I haven't heard it much being explained. I don't know your machine. It took me a while to find the answers. HF is an overrunning high frequency high voltage with low amperage. It does little to transfer heat. Its purpose is to ionize shielding gas creating an interstate highway for the low voltage, in some machines fixed at 60 cycles, high current arc that heats the metal workpiece so it in turn can melt filler. Cleaning points and altering gap will change the frequency of the HF, it won't change the frequency of the welding arc.