(i think) the rshared_pm will mostly regulate the voltage and the amount of power to the rotor will give you the amperage
i know a 6 hp engine is not enough to make 160 amps @ 60 volts
6 hp =4474 watts perfect world
160amps @ 60 volts = 9600watts
not even close to max output of 160
but i weld often and 1/8 1/4 is what i weld most and i use about 75 to 80 amps or so
with 1/8 rods 6011 dc
will my 6 hp work shure you will regulate the total output by your welding style
i think that the alt welder power runs a little hotter due to the high frequency
the arc is related to the voltage the spark or heat is the amperage a good mix is what is needed to weld