1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN ISO 14744-2:2001 Th
2、e European Standard EN ISO 14744-2:2000 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 2: Measurement of accelerating voltage characteristicsThis British St
3、andard, having 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 34197 6 BS EN ISO 14744-2:2001 Amendments issued since publication Amd. No. Date Comments N
4、ational foreword This British Standard is the official English language version of EN ISO 14744-2:2000. It is identical with ISO 14744-2:2000. The UK participation in its preparation was entrusted to Technical Committee WEE/47, Miscellaneous welding standards, which has the responsibility to: aid en
5、quirers 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 related international and European developments and promulgate them in the UK. A list of organizations
6、 represented 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 Brit
7、ish Standards 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 pur
8、port to include 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
9、cover, the EN ISO title page, pages 2 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO147442 April2000 ICS25.160.00 Englishversion WeldingAcceptanceinspectionofelectronbeamweldi
10、ng machinesPart2:Measurementofacceleratingvoltage characteristics(ISO147442:2000) SoudageEssaisderceptiondesmachinesdesoudage parfaisceaudlectronsPartie2:Mesuredes caractristiquesdelatensiondacclration(ISO14744 2:2000) SchweienAbnahmeprfungvonElektronenstrahl SchweimaschinenTeil2:Messender Beschleun
11、igungsspannungsKenngren(ISO14744 2:2000) ThisEuropeanStandardwasapprovedbyCENon3January2000. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalrefere
12、ncesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSec
13、retariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION CO
14、MITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG CentralSecretariat:ruedeStassart,36B1050Brussels 2000CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO147442:2000EPage2 ENISO147442:2000 Contents Page Foreword. 3 1 Scope 4 2 Normativereference
15、s. 4 3 Termsanddefinitions 4 4 Testarrangement 4 4.1 General . 4 4 . 2 T e s t d e v i c e s 4 5 Measurementprocedure 6 5.1 General . 6 5 . 2 M e a s u r i n g t h e r i p p l e 7 5.3 Measuringthestability. 7 5.4 Measuringthereproducibility 7 6 Evaluation. 7Page3 ENISO147442:2000 Foreword ThetextofE
16、NISO147442:2000hasbeenpreparedbyTechnicalCommitteeCEN/TC121“Welding“,the secretariatofwhichisheldbyDS,incollaborationwithTechnicalCommitteeISO/TC44“Weldingandallied processes“. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelate
17、stbyOctober2000,andconflictingnationalstandardsshallbewithdrawnatthelatest byOctober2000. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsof thefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greec
18、e,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden, SwitzerlandandtheUnitedKingdom. ThisdraftEuropeanStandardiscomposedofthesixfollowingparts: Part1:Principlesandacceptanceconditions; Part2:Measurementofacceleratingvoltagecharacteristics; Part3:Measurementofbeamcurrentcharac
19、teristics; Part4:Measurementofweldingspeed; Part5:Measurementofrunoutaccuracy; Part6:Measurementofstabilityofspotposition.Page4 ENISO147442:2000 1Scope Thisstandardisintendedforusewhenthecharacteristicsoftheacceleratingvoltageofelectronbeamwelding machinescomplyingwithENISO147441istobemeasuredinconn
20、ectionwithanaceptanceinspection.Itprovides essentialinformationontheprocedureandapparatustobeusedformakingthemeasurements. Theacceleratingvoltageisoneofthesignificantparametersinelectronbeamwelding.Whenacceleratingthe electrons,thevoltageshouldbestableandreproduciblewithingivenshorttermandlongtermli
21、mits.Thepurpose ofthemeasurementisthustocheckwhetherthevariationsinacceleratingvoltagearewithinspecifiedlimits. 2Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetextandthepublica
22、tionsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). ENISO147441:2000 WeldingAcceptan
23、ceinspectionofelectronbeamweldingmachinesPart1:Principlesandacceptance conditions(ISO147441:2000) ENISO147443 WeldingAcceptanceinspectionofelectronbeamweldingmachinesPart3:Measurementofbeamcurrent caracteristics(ISO147443:2000) 3Termsanddefinitions ForthepurposesofthisEuropeanStandard,thefollowingte
24、rmanddefinitionapplies, 3.1 acceleratingvoltage differenceinelectricalpotentialbetweenthecathodeandanodeofthebeamgeneratorintheelectrongun. 4Testarrangement 4.1General Thevoltagesusuallypresentduringelectronbeamweldingattheoutputofthehighvoltagegenerator,attheend ofthehighvoltagecableandinthebeamgen
25、eratorcannotbesafelymeasuredwithouttheuseofspecial equipment. Since,generally,onlythemanufacturersofweldingmachinesorhighvoltageunitshaveappropriateequipmentat theirdisposal,ithasprovedexpedienttomeasuretheacceleratingvoltageatthemanufacturersworks. NOTEAttentionshouldbepaidtoelectricalsafetylevelsd
26、uringtestingathighvoltagesandtheneedfor appropriatelytrained/qualifiedpersonneltocarryouttests. Apartfromthesesafetyaspects,thetestequipmentshallalsobecapableofmeasuringtheacceleratingvoltageover theentirerangeofbeamcurrentsetting,i.e.withtheweldingparameterssettoconformtoactualweldingconditions. Th
27、emainpurposeofthefollowingdescriptionsandillustrationsoftestarrangementsistoenableuniform highvoltagemeasurementsonelectronbeamweldingmachinestobemaderatherthantoprovidecompletecircuit diagrams. 4.2Testdevices Avoltagedividershallbeconnectedbetweenthehighvoltageunitandtheelectrongun.Examplesareshown
28、in figures1and2. Theextenttowhichfrequencycompensationisrequireddependsonthetypeofhighvoltagegenerator. TheaccuracyoftestarrangementshallbecompatiblewiththerequirementsstatedinENISO147441.Page5 ENISO147442:2000 Key 1Highvoltagegenerator 2Biascontrolunit 3Cathodeheating 4Highvoltagecable1 5Highvoltag
29、ecable2 6Electronbeamgun 7Frequencycompensatedvoltagedivider10 4 :1, U Amax. =200kV, R=200M W 8 R=20k W measuringresistor 9Tooscilloscope,monitoredvoltage Figure1ExampleAofmeasurementofU A usingavoltagedivider Foradivisionratioof10 4 :1,forexample,anacceleratingvoltage, U a ,of150kVisreducedtoamonit
30、oredvoltage, U a ,of15V,whichmaybesuppliedtoanoscilloscope.Asthevoltagedividerisconnectedonlytooneofthe cathodeheatingconductors,acurrentof0,75mAflowstoearthforaresistanceof200M W andanaccelerating voltage, U a ,of150kV. Key 1Highvoltagegenerator 2Cathodeheatingandbiascontrolunit 3Highvoltagecable 4
31、Electronbeamgun 5Frequencycompensatedvoltagedivider10 4 :1, U Amax. =200kV, R=200M W 6 R=20k W measuringresistor 7Tooscilloscope,monitoredvoltage Figure2ExampleBofameasurementofU A usingavoltagedividerPage6 ENISO147442:2000 5Measurementprocedure 5.1General Themeasurementsshallbecarriedoutwiththeweld
32、ingmachinesetasspecifiedin6.2of ENISO147441:2000.Formeasuringtheacceleratingvoltagedeviationstheelectronbeamhavetobeswitched ontoo.Therefore,aworkpieceofsufficientsizeoraFaradaycupshallbeprovidedintheworkchamberas specifiedinENISO147443.Page7 ENISO147442:2000 5.2Measuringtheripple Anoscilloscopeshal
33、lbeusedtodeterminethemaximumrange(peaktopeakvalue)intheinstantaneousvalue U a ofthemonitoredvoltage, U a . Thepercentagedeviationshallbecalculatedasfollows: where U amax , U amin and U a aremaximum,minimumandaveragevaluesobservedduringtheperiodof observation. 5.3Measuringthestability Theaveragevolta
34、geshallberecordedcontinuouslyforagivenoperatingperiod,usinganinstrumenteliminating ripple. Thepercentagedeviationshallbecalculatedasfollows: whicheveristhelargestandwhere U amax and U amin aremaximumandminimumobservedvaluesand U a isthe initialvalue. 5.4Measuringthereproducibility Theacceleratingvol
35、tageshallbeswitchedonandtheaveragemonitoredvoltageshallbemeasured,usingan instrumenteliminatingripple. Theacceleratingvoltageandthespecifiedbeamcurrentshallsubsequentlybeswitchedoffandonseveral timesandthecorrespondingaveragemonitoredvoltagesshallberecorded. Thereproducibilityshallbecalculatedasfoll
36、ows: whicheveristhegreaterwhere U amax and U amin aremaximumandminimumaveragevaluesobservedand U a is theinitialvalue. 6Evaluation Themeasuredvaluesofripple,stabilityandreproducibilityshallbeassessedbycomparingthemwiththelimit deviationsspecifiedinENISO147441.BS EN ISO 14744-2:2001 BSI 389 Chiswick
37、High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards
38、Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standar
39、ds should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical
40、committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders fo
41、r all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. Standards are also available from the BSI website at http:/www.bsi-. In response to orders for international standards, it is BSI policy to supply the BSI imp
42、lementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic
43、information services are also available which give details on all its products and services. Contact the Information Centre. Tel: 020 8996 7111. Fax: 020 8996 7048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of s
44、tandards. For details of these and other benefits contact Membership Administration. Tel: 020 8996 7002. Fax: 020 8996 7001. Further information about BSI is available on the BSI website at http:/www.bsi-. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK,
45、 of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the
