Have been welding 1/8" material which according to the chart from Victor splits the line between the #2 and #3 nozzles. I thought maybe the smaller nozzle would give a little better control but I had a hard time getting enough heat into the parts and when I brought the pressure up into the high range I found the flame to be harsh and it wanted to blow the puddle out. #3 on low seems to be where I want to be. Otherwise a great quality item, and excellent service and value from cyberweld.