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Methods of Nondestructive testing

NDT involves inspection of components and materials in such a way that allows materials to be examined without making changes in their usefulness. It is also referred to as NTD and NDE that is a non-destructive examination or evaluation. NTD techniques and their results depend upon highly trained technicians with experience. Various methods can be used in Nondestructive Testing. Some common methods are described here –

Visual Testing

Visual testing is the most basic method of testing without making any alteration in the material. Visual testing can be performed by the naked eye by the inspectors by visually reviewing the object or material. For indoor visual testing flashlights, it adds depth to the object being examined. It can be also done with a remote visual inspection tool.

Ultrasonic testing

It is the process of transmitting high-frequency sound waves to the material in order to identify the changes in the material’s property. Ultrasonic Testing uses sound waves to find the remove the imperfections on the surface of the material. One of the most common methods of ultrasonic testing method is pulse-echo.

Magnetic particle testing

This technique is also called magnetic particle inspection (MPI). As the name says this technique is used for metals that have a magnetic property like iron, nickel, cobalt, and some alloys. Like ultrasonic testing, it also requires considerable training and expertise.

Liquid penetrant Testing 

It is one of the oldest and popular methods of non-destructive testing. Liquid penetrant testing is used in a wide variety of industries. This technique is popular because it requires no cost special equipments and relies on limited experience and training. It is widely accessible to companies of all sizes.

Radiographic testing

This testing technique uses radioactive or X- rays to examine the components in the same way as doctors use X-rays to examine the structure inside a human body. This type of technique works by sending radiation through components and measuring the amount that results on the opposite side.

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