Flaw detection is the most commonly used technique among all the applications of industrial ultrasonic testing. Generally, sound waves of high frequency are reflected from flaws and generate clear echo patterns.

Portable instruments record and display these echo patterns. Ultrasonic testing is a safe testing method that is widely used in various service industries and production process, particularly in applications where welds and structural metals are used.

Advantages of ultrasonic testing include:

- Access is only required from one side for pulse-echo mode
- The depth of penetration is superior to other methods
- Highly accurate flaw sizing and shape
- Minimal part preparation is required.
- Results are in real-time