NDT Methods
Non-Destructive Testing (NDT) is the examination of an object or material with technology that does not affect its future usefulness. NDT can be used without destroying or damaging a product or material. As it allows inspection without interfering with a product’s final use, NDT provides an excellent balance of quality control and cost-effectiveness.
Visual and optical testing.
Method of NDT using electromagnetic radiation at visible frequencies.
Nondestructive testing method using penetrant.
Penetrant:A liquid capable of entering discontinuities open to the test surface and that is adapted to the penetrant test process by being made highly visible in small traces. Fluorescent penetrants fluoresce brightly under ultraviolet light and visible penetrants are intensely colored to be readily visible on developer backgrounds when illuminated with visible light.
A nondestructive test method using magnetic leakage fields and indicating materials to disclose surface and near surface discontinuities.
Nondestructive testing using acoustic energy in the ultrasonic spectrum for interrogation.
Ultrasonic: Pertaining to acoustic vibration frequencies
greater than about 20 kHz.
The determination of the cause and significance of subsurface discontinuities indicated on a radiograph. The evaluation as to the acceptability or rejectability of the material is based on the judicious application of the radiographic specifications and standards governing the material.
Acoustic emission testing.
The transient elastic waves resulting from local internal micro displacements in a material.
The term also describes the technical discipline and measurement technique relating to this phenomenon.
An electrical current induced in a conductor by a time varying magnetic field.
A nondestructive testing method in which eddy current flow is induced in the test object. Changes in the flow caused by variations in the object are reflected into a nearby coil, coils, Hall effect device or other magnetic flux sensor for subsequent analysis by suitable instrumentation and techniques.
A method for the detection and analysis of a surface discontinuity or near-surface discontinuity using the flux that leaves a magnetically saturated, or nearly saturated, test object at a discontinuity.
Nondestructive testing method for detecting, locating or measuring leaks or leakage in pressurized or evacuated systems or components
