Non-Destructive Testing

Unit-I:
Introduction:
Scope and advantages of NDT, Comparison of NDT with Destructive Testing, some commonNDT
methods used since ages, Terminology, Flaws and Defects, Visual inspection, Equipmentused for visual
inspection. Ringing test, chalk test (oil whitening test). Uses of visual inspectiontests in detecting
surface defects and their interpretation, advantages & limitations of visualinspection.
Unit-II:
Tests:
Die penetrate test (liquid penetrate inspection), Principle, scope. Equipment & techniques, Testsstations,
Advantages, types of penetrants and developers, Zyglo test, Illustrative examples andinterpretation of
defects.
Magnetic particle Inspection – scope and working principle, Ferro Magnetic and
Nonferromagneticmaterials, equipment & testing. Advantages, limitations Interpretation of results,DC
& AC magnetization, Skin Effect, use of dye & wet powders for magna glow testing,different methods
to generate magnetic fields, Applications.
Unit-III:
Radiographic methods:
Introduction to electromagnetic waves and radioactivity, various decays, Attenuation ofelectromagnetic
radiations, Photo electric effect, Rayleigh’s scattering (coherent scattering),Compton’s scattering
(Incoherent scattering), Pair production, Beam geometry and Scatteringfactor.
X-ray radiography: principle, equipment & methodology, applications, types of radiations
andlimitations. γ-ray radiography – principle, equipment., source of radioactive materials &technique,
advantages of γ-ray radiography over X-ray radiography Precautions against radiationhazards. Case
Study - casting and forging.
Unit-IV:
Ultrasonic testing methods:
Introduction, Principle of operation, Piezoelectricity. Ultrasonic probes, CRO techniques,advantages,
Limitation & typical applications. Applications in inspection of castings, forgings,Extruded steel parts,
bars, pipes, rails and dimensions measurements. Case Study –Ultrasonography of human body.
Unit-V:
Special NDT Techniques:
Eddy Current Inspection:
Principle, Methods, Equipment for ECT, Techniques, Sensitivity,advanced ECT methods. Application,
scope and limitations, types of Probes and Case Studies.Introduction to Holography, Thermography and
Acoustic emission Testing.