a bit of a tip with picking plasma's is most makes have cut and severance ratings thease are at the limit and you need to be at 50-75% of thease to use at any speed and with any quality of cut.
also helps to have the right tip/nozzle for cut depth and thay dont last forever so replace them when needed.
if you have a inverter type keep it dry and out the way of metal dust it will last longer
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