Your machine must use 50% inductance as the preset. -50 would be 0 inductance. The more - you go, you will get a faster freeze and a narrower bead. You can use a low setting for sheet metal or overhead. As you go up the + scale, the puddle becomes more fluid and wider with less spatter but it makes vertical and overhead more difficult.I'm just doing flux core right now because i can't really afford the gas but when i turn it all the way negative it just beads up on the surface glowing red with little penetration and when i turn it the other it penetrates a lot but still leaves it's it glowing