TBYODA wrote:Pardon my ignorance but how does less current make the filler hotter? Sound backward. Just trying to understand.bartonmd wrote: But yes, if you are on the hairy edge, lowering the wire speed actually lowers the current output, but makes the actual filler hotter, so it will penetrate better. Eta: More specifically, you adjust voltage with the dial, and the wire speed changes the current. More wire speed = more current. At the edge of a welders capability, it will usually have voltage but run out of current capacity, so you lower then wire speed in order to get the wire temperature hotter to penetrate deeper.
The higher the wire speed, the more times/second it touches the puddle (the more times/second it is directly shorting to the work), so the more current it carries (more fresh wire = cooler wire = less resistance), and the faster you travel.
The lower the wire speed, the longer the arc (heating up the base material and wire), the higher wire resistance (because the wire is hotter) the less current it carries, and the slower the travel speed, which gives it more time to heat up the base material.
Mike