Non-Destructive Testing is a specialized branch of Engineering Science, which uses Ionizing Radiation, Ultrasonic Sound Waves, Magnetic Flux etc. to test the integrity of casting, forging welding etc. without impairing its usefulness.

Radiographic Testing, Ultrasonic Testing, Magnetic Particle Testing, Penetrant Testing, Visual Testing, Eddy Current Testing, Leak Testing, Infrared Thermography, Vibration Analysis, Neutron Radiography and Acoustic Emission are the recognized NDT methods.