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Engineering the bore shape to improve performance of a plasma torch

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1 Author(s)
A. R. Dayal ; Manuf. & Infrastructure Technol. Div., Commonwealth Sci. & Ind. Res. Organ., Woodville, SA, Australia

Design changes were made to a conventional plasma torch to improve its performance. The existing cylindrical bore of the torch was replaced with a convergent divergent shape. Experiments were conducted which showed significant reduction in torch segments temperature. As a result, the efficiency of the torch increased by 4% and the argon consumption was reduced by 33%. An increase in enthalpy of the plasma mainly due to the reduced argon flow rate would also increase the processing capacity of the torch. The theoretical estimates made using a torch model showed considerable change in the heat load distribution on the torch segments, which agreed well with the experiments.

Published in:

IEEE Transactions on Plasma Science  (Volume:30 ,  Issue: 5 )