1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN ISO 14744-4:2001 Th
2、e European Standard EN ISO 14744-4:2000 has the status of a British Standard ICS 25.160.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Welding Acceptance inspection of electron beam welding machines Part 4: Measurement of welding speedThis British Standard, having been pre
3、pared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 April 2001 BSI 04-2001 ISBN 0 580 34193 3 BS EN ISO 14744-4:2001 Amendments issued since publication Amd. No. Date Comments National foreword This B
4、ritish Standard is the official English language version of EN ISO 14744-4:2000. It is identical with ISO 14744-4:2000. The UK participation in its preparation was entrusted to Technical Committee WEE/47, Miscellaneous welding standards, which has the responsibility to: aid enquirers to understand t
5、he text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this co
6、mmittee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which imp
7、lement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the
8、 necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title pag
9、e, pages 2 to 6, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO147444 April2000 ICS25.160.00 Englishversion WeldingAcceptanceinspectionofelectronbeamwelding ma
10、chinesPart4:Measurementofweldingspeed(ISO14744 4:2000) SoudageEssaisderceptiondesmachinesdesoudage parfaisceaudlectronsPartie4:Mesuredelavitessede soudage(ISO147444:2000) SchweienAbnahmeprfungvonElektronenstrahl SchweimaschinenTeil4:Messender Schweigeschwindigkeit(ISO147444:2000) ThisEuropeanStandar
11、dwasapprovedbyCENon3January2000. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicat
12、iontotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersa
13、rethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG Centra
14、lSecretariat:ruedeStassart,36B1050Brussels 2000CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO147444:2000EPage2 ENISO147444:2000 Contents Page Foreword. 3 1 Scope 4 2 Normativereferences. 4 3 Testarrangement 4 3.1 Electricaltestarrangement 4 3.2
15、 Mechanicaltestarrangement 5 4 Measurementprocedure 5 4.1 General . 5 4 . 2 R o t a t i o n d e v i c e 5 4.3 Measuringtheshorttermstability. 6 4.4 Measuringthelongtermstability. 6 4.5 Measuringthereproducibility 6 5 Evaluation. 6Page3 ENISO147444:2000 Foreword ThetextofENISO147443:2000hasbeenprepar
16、edbyTechnicalCommitteeCEN/TC121“Welding“,the secretariatofwhichisheldbyDS,incollaborationwithTechnicalCommitteeISO/TC44“Weldingandallied processes“. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyOctober2000,andconflicti
17、ngnationalstandardsshallbewithdrawnatthelatest byOctober2000. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsof thefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxe
18、mbourg,Netherlands,Norway,Portugal,Spain,Sweden, SwitzerlandandtheUnitedKingdom. ThisdraftEuropeanStandardiscomposedofthesixfollowingparts: Part1:Principlesandacceptanceconditions; Part2:Measurementofacceleratingvoltagecharacteristics; Part3:Measurementofbeamcurrentcharacteristics; Part4:Measurement
19、ofweldingspeed; Part5:Measurementofrunoutaccuracy; Part6:Measurementofstabilityofspotposition.Page4 ENISO147444:2000 1Scope Thisstandardisintendedforusewhentheweldingspeedforelectronbeamweldingmachinescomplyingwith ENISO147441istobemeasuredinconnectionwithanacceptanceinspection.Itprovidesessentialin
20、formation ontheprocedureandapparatustobeusedformakingthemeasurements. Alternativestandardisedprocedurescanbeused,providedtheyhaveatleastthesameacceptanceinspectionas theweldsspecifiedinthispart4.Themeasuredparameteristhespeedofthetranslationalandrotational movementsrequiredtoperformtheweldingoperati
21、on. Theweldingspeedisoneofthesignificantparametersinelectronbeamwelding.Theworkpieceortheweldpoint shallthusbemovedatauniformspeed,inareproduciblemanner,withingivenshorttermandlongtermlimits.The purposeofthemeasurementistocheckwhetherthevariationsinweldingspeedaremaintainedwithintheselimits. 2Normat
22、ivereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropea
23、n Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). ENISO147441:2000 WeldingAcceptanceinspectionofelectronbeamweldingmachinesPart1:Principlesanda c c e p t a n c e conditions(ISO147441:2000) 3Testarrange
24、ment 3.1Electricaltestarrangement Totakeaccountofallinterferencesaffectingtheweldingspeed,themeasurementshallbemadedirectlyonthe workpieceoronthedevicepositioningtheworkpieceoronamovableelectrongun,ifappropriate.Suitable transducers,withalinearresponse,maybeusedtotransmitthetranslationalorrotational
25、movement,e.g.rotary transducers,viaahardrubberfrictionwheel(seefigures1and2). Buildinencodersorresolversmayalsobeused,ifdirectlyconnectedtothemovingdevices. Surfaceroughnessinm. Key 1Worktable 2Contactstrip 3Rotarytransducerfixedtononmovingpart Figure1Exampleofarrangementformeasuringthespeedoftransl
26、ationalmovementsPage5 ENISO147444:2000 Surfaceroughnessinm Key 1Rotatingdevice 2Rotarytransducer 3Flexiblemetalanglefixedtononmovingpart 4Contactring Figure2Exampleofarrangementformeasuringthespeedofrotationalmovements 3.2Mechanicaltestarrangement Aspecialsupporthastobeusedtoeffectmechanicalcontactb
27、etweentransducerandthedevicepositioningthe workpiece. Forgreateraccuracyofmeasurement,thisspecialsupporthastofulfillthefollowingrequirements: a)itshallkeepthetransducerfirmlyinplacewithminimumvibration,e.g.ontheworktablesupporting structureorontheworkchamber.Insomecases,multiaxialsupportofthetransdu
28、cermightbenecessary; b)itshallallowforacertainyieldinthecontactbetweenfrictionwheelandcontactsurface,e.g.bymeansof aresilientmetalangle(seefigure2).Anyslipoccurringisatonceevidentinthemeasurementandcanbe compensatedforbyslightlyincreasingthepressureapplication. Rotarytransducersmayalsobeusedforspeed
29、measurementsundervacuum.Relevantinformationmaybe obtainedfromthemanufacturerofthetransducer.Forsuchmeasurement,afeedthroughtoaccommodatea multicorecableisrequiredforconnectingthetransducerandthefrequencyvoltageconverter. 4Measurementprocedure 4.1General Themeasurementsshallbecarriedoutwiththewelding
30、machinesetasspecifiedin6.3of ENISO147441:2000. Unlessotherwisespecifiedthemeasurementsmaybecarriedoutwiththechambervented. 4.2Rotationdevice Incaseofrotationalmovements,measurementsshallbemadeatthemaximumandminimumrevolutionofthe rotationdevicecalculatedasfollows:Page6 ENISO147444:2000 4.3Measuringt
31、heshorttermstability Anoscilloscopeshallbeusedtodeterminethemaximumrange(peaktopeakvalue)intheinstantaneousvalue U v ofthemonitoredvoltage, U v . Thepercentagedeviationshallbecalculatedasfollows: where U vmax , U vmin and U v aremaximum,minimumandaveragevaluesobservedduringtheperiodof observation. 4
32、.4Measuringthelongtermstability Theaveragevoltageshallberecordedcontinuouslyforagivenoperatingperiod,usinganinstrumenteliminating ripple. Thepercentagedeviationshallbecalculatedasfollows: whicheveristhelargestandwhere U vmax and U vmin aremaximumandminimumobservedvaluesand U v isthe initialvalue. 4.
33、5Measuringthereproducibility Thepositioningdevicesshallbeswitchedonandtheaveragemonitoredvoltageshallbemeasured,usingan instrumenteliminatingripple. Thepositioningdevicesshallsubsequentlybeswitchedoffandonseveraltimesandthecorrespondingaverage monitoredvoltagesshallberecorded. Thereproducibilityshal
34、lbecalculatedasfollows: whicheveristhegreaterwhere U vmax and U vmin aremaximumandminimumaveragevaluesobservedand U v is theinitialvalue. 5Evaluation Themeasuredvaluesofshorttermandlongtermstabilityandthereproducibilitylimitsshallbeassessedby comparingthemwiththelimitdeviationsspecifiedinENISO147441
35、.BS EN ISO 14744-4:2001 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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