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Non destructive testing
1. PRESENTATION ON NON DESTRUCTIVE
TESTING (NDT)
PRESENTED TO : Dr. P.K. GUPTA
Prof. ARPIT RASTOGI
PRESENTED BY : SACHIN JHA
(1403040090)
DEPARTMENT OF MECHANICAL ENGINEERING
INDERPRASTHA ENGINEERING COLLEGE
2. NON DESTRUCTIVE TESTING
Non-destructive testing (NDT) is a wide group
of analysis techniques used in science and
technology industry to evaluate the properties
of a material, component or system without
causing damage.
3. IMPORTANCE OF NDT
Accident prevention and to reduce costs
To improve product reliability
To determine acceptance to a given
requirement
To give information on repair criteria.
4. SOME OF THE METHODS USED
Visual Inspection
Liquid Penetrant Inspection
Acoustic Emission
Magnetic Particle Inspection
Eddy Current Inspection
Ultrasonic Inspection
Radiographic Inspection
5. LIQUID PENETRANT INSPECTION
Liquid Penetrant inspection is also called as
dye penetrant inspection.
Penetrant may be applied to the test
component by dipping, spraying, or brushing.
After adequate penetration time, the excess
penetrant is removed, developer is applied.
Developer helps to draw penetrant out of the
flaw where an invisible indication becomes
visible to the inspector.
7. APPLICATION OF PENETRANT
The surface is allowed to get dry and penetrant is then applied on the
surface.
Penetrants are of two types:
Fluorescent
Visible
Based on the application and nature of material, any one of the
above penetrant is selected.
8. REMOVAL OF PENETRANT
The excess penetrant is removed from the surface using any of
the given methods:
Method A - Water Washable
Method B - Post-Emulsifiable, Liophilic
Method C - Solvent Removable
Method D - Post-Emulsifiable, Hydrophilic
9. APPLICATION OF DEVELOPER
The role of the developer is to pull the trapped penetrant material
out of defects and spread it out on the surface of the part so it
can be seen by an inspector. There are following types of
developers available
Dry Powder
Water Soluble
Water Suspendable
Nonaqueous Type 1 Fluorescent (Solvent Based)
Nonaqueous Type 2 Visible Dye (Solvent Based)
Special Applications
10. LIMITATIONS OF DYE PENETRANT
TESTING
Need access to test surface
Defects must be surface breaking
Decontamination & pre cleaning of test
surface may be needed
Vapour hazard
Very tight and shallow defects difficult to find
Depth of flaw not indicated
11. APPLICATION AREAS OF NDT
Aerospace
Automobile
Bridges
Pipeline
Power plant
Pressure vessel
Rail roads
Ship building
Storage Tanks