Relating Spectroscopic Measurements in a Plasma Cutting Torch to Cutting Performance |
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| Authors: | J Peters B Bartlett J Lindsay J Heberlein |
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| Institution: | (1) Hypertherm Inc., P.O. Box 5010, Hanover, NH 03755, USA;(2) Department of Mechanical Engineering, University of Minnesota, 111 Church St, Minneapolis, MN 55455, USA;(3) Turbo Solutions Engineering, LLC, 16 Beaver Meadow Rd, Norwich, VT 05055, USA |
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| Abstract: | The relationship between plasma properties and cutting performance for a plasma arc cutting system was investigated. Plasma
properties such as temperature and composition were measured using spectroscopic techniques in a 200 amp oxygen plasma cutting
system. In addition to the plasma properties, the symmetry of the cylindrical cutting arc was also quantified. Cutting performance
was measured by analyzing the edge quality of sample cuts. The most important measure of edge quality for this study was the
angle of the cut edge. Operating parameters investigated included the effect of shield gas flow and geometry changes caused
by cathode erosion. The measured plasma properties are used to account for the observed increase in recommended cutting speed
for different consumable designs which operated at the same current level. A strong correlation was also shown between the
measured arc symmetry and the cutting performance. |
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