floor pans

Wire speed has alot to do with it. If it is too fast it will feel like it is pushing the gun away from the metal as you weld. If it is too slow the wire will burn before it hits the metal and sometimes stick in the welding tip. Not sure on what number it should be on I never look at mine just turn till its right. Mine has 4 heat settings if I weld sheet metal with tacks it works on 2 or B I perfer 3 or C because it puddles better but if not fast in 1 spot too long it blows a hole in that setting.