Plasma arc torch and method of operation

Details Plasma arc torch and method of operation Plasma arc torch and method of operation

B - Operations, Transporting

23

K

B23K 9/10 (2006.01) B23K 9/06 (2006.01) B23K 9/16 (2006.01) H05H 1/36 (2006.01)

Patent

CA 2440113

There are provided a plasma arc torch and associated methods for selectively switching between a working mode and a standby mode. An electric arc is established between an electrode and a workpiece, and the torch is operated selectively in the working and standby modes. In the working mode, the arc extends between the electrode and the workpiece, the arc has a working arc current, and a plasma gas flows through a nozzle at a working flow rate. In the subsequent standby mode, the arc extends between the electrode arid the nozzle and has a current less than the working arc current. The gas flow rate in the standby mode can be reduced to less than the working flow rate, and the plasma gas can be switched from an oxidizing gas to a non-oxidizing gas.

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