chris, i looked at the V205; i thought square wave, triangular, sinusiodal , and variable frequency are standard features. the part # is K1855-1. the other perc with TIG vs MIG, for what i do, is the weld is "flat", flat enough that i can put a collar on without grinding. i agree that any method of welding can be made to look invisible, but at what time and material cost (abrasives) expense? i think it is more efficient, cosmetically, to use TIG. i am still in the early stages, but i think that this is what i am after. i am not working with aluminum yet, so i dont have any experience with the wave options. D/C electrode neg for now. if you do anything cool with mild steel, share...thanks