advantage and disadvantag of non destructive testing.
Answers
Explanation:
Advantages of the penetrant method of Non-Destructive Examination are:
It is a very sensitive method, capable of finding extremely fine flaws
It can be used on magnetic and non-magnetic metals, some plastics and glass
Small objects, with awkward shapes, can be inspected
A power supply is not needed for some methods of penetrant testing
The method requires no great skill and is easy to understand
Lots of small articles, in batches, can be examined using automated systems
Disadvantages of the penetrant method of Non-Destructive Examination are:
Can only detect defects open to the surface
Preparation, before testing, can be time consuming and costly
The method takes time and can rarely be completed in less than 30 minutes
The method cannot normally be applied to painted objects
It is messy
Interpretation of results is sometimes difficult
There may be a problem disposing of contaminated cleaning and penetrant fluids
Dry, clean, conditions are essential, as is careful cleaning of the surfaces to be examined
The method is often abused and skimped, or not fully understood
There can be a fume exposure problem, particularly in confined spaces
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