Using a CNC profiling machine Powermax 1650
Hypertherm PHC Height controller
I am getting a lot of slag inside of the retaining cap of my Duramax torch.

Getting error code 02

Using 105 amp tip.
Cutting 12mm plate.
getting good cuts.
but getting about 15 pierces, some times 4 pierces then have to replace the cap.

Have tried adjusting the voltage from 145 to 156
Any one have any suggestions.

Staring to become costly
Regards,
Jim McFarlane