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WhatisNDT?
AboutNDT
Acousticmethods
Acousticemission(AE)
Resonantinspection
Acousticranging
Coatingthicknessmeasurementmethods
Electromagneticmethods
Magneticparticleinspection(MPI)
Magneticfluxleakagemethods
Eddycurrenttesting
ACFMtechnique
Potentialdropflawdetectionandsizing
Erosioncorrosion
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Liquidpenetrantinspection
Opticalmethods
Visualinspection
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Laserbasedinspection
Thermography
Radiography
Realtimeradiographyandradioscopy
Neutronradiography
Stressmeasurement
Ultrasonicmethods
Ultrasonicflawdetection
Ultrasonicthicknessgauging
Ultrasonicadvancedmethods
Othermethods
WhatisNDT? AboutNDT
AboutNDTWhatisNDT?
Nondestructivetesting(NDT)isthebranchofengineeringconcernedwithallmethodsofdetectingandevaluatingflawsinmaterials.Flawscanaffecttheserviceabilityofthematerialorstructure,soNDTisimportantinguaranteeingsafeoperationaswellasinqualitycontrolandassessingplantlife.Theflawsmaybecracksorinclusionsinweldsandcastings,orvariationsinstructuralpropertieswhichcanleadtolossofstrengthorfailureinservice.
Nondestructivetestingisusedforinserviceinspectionandforconditionmonitoringofoperatingplant.Itisalsousedformeasurementofcomponentsandspacingsandforthemeasurementofphysicalpropertiessuchashardnessandinternalstress.
TheessentialfeatureofNDTisthatthetestprocessitselfproducesnodeleteriouseffectsonthematerialorstructureundertest.
ThesubjectofNDThasnoclearlydefinedboundariesitrangesfromsimpletechniquessuchasvisualexaminationofsurfaces,throughthewellestablishedmethodsofradiography,ultrasonictesting,magneticparticlecrackdetection,tonewandveryspecialisedmethodssuchasthemeasurementofBarkhausennoiseandpositronannihilation.
NDTmethodscanbeadaptedtoautomatedproductionprocessesaswellastotheinspectionoflocalisedproblemareas.
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