On virtually every mig, the "wire feed" and amps adjustment is one and the same. Turning up the speed increases heat.

So, on machines with adjustable voltages (i.e. Miller 252), what is the effect of increasing voltage only.

Let's say the setting for 3/16 steel is 18.4 volts/265 FPM. What happens if the volts are increased to, say, 18.8?