01053015 MANUFACTURING; Department of Mechanical Engineering, KMITL
©2010 John Wiley & Sons, Inc. M P Groover, Principles of Modern Manufacturing
Plasma Arc Welding (PAW)
Special form of GTAW in which a constricted plasma arc is directed at weld area
Tungsten electrode is contained in a nozzle that focuses a high velocity stream of inert gas (argon) into arc region to form a high velocity, intensely hot plasma arc stream
Temperatures in PAW reach 28,000°C (50,000°F), due to constriction of arc, producing a plasma jet of small diameter and very high energy density