Plasma Arc Welding (PAW) is a high-precision welding process that uses a focused arc of ionized gas, or plasma, to melt and join materials. The process involves creating an electric arc between an electrode and the workpiece, which generates a high-temperature plasma that can reach temperatures exceeding 20,000 degrees Celsius. This allows for deep penetration and minimal distortion in the welded materials. PAW is commonly used for welding thin sections of metals and is particularly effective with materials like stainless steel and aluminum. It offers advantages such as improved control over the heat input and the ability to weld in various positions, making it suitable for complex applications in industries like aerospace and automotive.