Example: biology

MILITARY STANDARD - adc-ga.com

NOTMEASUREMENTSENSITIVEMIL-STD 1949A~~MAY19(J9,..,SUPERSEDINGMIL-STD 19491 AUGUST198 MILITARYSTANDARDINSPECTION,MAGNETICPARTI CLE5II()I)ELIVEHALILEDATAREQLJIRE~UY rlllSDOCUMENTAMscl iiAAREANOT!,,[)1ST1 lll?UllONSTATEMEt{TAApprovedforpublicrel ease;. , , (recommendations,additions,deletions)and anypertinentdatawhichmaybeofuseinimprovi ngthisdocumentshouldbeaddressedto:Direct or, ,ATTN:SLCMT-MEE,Watertown,MA02172-0001by usingtheStandardizationDocumentImproveme ntProposal(DDForm1426) , *2* *wlOl* + , ,drawings, *lw9 *llll-l =l *l -w - sl -Indication, . l lIndication, Indication, * l. l * =l + l ll . \ * * ,.. ,..,.. ,; = + MIL-STD-1949 AcONTENTSC alculatingtheL/Dratioforcylindricalpart. ,.. *,**. **.**.**.**.**.l.<.** ~ ,.. :.. , l l llStamping, , , *.. ( *.. ) .. *., , standards , , standards , ,theissuesofthesedocumentsarethoselisted intheissueoftheDepartmentofDefenseIndexo fSpecificationsandStandards(DODISS)andsu pplementthereto, ,MagneticRubberDOD-F-87935-Fluid,Magneti cParticleInspection,Suspension(Metric)ST ANDARDSFEDERALFED-STD-31 ,LiquidPenetrantandMagneticParticleSound nessRequirementsForMaterials,PartsandWel dmentsNondestructiveTestingPersonnelQual ificationandCertificationCastings,Classi ficationandInspectionofCalibrationSystem sRequirementsUnlessotherwiseindicated,co piesoffederalandmilitaryfications,st]}

MIL-STD-1949A DEPARTMENT OF DEFENSE Washington, D.C. 20325 Inspection, Magnetic Particle 1. This Military Standard is approved for use by all Departments and

Tags:

  Standards, Military, Military standard

Information

Domain:

Source:

Link to this page:

Please notify us if you found a problem with this document:

Other abuse

Transcription of MILITARY STANDARD - adc-ga.com

1 NOTMEASUREMENTSENSITIVEMIL-STD 1949A~~MAY19(J9,..,SUPERSEDINGMIL-STD 19491 AUGUST198 MILITARYSTANDARDINSPECTION,MAGNETICPARTI CLE5II()I)ELIVEHALILEDATAREQLJIRE~UY rlllSDOCUMENTAMscl iiAAREANOT!,,[)1ST1 lll?UllONSTATEMEt{TAApprovedforpublicrel ease;. , , (recommendations,additions,deletions)and anypertinentdatawhichmaybeofuseinimprovi ngthisdocumentshouldbeaddressedto:Direct or, ,ATTN:SLCMT-MEE,Watertown,MA02172-0001by usingtheStandardizationDocumentImproveme ntProposal(DDForm1426) , *2* *wlOl* + , ,drawings, *lw9 *llll-l =l *l -w - sl -Indication, . l lIndication, Indication, * l. l * =l + l ll . \ * * ,.. ,..,.. ,; = + MIL-STD-1949 AcONTENTSC alculatingtheL/Dratioforcylindricalpart. ,.. *,**. **.**.**.**.**.l.<.** ~ ,.. :.. , l l llStamping, , , *.. ( *.. ) .. *., , standards , , standards , ,theissuesofthesedocumentsarethoselisted intheissueoftheDepartmentofDefenseIndexo fSpecificationsandStandards(DODISS)andsu pplementthereto, ,MagneticRubberDOD-F-87935-Fluid,Magneti cParticleInspection,Suspension(Metric)ST ANDARDSFEDERALFED-STD-31 ,LiquidPenetrantandMagneticParticleSound nessRequirementsForMaterials,PartsandWel dmentsNondestructiveTestingPersonnelQual ificationandCertificationCastings,Classi ficationandInspectionofCalibrationSystem sRequirementsUnlessotherwiseindicated,co piesoffederalandmilitaryfications,standa rds,andhandbooksareavailablefromtheNaval cationsandFormsCenter,(ATTN:NPODS),5801 TaborAvenue,philadelphia~PA19120-5099.]}

2 ,drawings, ,drawings, , (OSHA)CodeofFederalRegulationsisavailabl efromtheSuperintendentofDocuments, ,Washington,DC20402- U !Y2 UIREF! ,laps,seams,inclusions, ,billets,finishedandsemifinishedmaterial s,welds,andIn-se; ,termed fluxleakage=, ,applicationofsuitablypreparedmagneticpa rticleswhilethe-areaismagnetizedorbeingm agnetized,andsubsequentclassification,in terpretation, ,alengthatleastequaltoitsdepth, ,eticfields,perpendiculartooneanotherina planeparalleltothesurfacebeinginspecteds hallbeused, documentsshallspecifytheacceptablesizean dconcentrationofdiscontinuitiesforthecom ponent, ,Thewrittenproceduremaybeageneraloneifit clearlyappliestoallthespecifiedpartsbein gtestedandmeetstherequirementsof\. ,LevelIIIformagneticparticleinspection, , ( ).Areasoftheparttobeexamined(includeaske tchifnecessary).Directionsofmagnetizatio ntobeused,theorderinwhichtheyareapplied, (prods~yoke~cablewrap~etc). ,orthenumberofampere-turns~ (dryorwet,visibleorfluorescent,etc.)

3 Tobeused,themethodandequipmenttobeusedfo ritsapplication,and,forthecaseofwetparti cles, , ,filed, , ; (directmethod),byinducingacurrenttoflowi nthepartundertest(inducedcurrentmethod), orbyplacingthematerialwithinthemagneticf luxofanexternalsourcesuchasacoil(indirec tmethod).Thetypesofequipmentavailableinc ludeyokes,portableunits,mobileunits,stat ionaryunits,andspecialapplicationunits( multidirectionalfield).Thetypesofcurrent susedformagnetizationare7 MIL-STD-1949 Afull-waverectifiedalternatingcurrent,ha lf-waverectifiedalternatingcurrent, ,asoutlinedherein, ,butarenotlimitedto,forging,heattreating ,plating,passivation,coldforming,welding ,grinding,straightening,machining, , , (100foot-candles).Fluorescentmagneticpar ticleinspectionshallbeperformedinadarken eda reawithamaximumambientvisiblelightlevelo f20lux(2foot-candles). +4/cu12whenmeasuredat380mm(15inches) (drymethod),forsuspensionatagivenconcent rationinasuitableliquid(wetmethod),forsu spensioninapolymerizeablematerial(magnet icrubbermethod),orforsuspensioninaslurry (magneticpainting).

4 ,shape, ,freefromrust,grease,paint, :MIL-STD-1949A-Placeaconductorwithadiame terbetween25and31mm( )andalengthgreaterthan40cm(16inches) , ( ). ,AMS3042,AMS3043,AMS3044,AMS3045,orAMS30 46, ,theparticlesshallshowindicationsasliste dintableIonthetestringspecimenoffigure1u singthefollowingprocedure:Placeaconducto rwithadiameterbetween25and31m( )andalengthgreaterthan40cm(16inches) (examinationofnonfluorescentbathsshallbe underavisiblelightofnotlessthan1000lux( );examinationoffluorescentbathsshallbeun derablacklightwithaminimumintensityof100 0~W/cm2atthesurface).Minimumnumberofhole indicationsshallmeetorexceedthosespecifi edintableI.\ (Type I) ,AMS2641(Type11) ,itshallbesuitablyconditionedtoprovidefo rproperwetting,particledispersion, ( ).Generally, , ,clean,dry,andfreeofoil,scale,machiningm arks, ( ) ( ) , , ,smallopeningsandoilholesleadingtopassag esorcavitiesthatcouldentraporremainconta minatedwithinspectionmediashallbeplugged ormaskedwithasuitablenon-abrasivemateria lwhichcanbereadilyremovedand,inthecaseof engineparts, ,suchascertain-non-metallics, , (electromagneticprobes)formagneticpartic leinspection, ,half-waverectxfiedalternatingcurrent, smanualortheequipmentmanufacturershouldb econsultedtodeterminewhatcorrectionfacto r,ifany, (3/4inch)inthicknessorless, (90to115A/in) (3/4inch)inthickness, (100to125A/in) (2inches)orgreaterthan200mm(8inches).

5 Theeffectivewidthofthemagnetizingfieldwh enusing ( headshots-)thecurrentshallbefrom12 Apermmofpartdiameterto32 Apermmofpartdiameter(300to800A/in). (500A/in)orlowerwiththehighercurrents(uP to800A/in)beingusedtoinspectforinclusion $ ,upto40 Apermm(1000A/in) ~thediametershallbethelargestdistancebet weentwopoints, , ,2( Directcircularmagnetization ) ,Whentheconductorpassingthroughtheinside ofthepartisplacedagainstaninsidewallofth epart, ( Directcircularmagnetlzatlon ) (interiororexterior)whichiseffectivelyma gnetizedshallbetakenasfourtimesthediamet erofthecentralconductor , ~orSectionofthepart,tobetested( coilshotm). (seefigure4).Forcablewraporhighfillfacto rcoils,theeffectivedistanceofmagnetizati onis230 mm(9inches)oneithersideofthecoilcenter(s eefigure5).Forpartslongerthantheeeeffect ivedistances,theentirelengthshallbeinspe ctedbyrepositioningthepartwithinthecoil, ,thentheproductofthenumberofcoilturns,N, andthecurrentinamperesthroughthecoil,I,s hallbe.

6 \ (:10%)L/DwhereK=45,000ampereturnsL=lengt hofthePartD=diameterofthepart(measuredin thesameunitsasthelength) :NI=KR(~lo%)(6L/D)-5whereR=radiusoftheco ilin~(orininches) ~(43,000ampereturnsperinchifRismeasuredi ninches)L=thelengthofthepartD=thediamete rofthepart(measuredinthesameunitsasthele ngth) ,polepieces(piecesofferromagneticmateria lwiththesamediameterasthep artbeingtested) ,thevalue15 (includinghollowportions)ofthepartundert est,thenthe-productofthenumberofcoilturn s,N,andthecurrentinamperesthroughthecoil ,1,shallbe:NImK(L/D)+2(~lo%)whereK=35,00 0ampereturnsL=thelengthofthepartD=thedia meterofthepart(measuredinthesameunitsast helength) ,polepieces(piecesofferromagneticmateria lwiththesamediameterasthepartbeingtested ) ,thevalue15 ,theproductofthenumberofcoilturns,N,andt hecurrentthroughthecoil)Itshallbe:whereN I(NI(NI-r=(NI)h~+(NI) (Forexample,ifthecoilis10inchesindiamete randthepartisarod5inchesindiameterY=( )/(~. )=4.) ,DshallDereplacedwithaneffectivediameter ,Deff,calculatedusing:Deff=2[(At-Ah)/ #2whereAt=thetotalcrosssectionalareaofth epartAh=.)]

7 Eff-[(OD)2-(ID)2)1/2whereOD= , ( ) ~forexample, inspectionofpartsinareaswhere.,because ,andsimilargeometryto? ,slurries,orpaints, , ,andbeforethemagnetizingforceisremoved,e xcesspowdershallberemovedbymeansofadryai rcurrentwithsufficientforcetoremovetheex cessparticles, ,fuzzy,lightlyheldpowderpatternsformedby nearsurfacediscontinuities, (flighthardware) ,orslightlybefore, , ,suchastheuseofautomatedequipmentand\orf orcriticalparts,the1/2seconddurationand/ orthe2shotrequirementmaybewaivedprovided itisdemonstratedthatthetestprocedurecand etectknowndefectsinrepresentativetestpar ts( ). , , ~ , ,suchasboltholes, ,thelocationofallrejectableindicationssh allbemarkedonthepartandpermanentrecordso fthelocation, ~direction~ , ,thetape, ,cleaned,andcorrosionprotectedafterfinal magneticpurti ,andinnearlythesamedirectionas, ~asuggestedprocedureistoholdthepartabout 30cm(1ft)infrontofthecoilandthenmoveitsl owlyandsteadilythroughthecoilandatleast9 0cm(3ft) ,theinitialfieldshallbehigherthan~andinn earlythesamedirectionas,the ,decreasedinmagnitude,andtheprocessrepea ted(cycled) (3gauss)anywhereonthepart.]

8 ,airblower, ,crevices,passageways,etc., , ,materialsandthelightingenvironmentbeing used, ,ammetershunts,timers, ,location, , ,asappropriatetotheinspectionprocess, ,locationandfiizeneededfoLverification,a renotavailableorareimpractical,then, , , (Notrequiredforaerosolcansolutions) ~atregularintervalsthereafter, (ofthesizeandshapespecifiedinASTMD96, ). ( )addparticlesorsuspensionvehicle,asrequi red, , , , ,forfluorescentbaths, (forFluorescentbathsonly)andundervisible light(forbothfluorescentandnonfluorescen tbaths)forstriationsorbands, ,includingbandsorstriations,exceeds30%of thevolumeofmagneticparticles,oriftheliqu idisnoticeablyfluorescent, , , , , +1 Opercentoffullscalefromthecurrentvaluesh ownbythecalibratedammeter(whenmeasuringh alfwaverectifiedalternatingcurrent~thecu rrentvaluesshownbythecalibrateddirectcur rentammeterreadingshallbedoubled). ,thetimershouldbecheckedtowithin~ (whenallowed) (10pounds)witha50to100mm(2to4inch) (30 ~unds)witha50to100mm(2to4inch)spacingbet weenlegsor225N(50pounds)witha100to150mm( 4to6inch) ,partswhichhavebeenacceptedusingmagnetic particleinspectionshallbemarkedinaccorda ncewiththeapplicabledrawing,purchaseorde r, , , ,lasermarking, ,lasermarking~orvibroengravingshallbeuse dwhenpermittedorrequiredbytheapplicablew rittenprocedure~detailspecificationordra wing,orwhenthenatureofthepartissuchastop rovideforimpressionStampingofpartnumbers orotherinspector.

9 , ,vibroengravingoretchingisnotpermissible , ,shallbeusedforpartswhichhaveaconstructi onorfunctionprecludingtheuseofstamping,l asermarking~vibroengravingoretching,asin thecaseofcompletelygroundorpolishedballs ,rollers,pins, ,5,1lC) , ,adyeofacceptableadherencewhichispredomi natelyblue(perFED-STD-595) @r,ifacolorc onflictisincurredwithanyothermethod, ,lasermarking, ~lasermarking~vibroengravingoretchingisu sedtomark100-percentinspectedparts,thele tter M , , , ,lasermarking,vibroengravingoretchingisu sedtomarklot-inspectedparts,theletter ,inspectorsshallnotweareyeglassespermane ntlytintedorequippedwithlightrestrictive orlightsensitivelenses( ). ,AMS2301, , * , (wetordry)?oilvehicleswaterbaths,andwate rconditionerconcentratesaregovernedbythe suppliers MaterialSafetyDataSheets(MSDS).MaterialS afetyDataSheets, ,orequivalent, ,skincontact;andeyeexposurearedetailedin thesuppliers ~ , (Thissectioncontainsinformationofagenera lorexplanatorynaturethatmaybehelpful,but isnotmandatory.

10 ,orifalternatingcurrentorhalfwaverectifi edalternatingcurrentisbeingused, (keyword) :Army-MRNavy-ASAirForce-11 Reviewactivities:hrmy-AR,AV,EA,HINavy-SH AirForce-99,70,80,82,24,84 Useractivities:Army-Al ,AL,ME,TErARNavy-0 SAirForce-71 PreparingActivity:Army-MR-ProjectNDTI-01 27(WP#ID-0381 )22MI1,-:: I lLI M )A3 ti\4II1255 LFIGURE1., \1,HO*1234567891011124D, ~ooo(J5 KETOS toolsteelrincforuseinmagneticparticle ][arc)noasshallbeW-~SRockwell~ , ,ElfectiveRegionFigur~ ~\ ~li-f=tor~ ,, .EffectIonRegionOfInspection, -~cetmu?iste, * 1#-r[ o1n( ~ ( ) ( ) ( )+ ( )SectionA-A+* ( ) ( )(typ.)!I>A+* ( )SectionA-ADefectDivisionalline~ !B+( ) , , Note: = ,MagneticParticlehNAMCOPSUSMl~lNOOn*N$*T IONkAoDac* ).&LTVMOFOnOANIZATION(M-OIU)uVENOORqUSCn ]


Related search queries