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Investigation examined cathode erosion rates in high-pressure plasma arcs, indicating influences of materials and conditions.
Cathode erosion rate was experimentally investigated for two types of arcs: one with tungsten cathode in nitrogen atmosphere and one with hafnium cathode in oxygen atmosphere. Conditions were typical for plasma arc cutting systems: gas pressure from 2 to 5 atm, arc current from 200 to 400 A, gas flow rate from 50 to 130 litre min−1.
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Nemchinsky et al. (2003) studied this question.
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