Anybody ever use nitrogen for cutting gas on a conventional plasma? I have a Hypertherm 1250 on a Dynatorch 5 x 10 table and cut some aluminum parts. When using shop air the edge of the cut is oxidized which requires alot of grinding and prep work before I can Tig weld the joint. I know using nitrogen could be costly however I only cut a couple of these parts a month and could easily add the cost into the job. Anybody ever try it? Maybe Jim Colt could chime in? Here is some food for thought, http://www.praxair.com/praxair.nsf/AllContent/641292709A218CFC85256E7C006B9A69/$File/P-8236.pdf
http://www.centricut.com/New_Lessons/lessons_9.html