Title
  • Observation of HF Cathode and ARC Root Inside Cutting Plasma Torch
  • Observation of HF Cathode and ARC Root Inside Cutting Plasma Torch (en)
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  • Observation of HF Cathode and ARC Root Inside Cutting Plasma Torch
  • Observation of HF Cathode and ARC Root Inside Cutting Plasma Torch (en)
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  • RIV/61388998:_____/13:00395504!RIV14-AV0-61388998
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  • 93002
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  • RIV/61388998:_____/13:00395504
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  • plasma torch; fluctuations; FFT (en)
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  • [280C01B6095B]
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  • Nové Město na Moravě
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  • Brno
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  • XXth Symposium on Physics of Switching Arc
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  • Gruber, Jan
  • Šonský, Jiří
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number of pages
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  • Brno university of Technology
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  • 978-80-214-4753-0
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