基于美国ASME标准的磁粉检测规程Word文档格式.docx

基于美国ASME标准的磁粉检测规程Word文档格式.docx

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8.Demagnetization

9.ReexaminationforrepairedAreaandNonconformityControl

10.PostCleaning

11.Report

SUSPENSIONCONCENTRATIONCALIBRATIONRECORD

MAGNETICPARTICLEEXAMINATIONINSTRUCTION

MAGNETICPARTICLEEXAMINATIONREPORT

1.1.Thisprocedureisappliedtodetectcracksandotherdiscontinuitiesonornearthesurfaceofferromagneticmaterials,usingwetmagneticparticleandACorDCyoketechniquewithcontinuousmagnetizationmethod

1.2.ThisprocedureisappliedtoweldsandmaterialsofASMECodepressurevesselsfabricatedaccordingtoASMECodeSectionⅧDivision1.

2.QualificationofNDEPersonnel

AllpersonnelperformingmagneticparticleexaminationshallbequalifiedandcertifiedinaccordancewiththerequirementsofHT’sWrittenPracticeforNDEPersonnelTraining,Examination,QualificationandCertificationbasedontherequirementsof“SNT-TC-1A”（CurrentCodeacceptededition）

ThisprocedureshallbesupplementedbyMAGNETICPARTICLEEXAMINATIONINSTRUCTIONwhichshallbeissuedtoeveryproducttobeexaminedandinwhichmoredetailparametersarespecified.TheInstructionshallbepreparedbylevelⅡ,approvedbylevelⅢNDEexaminer,

4.MagnetizingEquipmentandMaterials

4.1Magnetizingequipment

4.1.1ThemagnetizingequipmentshowninTable1shallbeused.

Table1

Manufacturer

Model

FactoryNo.

Type

Technique

SHEYANG

CYE-1

030

ACorDC

YokeTechnique

4.1.2.CalibrationofEquipment

Themagnetizingequipmentshallbecalibratedatleastonceayear,orwhenevertheequipmenthasbeendamaged.Iftheequipmenthasnotbeeninuseforayearormore,calibrationshallbedonepriortofirstuse.ThemagnetizingequipmentshallbecalibratedinaccordancewiththerequirementsofMAGNETICPARTICLEEQUIPMENTCALIBRATIONPROCEDURE

4.2.MagneticParticleFieldIndicator

Themagneticparticlefieldindicatorshowninfig1shallbeusedtodemonstratethedirectionofmagneticflux

4.3ExaminationMedium

4.3.1MagneticparticleshowninTable2shallbeused.Thecoloroftheparticles

shallprovideadequatecontrastwiththesurfacebeingexamined.Ifitisnot

adequate,anothercolorshallbeselectandredemonstrationshallberequired

更多资料：

无损检测招聘网http:

//ndtcn.org

中国无损检测论坛http:

//bbs.ndtcn.org

中国焊接论坛weld.orgTable2

Name

Type/color

Fineness

ShanghaiMaterial

Res.Institute

Magnetic

Slurry

BW-1/Black

300Mesh

4.3.2.WaterVehiclesandSuspension

Mixingratioofratermediummagneticsuspensionis11.0-22.0gmagneticslurryper1000mlwater.

4.3.3ConcentrationofWetMagneticparticleSuspension

TheconcentrationisnormallydeterminedbymeasuringitssettlingvolumethroughtheuseofanASMEpear-shapecentrifugetube.

Beforesampling,runthesuspensionforatleast30-min.toassurethoroughmixingofallparticles.Takea100mlportionofthesuspensionandallowittosettleapproximately30min.Thevolumesettlingoutatthebottomofthetubeisindicativeoftheparticleconcentrationinthebath.Bathconcentrationshallbeform1.2to2.4mlper100mlvehicles.ThecalibrationshallbeperformedbyMTlevelⅡorⅢandreviewedbyMTlevelⅢNDEExaminer.ThecalibrationresultsshallberecordedonCALIBRATIONRECORDFORSUSPENSIONCONCENTRATION.

4.4Illumination

Whennaturallightisnotenoughforexaminationandevaluation,adequateilluminationisrequiredensuringadequatesensitivityduringtheexaminationandevaluation.

5.SurfacePreparation

5.1Satisfactoryresultsareusuallyobtainedwhenthesurfaceisintheas-welded,as-rolled,as-cast,oras-forgedconditions.However,surfacepreparationbygrindingormachiningmaybenecessarywheresurfaceirregularitiescouldmaskindicationsduetodiscontinuities.

5.2Priortomagneticparticleexamination,thesurfacetobeexaminedandalladjacentareaswithinatleast1in.（25mm）shallbedriedandfreeofalldirt,grease,lint,andscale,weldingfluxandspatter,oilorotherextraneousmatterthatcouldinterferewiththeexamination.

5.3Cleaningofthetestsurfacemaybeaccomplishedbydetergents,organicsolvents,ormechanicalmeans.

5.4.Whencoatingisleftontheareasofthepartbeingexamined,allcoatingshallberemovedpriortoexamination

LevelⅡexaminershallperformmagneticexaminationinaccordancewiththerequirementsoftheInstruction,andshallrecordexaminationdataontheMAGNETICPARTICLEEXAMINATIONREPORT.Thetemperatureofthewetmagneticparticlesuspensionandthesurfaceofthepartshallnotexceed135℉（57.3℃）.

6.1MagnetizingTechnique

TheACorDCyoketechniqueshallbeappliedtodetectdiscontinuitiesonthesurfaceofthepart.Exceptformaterials1/4in.orless,ACyokesaresuperiortodetectsurfacediscontinuities.

6.2.MethodofExamination

Examinationshallbedonebythe“wetmagneticparticlecontinuousmethod;

thatis,themagnetizingcurrentremainsonwhiletheexaminationmediumisbeingappliedandwhileexcessoftheexaminationmediumisbeingremoved.Thedurationofthemagnetizingcurrentistypicallyontheorderof1-3s.

6.3ApplicationofwetmagneticParticles

Wetmagneticparticlebathshallbeappliedbysparing,brushingorflowingovertheareatobeexaminedduringtheapplicationofthemagnetizingfield.Caremustbetakentopreventapplicationbeforeremovingthemagneticfield.

6.4DirectionofMagnetization

Eachareamustbemagnetizedinatleasttwodirectionsapproximatelyatrightangletoeachothersothatalldiscontinuitiesonthesurfaceofpartmaybedetectable（seeFig.2）.Theindicationsarenotnormallyobtainedwhendiscontinuitiesareparalleltoappliedmagneticfield.

6.5ExaminationCoverage

Allexaminationshallbeconductedwithsufficientoverlaptoassure100%coverageattherequiredsensitivity.Theexaminationareashallbemarkedwithlinetosatisfy100%coverageasshowninFig.2.

6.6MagnetizingCurrent

Alternatingordirectmagnetizingcurrentshallbeusedtoestablishpartmagnetization.

6.7MagneticFieldStrengthforYokeTechnique

Theliftingpowerrelatestotheelectromagneticstrengthoftheyoke.Alternatingcurrentelectromagneticyokeshallhavealiftingpowerofatleast10lb（44.5N）atthemaximumpolespacingthatwillbeused.Directcurrentelectromagneticyokeshallhavealiftingpowerofatleast40lb（178N）atthemaximumpolespacingthatwillbeused.

6.8.EvaluationofSystemSensitivity

Whenitisnecessarytoverifytheadequacyordirectionofthemagnetizingfield,themagneticparticlefieldindicatordescribedinTable2shallbeusedbypositioningtheindicatoronthesurfacetobeexamined.Asuitablefluxorfieldstrengthisindicatedwhenaclearlydefinedlineofmagneticparticlesformsacrossthecopperfaceoftheindicatorwhenthemagneticparticlesareappliedsimultaneouslywiththemagneticforce.Whenaclearlydefinedlineofparticlesisnotformed,orisnotformedinthedesireddirection.Themagnetizingtechniqueshallbechangedoradjusted.

LevelⅡorⅢNDEexaminershallobserveandevaluateindicationsinaccordancewiththeacceptancestandardsofASMECode,andshallrecordevaluationresultontheMAGNETICPARTICLEEXAMINATIONREPORT

7.1.Theilluminationduringobservationandevaluationshallsatisfyrequirementofpara.4.4.

7.2Discontinuitiesonthesurfaceareindicatedbyretentionoftheexaminationmedium.However,localizedsurfaceirregularitiesduetomachiningmarksorothersurfaceconditionsmayproducefalseindications.

7.3.Broadareasofparticleaccumulation,whichmightmaskindicationfromdiscontinuities,areprohibited,andsuchareasshallbecleanedandreexamined.

7.4EvaluationofIndications

7.4.1Indicationswillberevealedbyretentionofmagneticparticles,allsuchindicationsarenotnecessarilyimperfectionshowever,sinceexcessivesurfaceroughness,magneticpermeabilityvariations（suchasattheedgeofheataffectedzoned）,etc.mayproducesimilarindications.

Note:

Whenexaminecornerweldedjointssuchasnozzletoshelljoint,adequateshoesshallbeusedtofittheshapebeingexamined.TheyokefixedwithshoesshallverifytheliftingpowerrequiredinPara.6.6.

Fig.2Max.PitchandDirectionforYokeTechnique.

Anindicationistheevidenceofamechanicalimperfection.

Onlyindications,whichhaveany,dimensiongreaterthan1/6in.shallbeconsideredrelevant.

（a）Alinearindicationisonehavingalengthgreaterthanthreetimesthewidth.

（b）Aroundindicationisoneofcircularorellipticalshapewithalengthequaltoorlessthanthreetimesitswidth.

（c）Anyquestionableordoubtfulindicationsshallbereexaminedtodeterminewhetherornottheyarerelevant.

7.4.2AcceptanceStandards

TheseacceptancestandardsshallapplyunlessothermorerestrictivestandardsarespecifiedforspecificmaterialsorapplicationswithinthisDivision.

Allsurfacestobeexaminedshallbefreeof:

（a）Relevantlinearindications.

（b）Relevantroundedindicationsgreaterthan3/16in.

（c）Fourormorerelevantroundedindicationsinalineseparatedby1/16in.orless,edgetoedge.

（d）Anindicationofanimperfectionmaybelargerthantheimperfectionthatcausesit.However,thesizeoftheindicationisthebasisforacceptanceevaluation.

Whenresidualmagneticforthinterferethesubsequentprocessingorusage,andequippedinthedrawings,specificationorpurchaseorder,thepartorareashallbedemagnetized.

8.1DemagnetizationMethods

8.1.1WithdrawalfromAlterna