Plasma arc welding (PAW) is a advanced version of the tungsten inert gas (TIG) welding process. TIG welding has a free-burning arc, which is unstable and tends to wander in the low current range. With increase in current, the arc power increases and the arc diameter also increases. 

This leads to a lack of concentrated power in the work-piece, which results in a bigger seam and a larger heat-affected zone. Unlike TIG-welding torches, PAW uses a constricting nozzle and employs two separate gas flows, which give rise to a concentrated plasma arc having a narrow columnar shape.

Plasma welding is a superior variation of the TIG process that offers many advantages over TIG

Increase productivity by reducing down time.
Reduces scrap by providing consistent arc starting every time.
Improved process control for repeatable, high quality welds.
Reduces interference (noise) with computers, phone systems, CNC controllers

Simply stated, plasma welding is a variation to GTAW (TIG) that encloses the tungsten electrode in a protected environment and delivers the arc through a cooled copper tip. Enclosing the electrode protects it from contamination, thus substantially extending electrode life. The consistent arc shape of plasma results in onsistent weld for 8 fours or more of operation as compared to automated TIG welding, where deterioration of the exposed TIG electrode can result in weld arc variations in one hour or less of operation. Plasma welding uses a pilot arc to consistently transfer the arc to the work without the repeated use of high frequency current. The ultima 150 pilot arc circuit results in repetitive starting and reduces problems of high frequency interference with CNC controls, phones and computers which are common with the TIG process.

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