Mig Welding - Amps & Volts?

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I know it's a pretty basic question, but I've always assumed the "heat" knob controlled amps and the wire speed was volts, and there was only a certain amp to volt ratio you could weld in. I've been playing around with the HTP 2400, which has a digital display for volts and amps, had the "heat" maxed out and the wire feed at roughly 35% (way too low) and I noticed the amps display was only 150ish and 30 volts. As I increased the wire feed (while still welding), the amps slowly rose up to about 200 with the wire feed at about 70%. I measured the machine at about 775 IPM at 100% NOT WELDING. So how do volts and amps relate in terms of the weld? And when I look at the miller MIG calculator, it tells me recommended IPM and amps. But it now seems as though amps are controlled by the wire feed? If anyone knows of a link with some good reading on this, that would be awesome!John 3:16(2) Miller Pheonix 456(2) Millermertic 252Dynasty 210DXHobart 210MVPDoringer D350 SA Cold SawScotchman 350LT Cold SawWebb 10x50 MillWebb 15x40 LatheGeka Bendicrop Ironworker
Reply:Dont look at miller's calculator, because it not realy usable. Mig/mags are Constant Voltage (CV) machines, which means that you set VOLTAGE. Then the more wire speed you set the more amps will you get. Also you get more amps with thicker wire.