B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
B23K 10/00 (2006.01) H05H 1/34 (2006.01) H05H 1/36 (2006.01)
Patent
CA 2330069
A process and apparatus for stopping a cutting operation of a plasma arc torch is disclosed which minimizes the oxidation of the electrode to thereby extend life of the electrode. A flow of oxidizing gas is directed through a plasma chamber and nozzle. An electrical current is then conducted through the electrode to form a plasma arc. The electrical current is cut no later than a time F for extinguishing the plasma arc. The flow of oxidizing gas is switched off a determinable time interval before time F, and a flow of non-oxidizing gas is switched on no later than time F, whereby the non-oxidizing gas substantially completely purges the oxidizing gas from the torch creating an inert environment, whereby the plasma arc extinguishes in the inert environment.
Sim & Mcburney
The Esab Group Inc.
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