This is the first time i am starting to cut on 8 mm Mild Steel. I have peculiar problem. My torch pierces and when it starts to cut it goes up from intial cut height of 1.6 mm to 9 mm ,which is the upper limit i have set and then stops and the final arc volts reads 190 upwards. This is the first time i have encountered such a problem.
My Settings for 8 mm Mild Steel are
Arc voltage 139
Pierce rate 25 IPM
cutting speed 75 IPM