NON-DESTRUCTIVE TESTING (NDT) is a process of inspecting, testing the materials, components or assemblies for finding the defects in them.

Today modern nondestructive tests are used in manufacturing, fabrication and in-service inspections to ensure product integrity and reliability, to control manufacturing processes, lower production costs and to maintain a uniform quality level. During construction, NDT is used to ensure the quality of materials and joining processes during the fabrication and erection phases, and in-service NDT inspections are used to ensure that the products in use continue to have the integrity necessary to ensure their usefulness and the safety of the public.

It should be noted that while the medical field uses many of the same processes, the term "nondestructive testing" is generally not used to describe medical applications.

NDT METHODS

In NDT, we use the following methods for finding the defects

PENETRANT TESTING
MAGNETIC PARTICLE TESTING
RADIOGRAPHIC TESTING
ULTRASONIC TESTING
VISUAL TESTING
RADIOGRAPHIC TESTING FILM INSPECTION
1. PENETRANT TESTING :

Penetrant Testing is also called as Liquid Penetrant Testing (LPT) or Dye Penetrant Testing. In this testing we use a chemical called Penetrant which can penetrate the material being tested and find defects. Penetrant is used to find only surface defects on the material.

Advantages & Disadvantages :

PT is one of the low-cost method used in NDT.

This method does not require the current supply

This method can find only surface defects, it cannot find defects inside the materials which are not open to the surface.

Where is PT used?

PT can be used on different materials like:

Metals (aluminum, copper, steel, titanium, etc.)
Glass
Many ceramic materials
Rubber
Plastics

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URL : https://www.riteacademy.co.in/

Blog ID : 268068

Category : Education

Date Added : 27-7-2021

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