Miller 180SD settings

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I just bought a 180sd and the book is a little hard to understand on setting the current flow. I've used the AC settiing on a couple Alum. tests, but I usually weld 16-20 ga. mild steel. It seems to weld better set to electrode negative. That doesn't seem right to me. somebody enlighten me on the neg-pos settings on the DC side on this machine please.
Reply:Most steels are welded using DCSP, or DCEN, whichever term you prefer.  In this ploarity, most of the heat is directed at the weld metal, and results from current flow toward the weld metal.  In DCEP, or DCRP, the heat's headed the other way, toward the tungsten!  that's why you need bigger tungsten's when welding DCRP.  Also, in DCRP, the cleaning action is greater, which you would want if you are welding magnesium or aluminum.  Also, DCRP is better on thin steels. AC provides a balance between cleaning and heating.  That's why those two alloys are mostly welded with AC.
Reply:I still don't know if I should be runing pos or neg to get the best results. I don't know what DCRP, DCEP, or any of that stuff means. I had a sycrhowave 300 before this new-fangled thing, and I could weld with that one!
Reply:dcsp=direct current straight polaritydcen=direct current electrode negative (same as above)dcrp=direct current reverse polaritydcep=direct current electrode positive (same as above)dcsp or dcen most tig welding set at thisdcrp or dcep most stick welding set at this these are the most common althought circumstances my require  you to change