Memoirs of the Faculty of Engineering, Yamaguchi University
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Memoirs of the Faculty of Engineering, Yamaguchi University Volume 30 Issue 2
published_at 1980
On the Constriction Effect of a Nozzle Arc
ノズルアークの集束効果について
Saeki Setsuo
Osaki Katashi
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Descriptions
The constriction effect of the arc in the cross electrcde type nozzle was investigated in nine kinds of nozzle, which were able to vary stepwise the nozzle diameter between 6mm and 30mm. Experiments were made at the arc current to be from 17A to 31A for DC arc and 40A to 100A for AC arc in Argon gas flow rate to be from 8 l/min to 20 l/min. The arc voltage-current characteristics for all nozzles was a drooping characteristics. With decreasing in the nozzle diameter below 14mm and increasing in the gas flow rate, the wall compression effect became efficient and the arc column was always held on the nozzle center axis. The relative spectral line intensity of the nozzle arc of the nozzle diameter to be 6mm was about two times of that of the nozzle diameter to be 14mm.
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