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密封焊接施工作业指导书SiteExecutionGuidebook目录LIST1编制依据...................................................................................................................................1CompilingSources2作业项目概况及工作量.............................................................................................................1BrieflyIntroductiontoConstructionItemsandWorkingAmounts3作业必备条件.............................................................................................................................1WorkingNecessaryTerms4作业顺序、方法及要求.............................................................................................................5WorkingSequence,MethodologyandRequirement5作业过程对质量控制点的设置.................................................................................................9Tosetupqualitycontrollingterminprocessofworking6作业结束的检查验收和应达到的质量标准...........................................................................10Inspection&acceptanceafterachievementandrequiredqualitystandard7作业的安全要求及措施...........................................................................................................12SafetyRequirementandProtectiveMeasures1编制依据CompilingSources1.1《火力发电厂焊接技术规程》DL/T869-2004WeldingTechnicalRegulationsofThermalPowerPlantDL/T869-20041.2电站钢结构焊接通用技术条件DL/T678-1999GeneralTechnicalTermsofSteelStructureWeldinthePowerPlantDL/T678-19992作业项目概况及工作量BrieflyIntroductiontoConstructionItemsandWorkingAmounts2.1概述:BRIEF锅炉采用无锡华光锅炉股份有限公司生产的高温高压循环流化床锅炉。其型号为：UG-430/9.8-M。ThisBoilerisperformedasHigh-temperature&high-pressureCirculatingFluidizedBedBoilermadebyWuXiHuaguangBoilerManufactureCorporationLTD.AndthetypeisUG-430/9.8-M3.作业必备条件NecessaryWorkingConditions3.1本项工程配备焊工8--12人，参加焊接工作的施工人员必须有相适应的考试合格证，并经有关人员确认后方可进行焊接工作，施工人员须具备良好的施工工艺作风。3.18-12WeldersshouldbedesignatedtothisProject,whoarewithcorrespondentweldingcertificateandtobeallowedtocarryoutweldingafterbeingapproved&confirmedbyregardingpersonnel,andshouldbereliableforproperconstructiontechnicalcharacteristics.3.2配备直流逆变电焊机8—12台以及相应的二次线、配备相应焊工所需用的面罩、把钳、白光防护镜、绝缘手套等劳动防护用品。3.28-12setsofDCinverterweldingmachinesshouldbeequippedaswellassecondarycablesaccordingly,andnecessaryworkingprotectionfacilitiesintermsofmasks,pliers,gogglesandinsulationhandglovesshouldbeprovidedforwelders.3.3所用焊接材料必须有制造厂材质合格证、出厂日期证明。3.3Allofthefluxutilizedintheweldingworkshouldbewithapprovedcertificateandfactoryrelease-datecertificateofmanufacturingmaterials.3.4施工时必须有防雨措施，施工场地安全设施齐全、规范，设备、工具堆放整齐。3.4Rain-proofmeasuresshouldbedevelopedpriortoconstruction,andsafetyfacilitiesshouldbeperformedascompletionandspecializationinconstructionareas.Additional,equipments&toolsshouldbedumpedinordermanner.3.5焊前准备PreparationforWelding3.5.1焊接场所应有防雨和挡风等设施。3.5.1Shower-proof&wind-proofcanopyshouldbearrangedforweldingworkareas.3.5.2施焊前应清走周围及下方易燃物，防止火情的发生。3.5.2Flammablematerialslocatedinthevicinityandbeneathareasshouldberemovedbeforeconductionofweldinginpreventionofpotentialfirehazards.3.5.3焊接使用的电焊机应具备绝缘性良好，工作性能可靠等基本条件。3.5.3Weldingmachinesutilizedforweldingactivitiesshouldbereliableforsubstantialinsulationperformanceandstablyworkingconditions.3.5.4焊工的工器具应配备齐全，榔头、錾子、钢丝刷等清理工具应随身携带。3.5.4Facilities&toolsofweldersshouldbesufficientlyequipped;especiallytheclearingtoolsintermsofhammers,chisels,steelbrushesshouldbecarried.3.5.5各类部件联接处焊缝的接头型式和尺寸，应符合设计要求。如无规定时，应遵循能保证焊缝质量，减少焊接应力，防止结构变形，填充金属量少，操作方便，改善劳动条件等原则，且满足以下条件：3.5.5Jointtype&sizeofweldingseamsofallofpartsshouldconformtothedesignedspecifications.Ifnonspecialstipulations,itisnecessarytocomplywithregardingprinciplesastomakesureweldingquality,todeductweldingstressincaseofstructuredistortion,lessfillingofmetalmaterials,convenientoperation,toimproveworkingconditions;furthermore,shouldcaterforthefollowingterms:3.5.5.1焊件厚度为4-6mm时，可采取双面焊接，均可不开坡口，但必须留有1.5-2mm的对口间隙，并使焊件对正齐平确保焊透。3.5.5.1Double-facegrooveweldingcanbeperformedwhenthethicknessofweldingpartsiswithin4-6mm,whichcanbeconductedwithoutgroove.But1.5-2mmgapforfittingupofweldingjointsshouldremainsoastocompletelyweldinaxialdirectionandradialdirection.3.5.5.2搭接焊缝，搭接部位要求接触良好、平整，搭接长度不小于5倍母材厚度，且不小于30mm。3.5.5.2Asforoverlappingweldingseam,overlappingpositionisrequiredtocontactwellandincompactstatus,andlengthofoverlappingcontactshouldnotbe5timeslessthanthesameofmothermaterials,thatis30mm.3.5.5.3角接缝（包括T型接缝），其接头处要求对严，遇有间隙时，应采取措施予以修整。组对时边缘留有余量，其值不小于薄件厚度。3.5.5.3Asforfilletweldingseam(includingT-typejointseam),jointpointsshouldbecloselyfitted.Andrectificationactivitiesshouldbefulfilledwhenthegapappears.Edgesshouldbegivenabundancewhenassembling,ofwhichshouldnotbelessthanthethinpart.3.5.5.4所有焊件（焊缝尺寸高度）及接头部位应按施工图纸规定要求进行焊接。3.5.5.4Alloftheweldingparts(sizeandheightofweldingseam)andjointpointsshouldbecarriedoutweldingasperdetailsshownintheregardingschematicconstructiondrawing.3.5.6焊件坡口的加工可采用机械法或气割法。如采用气割法加工时，应将割口处表面的氧化物、毛刺等清理干净，并将凹凸不平处修理平整。3.5.6Machiningforweldinggroovesoftargetscanbeperformedbymeansofmechanicalorgascutting.Ifthegascuttingwereapplied,oxidesandburrsindicatedonthesurfaceofcuttingpointsshouldbegrindingoff,aswellasblursshouldberectifiedu