1、BRITISH STANDARD BS EN ISO 17642-1:2004 Destructive tests on welds in metallic materials Cold cracking tests for weldments Arc welding processes Part 1: General The European Standard EN ISO 17642-1:2004 has the status of a British Standard ICS 25.160.40 BS EN ISO 17642-1:2004 This British Standard w
2、as published under the authority of the Standards Policy and Strategy Committee on 11 August 2004 BSI 11 August 2004 ISBN 0 580 44251 9 National foreword This British Standard is the official English language version of EN ISO 17642-1:2004. It is identical with ISO 17642-1:2004. The UK participation
3、 in its preparation was entrusted to Technical Committee WEE/2, Welding tests, 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 publicat
4、ions referred to in this document may be found in the BSI Catalogue under the section 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 necess
5、ary provisions of a contract. Users are responsible for its correct application. 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 interp
6、retation, or proposals for change, and keep the UK interests informed; monitor 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 ISO title page, pages 2 to 5 and a back cover. The BSI c
7、opyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO176421 August2004 ICS25.160.40 Englishversion DestructivetestsonweldsinmetallicmaterialsColdcracking t
8、estsforweldmentsArcweldingprocessesPart1:General (ISO176421:2004) Essaisdestructifsdessouduressurmatriauxmtalliques Essaisdefissurationfroiddesassemblagessouds ProcdsdesoudagelarcPartie1:Gnralits(ISO 176421:2004) ZerstrendePrfungvonSchweiverbindungenan metallischenWerkstoffenKaltrissprfungenfr Schwe
9、iungenLichtbogenschweiprozesseTeil1: Allgemeines(ISO176421:2004) ThisEuropeanStandardwasapprovedbyCENon9February2004. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelist
10、sandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguagea
11、ndnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, S
12、lovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.
13、ENISO176421:2004:EENISO176421:2004(E) 2 Contents page Foreword. 3 1 Scope . 4 2 Normativereferences . 4 3 Termsanddefinitions. 4 4 Fundamentals 5ENISO176421:2004(E) 3 Foreword Thisdocument(ENISO176421:2004)hasbeenpreparedbyTechnicalCommitteeCEN/TC121“Welding”, thesecretariatofwhichisheldbyDIN,incoll
14、aborationwithTechnicalCommitteeISO/TC44“Weldingand alliedprocesses”. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentical textorbyendorsement,atthelatestbyFebruary 2005,andconflict ingnationalst andardsshallbewithdrawn atthelatestbyFebruary 2005 . ENISO17642c
15、onsistsofthefollowingparts,underthegeneraltitle Destructivetestsonweldsinmetallic materialsColdcrackingtestsforweldmentsArcweldingprocesses : Part1:General Part2:Selfrestrainttests Part3:Externallyloadedtests AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowin
16、g countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Cyprus,CzechRepublic, Denmark,Estonia,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania, Luxembourg,Malta,Netherlands,Norway,Poland,Portugal,Slovakia,Slovenia,Spain,Sweden,Switzerland andUnitedKingdom.ENISO
17、176421:2004(E) 4 1Scope Thisstandarddescribesthefundamentalsofcoldcrackformationandtheprinciplesofcoldcrackingtests. Thesetestscanbeusedtodeterminethecoldcrackingsensitivityofweldingconsumables,parentmaterials, weldmetal.Themostcommontestsaredescribed(afterreferredtohydrogencracking). Inaddition,ano
18、verviewisgivenofthecoldcrackingtestprocedures,theirclassification,andtheirfieldsof applicationarewithinENISO176422andENISO176423. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications. Thesenormativereferencesarecitedattheappropriateplacesint
19、hetext,andthepublicationsarelisted hereafter.Fordatedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplyto thisEuropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe latesteditionofthepublicationreferredtoapplies(includingamendments). ENISO176422
20、DestructivetestsonweldsinmetallicmaterialsColdcrackingtestsforweldments ArcweldingprocessesPart2:Selfrestrainttests(ISO176422:2004). ENISO176423 DestructivetestsonweldsinmetallicmaterialsColdcrackingtestforweldments ArcweldingprocessesPart3:Externallyloadedtests(ISO176423:2004). 3 Termsanddefinition
21、s ForthepurposesofthisEuropeanStandard,thefollowingtermsanddefinitionsapply. 3.1 coldcracks localrupture(intergranularortransgranular)appearingasaresultofacriticalcombinationofmicrostructure, stressandhydrogencontent NOTE1 Coldcracksarealsoknownashydrogencracksordelayedcracks. NOTE2 Coldcrackingoccu
22、rsattemperaturesbelowthesolidustemperature,sometimesdaysafterfabrication. 3.2 coldcrackingtestprocedures proceduresfordeterminingthecoldcrackingsensitivityofparentmaterials,weldsmetalandweldedjoints,in respectwiththeweldingprocedureused 3.3 selfrestrainttests testswherespecimenloadingisproducedbyres
23、idualstressesdevelopedduringandafterweldingofa restrainedweldment 3.4 externallyloadedtests testswherespecimenstressingistheresultofthetestprocedureandwherethespecimenisloaded externallyENISO176421:2004(E) 5 4Fundamentals Coldcracksoccuraftercompletecoolingwhenacriticalcombinationofmicrostructure,ap
24、pliedstressand hydrogenisexceeded: Themicrostructureisdefinedmainlybythechemicalanalysisandthecoolingtimebetween800Cand 500C(t8/5). Theappliedstressisinfluencedprimarilybythepotentialstresslevel,i.e.theyieldpointofthematerial, therestraintandshrinkagestressesappearinginthevicinityoftheweldimmediatel
25、yafterthewelding operation. Thehydrogencontentisdependentonthehydrogeninputasafunctionofthemoistureofthecoatingor fluxandthehydrogendiffusionasafunctionofthepreheat,interpassandholdingtemperature. NOTE ForsteelsforwhichthetransformationpointAc1isfarbelow500C,coolingtimebetween700Cand300C ismorerepre
26、sentative. Inthecoldcrackingtestprocedures,usingselfrestraintspecimens,thestressusedfortestingisprovided entirelybyweldshrinkage.Forthetypeofresultsandthemainapplication,seeTable1. Inthecoldcrackingtestprocedurewithexternallyloadedspecimensadefinedloadisimposedfromoutside byasuitableloadingdeviceont
27、hespecimenwhichproducesadefinedstress.Forthetypeofresultsandthe mainapplication,seeTable2. Table1Selfrestraintcoldcrackingtests(seeENISO176422)andtheirapplications TypesofTest Applications Qualificationofweldingconsumables,parentmaterialsandweldingprocedures. CTSTest Ygroovetest (Tekkentest) Ugroove
28、test (Lehightest) Determinationof: theminimumweldingenergy, theminimumpreheattemperature, theminimumholdingtemperature, themaximumdiffusiblehydrogencontent. NOTE Theprocedureprovidesaqualitative(cracks/nocracks)orquantitative(determinationofthe cracks/nocrackslimit)evaluation. Table2Externallyloaded
29、coldcrackingtest(seeENISO176423)anditsapplications Typeoftest Applications Implanttest Qualificationtestforconsumables,basematerials. Determinationof: theminimumweldingenergy, theminimumpreheattemperature, theminimuminterpasstemperature, theminimumholdingtemperature, themaximumdiffusiblehydrogencont
30、ent, thecriticalstress. NOTE Theprocedureprovidesaqualitative(cracksornocracks,singletest)orquantitative(crack/nocrack boundarydetermination)assessment.BS EN ISO 17642-1:2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible f
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