PAUT is an advanced Ultrasonic Testing method that has applications in Industrial Nondestructive Testing. Common applications are to find flaws in manufactured materials such as welds. Single-element (non- Phased Array) probes, known technically as monolithic probes, emit a beam in a fixed direction. To test or interrogate a large volume of material, a conventional probe must be physically scanned (moved or turned) to sweep the beam through the area of interest. In contrast, the beam from a phased array probe can be focused and swept electronically without moving the probe. The beam is controllable because a phased array probe is made up of multiple small elements, each of which can be pulsed individually at a computer-calculated timing. The term phased refers to the timing, and the term array refers to the multiple elements. Phased array Ultrasonic testing is based on principles of wave physics.