Dual Flow Plasma(a) Dual flow plasma cutting. Dual flow plasma cutting provides a secondary gas blanket around the arc plasma, as shown in figure 10-73.
The usual orifice gas is nitrogen. The shielding gas is selected for the material to be cut.
For mild steel, it may be carbon dioxide (CO2) or air; for stainless steals, CO2; and an argon-hydrogen mixture for aluminum. For mild steel, cutting speeds are slightly faster than with conventional PAC, but the cut quality is not satisfactory for many applications.
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