BS 4871-3-1985 按认可焊接工艺操作的焊工鉴定考试规范.第3部分金属管与管板接头间电弧焊

BRITISHSTANDARDBS4871-3:1985SpecificationforApprovaltestingofweldersworkingtoapprovedweldingprocedures—Part3:Arcweldingoftubetotube-platejointsinmetallicmaterialsUDC621.791.007.2:331.108.376:[669-462:621.791.75]BS4871-3:1985ThisBritishStandard,havingbeenpreparedunderthedirectionoftheWeldingStandardsCommittee,waspublishedundertheauthorityoftheBoardofBSIandcomesintoeffecton29March1985©BSI12-1998ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceWEE/36Draftforcomment83/79157DCISBN058014366XCommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbytheWeldingStandardsCommittee(WEE/-)toTechnicalCommitteeWEE/36,uponwhichthefollowingbodieswererepresented:AluminiumFederationAssociatedOfficesTechnicalCommitteeAssociationofConsultingScientistsBritishConstructionalSteelworkAssociationBritishGasCorporationBritishRailwaysBoardElectricitySupplyIndustryinEnglandandWalesEngineeringEquipmentandMaterialsUsers’AssociationHeatingandVentilatingContractors’AssociationMinistryofDefenceNationalCoalBoardPowerGenerationAssociation(BEAMALtd.)ProcessPlantAssociationSocietyofMotorManufacturersandTradersLimitedStainlessSteelFabricators’AssociationofGreatBritainUnitedKingdomAtomicEnergyAuthorityWater-tubeBoilermakers’AssociationWeldingInstituteWeldingManufacturers’Association(BEAMALtd.)CooptedmemberAmendmentsissuedsincepublicationAmd.No.DateofissueCommentsBS4871-3:1985©BSI12-1998iContentsPageCommitteesresponsibleInsidefrontcoverForewordii1Scope12Definitions13Informationtobegiventothewelder14Itemstoberecorded15Changesnotaffectingapproval(otherthanmechanizedorautomaticwelding)16Extentofapproval37Testpieces48Submissionoftestweld49Examinationandtesting410Statementofresults611Re-approvalofwelder6AppendixARecordofapprovaltestofwelder8Figure1—Testpiecefortubeendsontriangularpitch4Figure2—Testpiecefortubeendsonsquarepitch5Figure3—Typicalexamplesofmacro-examinationspecimens6Table1—Weldmetal/parentmetalcombinations2Table2—Extentofapprovalforweldmetalgroups2Table3—Acceptancelevels7PublicationsreferredtoInsidebackcoverBS4871-3:1985ii©BSI12-1998ForewordThisPartofBS4871hasbeenpreparedunderthedirectionoftheWeldingStandardsCommitteetocovertheparticularrequirementsfortheapprovaltestingofweldersfortubetotube-platejoints.Whilethereisnolimitationonthemetallicmaterialstobeused,extraconsiderationsnotcoveredinthisstandardmayneedtobetakenintoaccountforsomematerials.ThisPartofBS4871isoneofaseriesofstandardsontheapprovaltestingofweldersandweldingprocedures,thelatterhavingabearingontheformerforcertainapplications.ThislinkhasbeenusedasameansofarrangingthePartsofthestandardsfortubetotube-platejointsinto:a)approvaltestingofweldingprocedures(seeBS4870-3);b)welderapprovalwhenapprovaloftheweldingprocedureisrequired.Itshouldbeappreciatedthattheacceptancelevelsgiveninthisstandardareforthepurposesofapprovaltestingofweldersandassucharenotnecessarilythesameasthosewhichmightbespecifiedforworkonwhichapprovedwelderswillbeemployed.Dependingupontheemphasisplacedonqualitycontrolintheproductionofweldedcomponents,theapprovalofweldingprocedurescoveredinthisseriesofstandardsmaybeadministeredinoneofseveralwayswhichshouldbestipulatedattheenquiryand/ororderstage.Thealternativescurrentlyemployedarethefollowing:1)eachindividualcontractor(orsub-contractor)mayhaveprovedbyactualtestpieceseveryweldformhewishestouse,ineverythicknessandmaterial;or2)eachindividualcontractor(orsub-contractor)mayhaveprovedbyactualtestpiecesasetofweldsrepresentativeonagroupbasisofallthevariousthicknessesandmaterialstobeusedinproduction;or3)eachindividualcontractor(orsub-contractor)neednotmakeproceduretestpiecesprovidedhecanprovebyappropriatedocumentationofanindependentnaturethathehaspreviouslysatisfactorilyweldedthetypeofjointandmaterialinquestion.Inrespectof(1)and(2)itshouldbeappreciatedthatoncetheweldingproceduretestshavebeenapproved,theyneedneverberepeatedunlessthereisachangeincertainvariables.Asanextensionbeyond(3),itmaybepossiblebyagreementbetweenthecontractingpartiesforfullydocumentedweldingprocedures,developedindependentlyoftheparticularcontractor,tobeemployedwithouttheneedforfurtherapprovaltests.IthasbeenassumedinthedraftingofthisBritishStandardthattheexecutionofitsprovisionsisentrustedtoappropriatelyqualifiedandexperiencedpeople.ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectapplication.CompliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,pagesiandii,pages1to10,aninsidebackcoverandabackcover.Thisstandardhasbeenupdated(seecopyrightdate)andmayhavehadamendmentsincorporated.Thiswillbeindicatedintheamendmenttableontheinsidefrontcover.BS4871-3:1985©BSI12-199811ScopeThisPartofBS4871specifiesrequirementsfortheapprovaltestingofwelderstobeengagedonthemanual,semi-automatic,automaticormechanizedarcweldingofthosetubetotube-platejointsinmetallicmaterialsforwhichanapprovedweldingprocedurehastobeem