Did some experimenting in shed this eve. In order to get consistency i put a new tip on and fitted a spot weld shroud so i would have identical standoff. Started with volt 1 wire 1.5 straight away got burn back and a weird hiss. Put the volts to 0.9ish and wire to 1.8 ish a good angry sizzle and probably a little too much penetration after a spot weld. So It seems welder is a little hotter on its factory settings than i thought an i need to learn to keep torch at a better distance consistantly.