Using non-oxidizing gas for plasma arc starting process

Details Using non-oxidizing gas for plasma arc starting process Using non-oxidizing gas for plasma arc starting process

B - Operations, Transporting

23

K

327/66

B23K 9/067 (2006.01) B23K 35/38 (2006.01) H05H 1/34 (2006.01)

Patent

CA 2023991

A process for starting a plasma arc torch is disclosed which minimizes the oxidation of the electrode to thereby extend the life of the electrode. A flow of non-oxidizing gas is first generated between the discharge end of the torch electrode and the nozzle assembly of the torch. A pilot arc then is created between the discharge end of the electrode and the nozzle assembly. The pilot arc is transferred and the flow of non-oxidizing gas is terminated. A flow of oxidizing gas then is generated for plasma formation.

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