1、BRITISH STANDARD BS EN 12680-2:2003 Founding Ultrasonic examination Part 2: Steel castings for highly stressed components The European Standard EN 12680-2:2003 has the status of a British Standard ICS 77.040.20 BS EN 12680-2:2003 This British Standard was published under the authority of the Standar
2、ds Policy and Strategy Committee on 5 February 2003 BSI 5 February 2003 ISBN 0 580 41199 0 National foreword This British Standard is the official English language version of EN 12680-2:2003. The UK participation in its preparation was entrusted to Technical Committee ISE/NFE/9, Foundry technology,
3、which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the s
4、ection entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application
5、. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor
6、related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 35 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issu
7、ed. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN126802 January2003 ICS77.040.20 Englishversion FoundingUltrasonicexaminationPart2:Steelcastingsfor highlystressedcomponents FonderieContrleparultrasonsPartie2:Pices moulesenacierpourcomposa
8、ntsfortementsollicits GieereiwesenUltraschallprfungTeil2: StahlgussstckefrhochbeanspruchteBauteile ThisEuropeanStandardwasapprovedbyCENon21November2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstanda
9、rdwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibili
10、tyofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,S
11、pain,Sweden,SwitzerlandandUn ited Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN126802:2003EEN1
12、26802:2003(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Termsanddefinitions. .4 4 Requirements .5 4.1 Orderinformation . .5 4.2 Extentofexamination. .6 4.3 Maximumpermissiblesizeofdiscontinuities. 6 4.4 Personnelqualification . 6 4.5 Wallsectionzones .6 4.6 Severitylevels . .7 5
13、Examination7 5.1 Principles7 5.2 Material7 5.3 Equipment,couplingmedium,sensitivityandresolutionofdetection .8 5.4 Preparationofcastingsurfacesfortesting . .8 5.5 Examinationprocedure . 9 5.6 Examinationreport 12 AnnexA (normative) Resolutionofdetectionoftheinstrument/probecombination.20 AnnexB (inf
14、ormative) Soundbeamdiameters .21 AnnexC (informative) Typesofindications 23 Bibliography 35EN126802:2003(E) 3 Foreword Thisdocument(EN126802:2003)hasbeenpreparedbyTechnicalCommitteeCEN/TC190“FoundryTechnol ogy“,thesecretariatofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhestatusofanationalsta
15、ndard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyJuly2003,andconflictingnationalstandardsshallbewithdrawnatthelatestby July2003. Withinitsprogrammeofwork,TechnicalCommitteeCEN/TC190requestedCEN/TC190/WG4.10“Innerdefects“ topreparethefollowingstandard: EN126802, FoundingUltraso
16、nicexaminationPart2:Steelcastingsforhighlystressedcomponents. ThisisoneofthreeEuropeanStandardsforultrasonicexamination.Theotherstandardsare: EN126801, FoundingUltrasonicexaminationPart1:Steelcastingsforgeneralpurposes. EN126803, FoundingUltrasonicexaminationPart3:Spheroidalgraphitecastironcastings.
17、 AnnexAisnormative.AnnexesBandCareinformative. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowingcoun triesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Net
18、herlands,Norway,Portugal,Spain,Swe den,SwitzerlandandtheUnitedKingdom.EN126802:2003(E) 4 1Scope ThisEuropeanStandardspecifiestherequirementsfortheultrasonicexaminationofsteelcastings(withferritic structure)forhighlystressedcomponentsandthemethodsfordetermininginternaldiscontinuitiesbythepulse echote
19、chnique. ThisEuropeanStandardappliestotheultrasonicexaminationofsteelcastingswhichhaveusuallyreceivedagrain refiningheattreatmentandwhichhavewallthicknessesuptoandincluding600mm. Forgreaterwallthicknesses,specialagreementsapplywithrespecttotestprocedureandrecordinglevels. ThisEuropeanStandarddoesnot
20、applytoausteniticsteelsandjointwelds. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevi
21、sionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN5831, NondestructivetestingUltrasonicexaminationPart1:Generalprinciples. EN5832, Nondestructivetesting
22、UltrasonicexaminationPart2:Sensitivityandrangesetting. EN5835:2000, NondestructivetestingUltrasonicexaminationPart5:Characterizationandsizingofdiscon tinuities. EN12223, NondestructivetestingUltrasonicexaminationSpecificationforcalibrationblockNo.1. EN126681, NondestructivetestingCharacterizationand
23、verificationofultrasonicexaminationequipment Part1:Instruments. EN126682, NondestructivetestingCharacterizationandverificationofultrasonicexaminationequipment Part2:Probes. EN126683, NondestructivetestingCharacterizationandverificationofultrasonicexaminationequipment Part3:Combinedequipment. EN27963
24、, WeldsinsteelCalibrationblockNo.2forultrasonicexaminationofwelds(ISO7963:1985). 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thefollowingtermsanddefinitionsapply. NOTE OthertermsanddefinitionsusedinthisEuropeanStandardaregiveninEN5831,EN5832,EN5835and EN13304. 3.1 referencediscontinui
25、tyechosize smallestindicationtoberecordedduringtheassessmentphaseofanultrasonicexamination,usuallyexpressedas anequivalentflatbottomedholediameter 3.2 pointdiscontinuity discontinuity,thedimensionsofwhicharesmallerthanorequaltothesoundbeamdiameterEN126802:2003(E) 5 NOTE Dimensionsinthisstandardrelat
26、etolength,widthand/ordimensioninthroughwalldirection. 3.3 complexdiscontinuity discontinuity,thedimensionsofwhicharelargerthanthesoundbeamdiameter NOTE Dimensionsinthisstandardrelatetolength,widthand/ordimensioninthroughwalldirection. 3.4 planardiscontinuity discontinuityhavingtwomeasurabledimension
27、s 3.5 volumetricdiscontinuity discontinuityhavingthreemeasurabledimensions 3.6 specialrimzone outerrimzonepartwithspecialrequirements(fore.g.machinedsurfaces,higherstresses,sealingsurfaces) 3.7 productionwelding anyweldingcarriedoutduringmanufacturingbeforefinaldeliverytothepurchaser 3.7.1 jointweld
28、ing productionweldingusedtoassemblecomponentstogethertoobtainanintegralunit 3.7.2 finishingwelding productionweldingcarriedoutinordertoensuretheagreedqualityofthecasting 4Requirements 4.1 Orderinformation Thefollowinginformationshallbeavailableatthetimeofenquiryandorder(seealsoEN5831): theareasofthe
29、castingandthenumberorpercentageofcastingstowhichtheultrasonicexaminationrequire mentsapply; theseverityleveltobeappliedtothevariouszonesorareasofthecasting; requirementsforawrittenexaminationprocedure; whetherthereareanyadditionalrequirementsfortheexaminationprocedure,seealso5.5.1.EN126802:2003(E) 6
30、 4.2 Extentofexamination Thecastingshallbeexaminedsothattheagreedareasaretotallycovered(insofarasthisispossiblefromthe shapeofthecasting)bytheuseofthebestapplicableexaminationtechnique. Forwallthicknessesgreaterthan600mm,agreementshallbemadebetweenthepartiesconcernedonthetest procedureandalsoonthere
31、cordingandacceptancelevels. 4.3 Maximumpermissiblesizeofdiscontinuities 4.3.1General Thepurchasershallspecifytheacceptancelevelaccordingtotherequiredseveritylevelforplanarandvolumetric discontinuitieswithineachzoneandineachspecifiedareaofthecasting. ThewallsectionshallbedividedintozonesasshowninFigu
32、re1.Thesesectionsrelatetothesizesofcastings readyforassembly(finishmachined). 4.3.2 Indicationswithoutmeasurabledimensions Inspecialrimzonesandatweldpreparationends,indicationswithoutmeasurabledimensionsarelimitedtoa maximumnumberofindications. TheseindicationsshallnotexceedthelimitsgiveninTable1. 4
33、.3.3 Indicationswithmeasurabledimensions 4.3.3.1 Planardiscontinuities PlanardiscontinuitiesshallnotexceedthelimitsgiveninFigure2. Theareaofindicationwithmeasurablelengthbutwithnonmeasurabledimensioninthroughwalldirectionshallbe calculatedaccordingtotheformulagiveninFigure2. Thesizingofsmallplanardi
34、scontinuities,asgiveninFigure2,becomesmoredifficultwithincreasingbeampath lengthandsoundbeamdiameter.Asaguide,thesesizingsarenormallyappliedtoarimzoneof30mm.Itmakes theuseofprobeswithfocussedbeamssuchastwincrystalprobesnecessary. 4.3.3.2 Volumetricdiscontinuities Volumetricdiscontinuitiesshallnotexc
35、eedthesizesgiveninFigure3forrimzoneandFigure4forcorezone.Indi cationswithmeasurabledimensionsarenotpermissibleinseveritylevel1.Theareaofanindicationwithmeasur ablelengthbutnonmeasurablewidthshallbecalculatedinaccordancewiththeformulagiveninFigures3and4. 4.4Personnel qualification Itisassumedthatultr
36、asonicexaminationisperformedbyqualifiedandcapablepersonnel.Inordertoprovethis qualification,itisrecommendedtocertifypersonnelinaccordancewithEN473. 4.5 Wallsectionzones ThewallsectionshallbedividedintozonesasshowninFigure1.Thesesectionsrelatetothedimensionsofthe castingreadyforassembly(finishmachine
37、d).EN126802:2003(E) 7 4.6 Severitylevels Ifthepurchaserspecifiesdifferentseveritylevelsindifferentareasofthesamecasting,alloftheseareasshallbe clearlyidentifiedonthepurchasersdrawingandshallinclude: allnecessarydimensionsforaccuratelocationofzones; thefullextentofallweldpreparationsandthethicknessof
38、anyspecialrimzone. Severitylevel1isonlyappliedtoweldpreparationsandspecialrimzones. Unlessotherrequirementshavebeenagreedbythetimeofacceptanceoftheorder,forfinishingwelds,there quirementsfortheparentmetalshallapply. 5Examination 5.1Principles TheprinciplesofultrasonicexaminationgiveninEN5831,EN5832a
39、ndEN5835shallapply. 5.2Material Thesuitabilityofmaterialforultrasonicexaminationisassessedbycomparisonwiththeechoheightofareference reflector(usuallythefirstbackwallecho)andthenoisesignal.Thisassessmentshallbecarriedoutonselected castingareaswhicharerepresentativeofthesurfacefinishandofthetotalthick
40、nessrange.Theassessmentareas shallhaveparallelsurfaces. ThereferenceechoheightaccordingtoTable2shallbeatleast6dBabovethenoisesignal. Iftheechoheightofthissmallestdetectableflatbottomedorequivalentsidedrilledholediameterattheendofthe testrangetobeassessedislessthan6dBabovethegrasslevel,thentheultraso
41、nictestabilityisreduced.Inthis case,theflatbottomedorsidedrilledholediameterwhichcanbedetectedwithasignalnoiseratioofatleast6dB shallbenotedinthetestreportandtheadditionalprocedureshallbeagreedbetweenthemanufacturerandthe purchaser. NOTE Forthedefinitionofanadequateflatbottomedholesize,thedistancega
42、insizesystem(DGS)oratestblockof identicalmaterial,heattreatmentconditionandsectionthicknesscontainingflatbottomedholeswithadiameteraccordingto Table2orequivalentsidedrilledholes,canbeused.Thefollowingformulaisusedforconvertingtheflatbottomedholedi ameterintothesidedrilledholediameter: s D D = 2 FBH
43、Q l 4 935 , 4 (1) where D Q isthesidedrilledholediameterinmillimetres; D FBH istheflatbottomedholediameterinmillimetres; l isthewavelengthinmillimetres; s isthepathlengthinmillimetres. Theformulaisapplicablefor D Q 2 l and s 5 nearfieldlengthandisonlydefinedforsingleelementprobes.EN126802:2003(E) 8 5.3 Equipment,couplingmedium,sensitivityandresolutionofdetection 5.3.1 Ultrasonicinstrument TheultrasonicinstrumentshallmeettherequirementsgiveninEN126681andshallhavethef
