It is essential to know the characteristics of a product to assess its quality through various tests, Further after testing the product must be in fit condition for a use.
Earlier the testing was done by means of destructive testing. In destructive testing the material is subjected to loads and its mechanical properties are determined.
These destructive tests are difficult to be performed and are expensive. Moreover the material is subjected to damage, so in order to avoid this, non destructive testing is done. Non destructive testing is the process in which the object under test is not destroyed. It is vital for maintaining and controlling properties of all types of components and structures. These tests are employed for finished products to determine internal defects (blow holes, slag inclusions etc.) and surface defects. Non destructive techniques include inspection detection and measurement of the parameters of any material component or an assembly without altering its property or affecting its serviceability.
The mini project deals with non destructive testing of heat exchanger components. Theses tests include liquid penetrant test, magnetic particle test, radiography test, ultrasonic test. Results of NDT help quality control department to accept or reject the tested componentCONTENTS
2.1. Need for NDT
2.2. History and notable events in NDT
2.3. Types of defects detected by NDT
2.4. Types of NDT
2.5. Limitations of NDT
3. MAGNETIC PARTICLE TESTING
3.1. Basic Principle
3.2. Methods of Magnetization.
4. RADIOGRAPHY TESTING
4.2. Advantages & Disadvantages
4.3. Recording Films
4.4. Characteristics of Films
5. ULTRASONIC TESTING METHOD
5.2. Generation of Ultrasonic Waves
5.3. Ultrasonic Testing Methods
5.4. Ultrasonic Testing Systems