BS 6072-1981 Method for Magnetic particle flaw det

LicensedCopy:,UniversityofNewcastle,28November2003,UncontrolledCopy,(c)BSIBRITISHSTANDARDCONFIRMEDOCTOBER1986BS6072:1981(Reprinted,incorporatingAmendmentsNo.1toNo.3inclusive)MethodforMagneticparticleflawdetectionUDC620.179.141:621.317.4LicensedCopy:,UniversityofNewcastle,28November2003,UncontrolledCopy,(c)BSIBS6072:1981ThisBritishStandard,havingbeenpreparedunderthedirectionoftheMechanicalEngineeringStandardsCommittee,waspublishedundertheauthorityoftheExecutiveBoardandcomesintoeffecton27February1981©BSI11-1998ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceMEE/169Draftforcomment79/72952DCISBN0580118320CooperatingorganizationsTheMechanicalEngineeringStandardsCommittee,underwhosedirectionthisBritishStandardwasprepared,consistsofrepresentativesfromthefollowing:Theorganizationsmarkedwithanasteriskintheabovelist,togetherwiththefollowing,weredirectlyrepresentedontheTechnicalCommitteeentrustedwiththepreparationofthisBritishStandard:AssociationOfficesTechnicalCommittee*DepartmentofIndustry(NationalAssociationofConsultingEngineersEngineeringLaboratory)*AssociationofHydraulicEquipmentDepartmentofTrade(MarineDivision)ManufacturersDepartmentofTransportAssociationofMiningElectricalandElectricitySupplyIndustryinEnglandandMechanicalEngineersWales*BritishCompressedAirSocietyEngineeringEquipmentUsers’Association*BritishElectricalandAlliedManufacturers’FederationofManufacturersofConstructionAssociation(BEAMA)*EquipmentandCranesBritishGasCorporationHealthandSafetyExecutive*BritishGearManufacturers’AssociationInstitutionofGasEngineersBritishInternalCombustionEngineInstitutionofMechanicalEngineersManufacturers’AssociationInstitutionofPlantEngineersBritishPumpManufacturers’AssociationInstitutionofProductionEngineers*BritishSteelCorporationLloyd’sRegisterofShippingBritishSteelIndustry*LondonTransportExecutiveBritishValveManufacturers’AssociationLtd.MachineToolIndustryResearchAssociationCbmpeMinistryofDefence*CharteredInstitutionofBuildingServicesNationalCoalBoard*CrownAgentsforOverseaGovernmentsandOilCompaniesMaterialsAssociation*AdministrationsProcessPlantAssociationDepartmentoftheEnvironment(PSA)SocietyofMotorManufacturersandTradersDepartmentofIndustryLimited*(MechanicalEngineering)TelecommunicationEngineeringandManufacturingAssociation(TEMA)BNFMetalsTechnologyCentreSocietyofBritishAerospaceCompaniesBritishAirwaysLimitedBritishChemicalEngineeringContractors’SteelCastingResearchandTradeAssociationAssociationUnitedKingdomAtomicEnergyAuthorityBritishInstituteofNon-destructiveTestingWater-tubeBoilermakers’AssociationBritishNon-ferrousMetalsFederationWeldingInstituteInstituteofQualityAssuranceCooptedexpertNon-destructiveTestingCentreAmendmentsissuedsincepublicationAmd.No.DateofissueComments3960September1982Indicatedbyasidelineinthemargin4542June1984Indicatedbyasidelineinthemargin4843April1986IndicatedbyasidelineinthemarginLicensedCopy:,UniversityofNewcastle,28November2003,UncontrolledCopy,(c)BSIBS6072:1981©BSI11-1998iContentsPageCooperatingorganizationsInsidefrontcoverForewordiii0Introduction11Scope12References13Definitions14Magnetizingapparatusandassociatedequipment15Detectingmedia26Safetyprecautions27Testingprocedures38Surfacepreparation49Magnetization410Currentflowtechnique611Threadingbarorcabletechnique712Rigidcoiltechnique713Flexiblecabletechnique(coiltechniqueusingaflexiblecable)814Flexiblecabletechnique(usingaflexiblecableadjacenttothetestsurface)915Magneticflowtechnique916Inducedcurrentflowtechnique1017Currentflow(prods)technique1018Applicationofdetectingmedium1119Viewing1120Recordingofindications1221Reporting1222Demagnetization1223Cleaning13AppendixASelectionoftesttechniquesformagnetizingmaterialorcomponentsofspecificgeometricshape18AppendixBMethodsfordeterminingtheinspectedareaswhenusingthecurrentflow(prods)technique22AppendixCTestpiecesandtestprocedure23AppendixDReport,techniqueandproceduresheets25AppendixEPreservationofindications26Figure1—Currentflowtechnique13Figure2—Threadingbarorcabletechnique14Figure3—Flexiblethreadingbartechnique14Figure4—Flexiblecabletechnique(usingcablewoundthroughthespecimen)14Figure5—Coiltechnique14Figure6—Flexiblecabletechnique(usingcablewoundroundthespecimen)15Figure7—Magneticflowtechnique15Figure8—Inducedcurrentflowtechnique16Figure9—Currentflowtechnique(prods)16LicensedCopy:,UniversityofNewcastle,28November2003,UncontrolledCopy,(c)BSIBS6072:1981ii©BSI11-1998PageFigure10—Searchpatternwhichisacceptablewhenusingthecurrentflow(prods)techniquetoinspectflatsurfacesandthosewithradiiofcurvaturegreaterthanhalftheprodspacing(peakcurrentvaluenotlessthan7500ampspermetreofprodspacing)17Figure11—Searchpatternforthecurrentflow(prods)techniquewhenthepeakcurrentvalueis4700ampspermetreofprodspacing17Figure12—Detailsofstandardtestpieceforcurrentflowchecking24Figure13—Testpieceforcheckingmagneticflowandcoilmagnetization24Table1—Factorbywhichindicatedcurrentvaluesaremultipliedtoobtainpeakvalues4Table2—Currentvaluesforgeneralengineeringapplications8Table3—Currentvaluesforaerospaceapplicat