Some Plasma Welding Questions

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Is the plasma welding process dc only or are there ac plasma machines too?  Can the dc plasma process be used to weld non-ferrous metals, and if so, what is the thickness range?MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op
Reply:Wikipedia (ask the audience) says PAW uses AC and DC. http://en.wikipedia.org/wiki/Plasma_arc_weldingThe Pro-Fusion website seems to indicate that PAW is most useful for delicate, thin and small welds.http://www.pro-fusiononline.com/welding/plasma.htmI used to think plasma was something to donate once every three months so you could get free coffee and cookies. City of L.A. Structural; Manual & Semi-Automatic;"Surely there is a mine for silver, and a place where gold is refined. Iron is taken from the earth, and copper is smelted from ore."Job 28:1,2Lincoln, Miller, Victor & ISV BibleDanny
Reply:LOL.  I used to donate plasma so I could have beer and pizza money when I was in college.  Haven't thought about that in years.  Yeah I've read about dc plasma being used for very intricate thin weldments.  The plasma welding machines I've found on the net so far have all been dc, which is why I was asking about ac.  I know that dc welding of aluminum with tig is only for very thick weldments, so that's why I was wondering if  dc plasma welding of aluminum would be the same story.MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op