PTA Torch - Arc stabilization

Electrode - Thermal stabilization cycle

The thermal stabilization cycle of the tungsten electrode and anodic nozzle is performed automatically by the implemented program for the Pilot Arc Ignition and Shutting-off.

It consits in the normal arc ignition (I = 50 A), followed by an increase in the supplied current (I = 80-90 A) for T = 16-20 s, and then slopping down to the hold current value (I = 50 A).




A new brand torch, before entering the market, is subjected at Plasma Team factory to repeated ignitions of pilot arc, in accordance with the following data: Nr. 100 ignition-shutting down cycles with electrode set-back = 4 mm; Nr. 100 ignition-shutting down cycles with electrode set-back = 6 mm; Nr. 100 ignition-shutting down cycles with electrode set-back = 8 mm. The results of these test are shown in the following Fig. 1.




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