1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN ISO 14744-6:2001 Th
2、e European Standard EN ISO 14744-6:2000 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 6: Measurement of stability of spot positionThis British Standard, ha
3、ving been prepared 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 34195 X BS EN ISO 14744-6:2001 Amendments issued since publication Amd. No. Date Comments National fo
4、reword This British Standard is the official English language version of EN ISO 14744-6:2000. It is identical with ISO 14744-6:2000. The UK participation in its preparation was entrusted to Technical Committee WEE/47, Miscellaneous welding standards, which has the responsibility to: aid enquirers to
5、 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 related international and European developments and promulgate them in the UK. A list of organizations represent
6、ed on this committee 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 Standa
7、rds which implement 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 in
8、clude all the 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
9、 EN ISO title page, pages 2 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO147446 April2000 ICS25.160.00 Englishversion WeldingAcceptanceinspectionofelectronbeamwelding machine
10、sPart6:Measurementofstabilityofspotposition(ISO 147446:2000) SoudageEssaisderceptiondesmachinesdesoudage parfaisceaudlectronsPartie6:Mesuredelastabilitde lapositiondelatachefocale(ISO147446:2000) SchweienAbnahmeprfungvonElektronenstrahl SchweimaschinenTeil6:MessenderFlecklagekonstanz (ISO147446:2000
11、) ThisEuropeanStandardwasapprovedbyCENon3January2000. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsma
12、ybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial
13、versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKO
14、MITEEFRNORMUNG CentralSecretariat:ruedeStassart,36B1050Brussels 2000CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO147446:2000EPage2 ENISO147446:2000 Contents Page Foreword. 3 1 Scope 4 2 Normativereferences. 4 3 Termsanddefinitions 4 4 Testarra
15、ngement 4 4.1 General . 4 4.2 Workpiecepreparation. 5 5 Measurementprocedure 5 5.1 Weldingmachinewithopticalviewingsystem 5 5.2 Weldingmachinewithoutopticalviewingsystem 8 6 Evaluation. 9Page3 ENISO147446:2000 Foreword ThetextofENISO147446:2000hasbeenpreparedbyTechnicalCommitteeCEN/TC121“Welding“,th
16、e secretariatofwhichisheldbyDS,incollaborationwithTechnicalCommitteeISO/TC44“Weldingandallied processes“. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyOctober2000,andconflictingnationalstandardsshallbewithdrawnatthelat
17、est byOctober2000. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsof thefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sw
18、eden, SwitzerlandandtheUnitedKingdom. ThisdraftEuropeanStandardiscomposedofthesixfollowingparts: Part1:Principlesandacceptanceconditions; Part2:Measurementofacceleratingvoltagecharacteristics; Part3:Measurementofbeamcurrentcharacteristics; Part4:Measurementofweldingspeed; Part5:Measurementofrunoutac
19、curacy; Part6:Measurementofstabilityofspotposition.Page4 ENISO147446:2000 1Scope Thisstandardisintendedforusewhenthestabilityofspotstabilityofweldingmachinescomplyingwith ENISO147441istobemeasuredinconnectionwithanacceptanceinspection.Itprovidesessentialinformation totheprocedureandapparatustobeused
20、formakingthemeasurements. Thestabilityofthespotpositionisaparticularlysignificantparameterforprolongedweldingapplicationsandfor electronbeamweldingwithautomaticdevicespositioningtheworkpiece.Insuchapplications,theweldingmachine shallbeabletoreproduce,overprolongedperiodsandwithoutadditionalcorrectio
21、nofthepositionbeingrequired, agivenbeamtojointalignment.Thepurposeofmeasurementistocheckwhetherandtowhatextenttheelectron beamgeneratedbyaweldingmachinekeepswithintherangeoflimitdeviationsspecifiedforthespotposition. 2Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,prov
22、isionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferences
23、thelatesteditionofthe publicationreferredtoapplies(includingamendments). ENISO147441:2000 WeldingAcceptanceinspectionofelectronbeamweldingmachinesPart1:Principlesandacceptance conditions(ISO147441:2000) ENISO147443 WeldingAcceptanceinspectionofelectronbeamweldingmachinesPart3:Measurementofbeamcurren
24、t (ISO147443:2000) ISO1302 TechnicaldrawingsMethodofindicatingsurfacetexture 3Termsanddefinitions ForthepurposesofthisEuropeanStandard,thefollowingtermanddefinitionapplies, 3.1 Spotposition geometricalpositionoftheelectronbeamwhenitimpingesontheworkpiecesurface(weldpoint)withrespecttoa systemofcoord
25、inatesperpendiculartotheaxisofthebeam. 4Testarrangement 4.1General Duringthespecifiedtestperiod,theelectronbeam,atagivenpower,transmitsitsenergytoaheatsinkAortoa FaradaycupasdescribedinENISO147443(seefigure1).Fortheactualmeasurement,aspeciallyprepared workpiece,B,shallbepositionedinthebeamaxisandthe
26、beampoweradjustedtotheweldingtask(smallmelt spotsormeltruns). Thebeamfocaldistanceemployedshallbethemaximumpracticalintheworkchamber. TheheatsinkortheFaradaycupandtheworkpieceBshallbearrangedrelativetoeachothersoastopreventany thermalinteraction. Todeterminethebeamcurrentrequiredforthemeasurement,as
27、isnormalinweldingpractice,athirdworkpiece,C, ofthesameheightasworkpieceBshallbeprovided(seefigure1). Toavoidbeamdeflection,theworkpiecesanddevicesusedshallbemadeofnonmagnetizablematerials.Page5 ENISO147446:2000 Key 1HeatsinkorFaradaycup 2Screen(topreventpossible thermalinteraction) 3WorkpieceBwithco
28、ordinateaxis, fixedtotheworktable 4WorkpieceC 5Worktable Figure1Testarrangementformeasuringthestabilityofspotposition 4.2Workpiecepreparation ThesurfaceofworkpieceBintendedtobemeasuredshallhavearoughnessvalue, Ra,equalto1,6masspecified inISO1302. 5Measurementprocedure 5.1Weldingmachinewithopticalvie
29、wingsystem 5.1.1General Themeasurementshallbecarriedoutwiththeweldingmachinesetasspecifiedin6.5ofENISO147441:2000.No modifications,particularlynoadjustments,shallbemadetotheweldingmachinebetweenthestepsdescribedinthe followingsubclauses. 5.1.2WeldingmachinewithaCNCworktable Measurementsshallbecarrie
30、doutinthefollowingway: 1)beforestartingthemeasurements,thesettingsnecessarytoobtainasmallmeltspotshallbedetermined fortheselectedfocaldistanceonworkpieceC,seefigure1; 2)thenthefirstspotP 1 shallbemeltedonworkpieceBbyprogrammingintheCNCposition: x 1 =0,000mm; y 1 =0,000mm; 3)ThenextspotsP 2 andP 3 sh
31、allbemeltedatthecoordinates: x 2 =5,000mm; y 2 =0,000mm;and x 3 =0,000mm; y 3 =5,000mm;seefigure2.Page6 ENISO147446:2000 Figure2SpotweldsarrangementwithCNCworktable ToavoidbacklashitisimportanttomovetheworktableonlyinthesameXorYdirectiontoreachthe ( )positions. 4)heatsinkAorFaradaycupshallbeposition
32、edinthebeamaxis.Theweldingmachineshallbeswitched on,interruptedandbesetandmaintainedatthepowerandoperatingtimespecifiedinENISO147441:2000 in6.5; 5)workpieceBshallbepositionedwithtablecoordinates: x 4 =5,000mm; y 4 =5,000mm; andthefourthspotshallbemelted. 6)usingthereferencespotsP 1 ,P 2 andP 3 workp
33、ieceBshallbepositionedintheXandYdirectionofa workshoptravellingmicroscope.Thecoordinatesx 4 andy 4 ofthespotcenterP 4 shallbemeasured. Thedeviationfromthecorrectpositionx 4 ,y 4 shallbecalculatedasfollows: where D x=x 4 -x 4 D y=y 4 -y 4 Ifafocaldistanceotherthan300mmhasbeenusedformeltingthespots,th
34、evalue D rthusobtainedshall beconvertedproportionallyon D rtoA F =300mm. 5.1.3WeldingmachinewithoutaCNCworktable 5.1.3.1WorkpieceB Usingamarkingtoolandasetsquarerule,engraveasystemofaxes(Y,X A andX B )onthesurfaceofworkpieceB asshowninfigure3,insuchawaythatvaluescanbereadtoanaccuracyof0,02mmunderawo
35、rkshop travellingmicroscope.Page7 ENISO147446:2000 Figure3CoordinateaxesonworkpieceB 5.1.3.2Measurements Measurementsshallbecarriedoutinthefollowingway: 1)beforestartingthemeasurements,thesettingsnecessarytoobtainasmallmeltspotshallbedetermined fortheselectedfocaldistanceonworkpieceC,seefigure1.Itsh
36、allbeensuredbyaslightadjustmentthat themeltspotisnotatthecentreofthecoordinatesystemviewedthroughtheviewingsystem; 2)then,workpieceB,havingthesamefocaldistanceasworkpieceC,shallbepositionedundertheoptical viewingsystemsothataxesYandX A coincidewithaxesYandXoftheviewingsystem(seefigure4). Followingth
37、at,spotP A shallbemelted,usingthevaluespreviouslydetermined(seefigure4); Figure4Axesasseenthroughopticalviewingsystem 3)heatsinkAortheFaradaycup,asappropriate,shallbepositionedonthebeamaxis.Theweldingmachine shallbeswitchedon,interruptedandbesetandmaintainedatthepowerandoperatingtimespecifiedin ENIS
38、O147441; 4)workpieceBshallbepositionedundertheopticalviewingsystemsothataxesYandX B coincidewithaxes YandXoftheviewingsystem(seefigure5).Followingthat,spotP B shallbemelted,usingthesame settings,seefigure5; Figure5MeltspotsasseenthroughopticalviewingsystemPage8 ENISO147446:2000 5)usingaworkshoptrave
39、llingmicroscope,distancesx 1 andy 1 aswellasx 2 andy 2 ofweldspotsP A andP B shallbemeasured,seefigure6.Thestabilityofthespotpositionsshallbecalculatedfromdistancesx 1 and x 2 fortheXaxisanddistancesy 1 andy 2 fortheYaxis. where D x=x 1 -x 2 D y=y 1 -y 2 Ifafocaldistanceotherthan300mmhasbeenusedform
40、eltingthespots,thevalue D rthusobtainedshall beconvertedproportionallyon D rtoA F =300mm. Figure6MeltspotsonworkpieceB 5.2Weldingmachinewithoutopticalviewingsystem 5.2.1General Onlygeneralinformationonthemeasurementprocedurecanbegiven,sincetheproceduredepends,toalarge extent,onthestructureandthemode
41、ofoperationoftheweldingmachine. 5.2.2Initialandendpositionsoffocalspot Insteadofmeltingspots,beforeandaftercontinuousoperationofthemachine,concentriccircularmeltrunsshall bemadeonworkpieceBbymovingthebeamaroundinacircularpath,seefigure7. RunR A shallbemadepriorto,andrunR B aftercontinuousoperation,t
42、heradiusofthelatterbeingchangedsothat intheeventofadisplacementofthefocalspot,thetworunswillnotoverlapandthuspreventcorrectmeasurement. Themachinesettingsfortherunsshallbedeterminedseparatelyusingathirdworkpiece,C,whilstthewelding parametersforcontinuousoperationarespecifiedinENISO147441. Forthispur
43、pose,itisassumedthattheweldingmachineisequippedwithdevicespermittingautomaticpositioning oftheworkpieceinrelationtothebeamaxiswithoutanopticalviewingsystembeingrequired.Thepositioning accuracyofthesedevicesshall,wherenecessary,betestedseparately. Figure7WorkpieceBwithcircularmeltrunsPage9 ENISO147446:2000 5.2.3Measuringthestabilityofspotposition Distancesx 1 ,x 2 ,y 1 andy 2 onthefourcoordinateaxesshallbemeasuredusingaworkshoptravellingmicroscope, seefigure7.
