Electromagnetic Testing-Chapter 3 Electromagnetic Testing - Paul E

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1、ElectromagneticTestingChapter3-ElectromagneticTestingMyASNTLevelIIIPre-ExamPreparatorySelfStudyNotes6thApril2015CharlieChong/FionZhangSubmarineApplicationsCharlieChong/FionZhangSubmarineApplicationsCharlieChong/FionZhangSubmarineApplicationsCharlieChong/FionZhangSubmarineApplicationsCharlieChon

2、g/FionZhangSubmarineApplicationsCharlieChong/FionZhangSubmarineApplicationsCharlieChong/FionZhangSubmarineApplicationsCharlieChong/FionZhangSubmarineApplicationsCharlieChong/FionZhangCharlieChong/FionZhangFionZhangatShanghai6thApril2015http://meilishouxihu.blog.163.com/CharlieChong/FionZhangCha

3、rlieChong/FionZhangCharlieChong/FionZhanghttp://greekhouseoffonts.com/GreekletterCharlieChong/FionZhangIVONATTSCapable.CharlieChong/FionZhanghttp://www.ivona.com/en/Chapter3-ElectromagneticTestingPaulE.MCharlieChong/FionZhangChapter3.ELECTROMAGNETICTESTINGMETHODIntroduction;Thischapterdescribes

4、eddycurrent,leakageflux,andmagnetoelastictechniques.Eddycurrenttestinginvolvestheuseofalternatingmagneticfieldsandcanbeappliedtoanyconductor.Leakagefluxtestinginvolvestheuseofapermanentmagnet,DCorACelectromagneticfields,andcanbeappliedonlytoferromagneticmaterials.Ineddycurrenttesting,thealterna

5、tingmagneticfieldsetsupcirculatingeddycurrentsinthetestpart.Anyparameterthataffectstheelectricalconductivityofthetestareacanbedetectedwiththeeddycurrents.Withthefluxleakagetechnique,anydiscontinuitythatproduceslinesofleakagefluxinthetestareacanbedetected.Themagnetoelastictechniqueisusedforchara

6、cterizinganddeterminingtheamountofresidualstressinmagneticmaterialsbymeasuringmagneticor“Barkhausennoise.”CharlieChong/FionZhangIntroductiontoNondestructiveTesting:ATrainingGuide,SecondEdition,byPaulE.MixThesetechniquescanbecombinedwithothermethods,suchasultrasonictestingandlaserdimensionalmeas

7、uringtoachievemultifunctionhigh-speedtestingofoilfielddrillingpipesandotherpipingsystemsthataresubjecttostringentoverallqualityrequirements.High-speedautomatictestingispossibleusingmultipleNDTmethodsbecausetheycanbeelectronicallyg