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1Content目录1.Projectoverview工程概况..........................12.Fabricationreference编制依据.....................13.Constructionfeatures施工特点.....................14.Constructionpreparation施工准备..................24.1.Preparationbeforewelding焊前准备..........................................24.2.Constructionworkingconditionspreparation施工作业条件准备.....................................................................................................................45.Constructionprocess施工工艺......................45.1．Wedlingprocess焊接工艺........................................................45.2．Rootcleannessprocess清根工艺.............................................66.Constructionattentions施工注意事项...............77.Safetyhousekeeping安全文明施工...................87.1.Safetyassurancemeasures安全保证措施...................................87.2.Housekeeping文明施工..............................................................911.Projectoverview工程概况Completed,inordertoefficientlyshelflifefortheengineeringcharacteristicsoflargediametercarbonsteelpipelineweldingtasks,withcarbondioxidegasshieldedweldingthebassoonweldwhenneeded.针对本工程的碳钢管线直径大的特点，为了高效保质完成焊接任务，焊接大管焊缝时需要用二氧化碳气体进行保护焊接。2.Fabricationreference编制依据1、Theconstructioncontractandtheownersoftheprojectconstructionplans本工程施工合同及业主提供的本工程施工图；2、Theprojectsaudited,approvedtheconstructionorganizationdesign;本工程经审核、批准的《施工组织设计》；3、《Thecarbondioxidegasshieldedweldingwire》GB8110—2008《二氧化碳气体保护焊用焊丝》GB8110—20084、《Specificationforweldingofsteelstructurebuildings》JGJ81—2002《建筑钢结构焊接技术规程》JGJ81—20025、《Gaswelding,manualarcweldingandgas-shieldedarcweldingweldgroovebasicformandsize》GB985.1-2008.《气焊、手工电弧焊及气体保护焊焊缝坡口的基本形式与尺寸》GB985.1-2008.6、《Codeforacceptanceofconstructionqualityofsteelstructures》GB50205—2001《钢结构工程施工质量验收规范》GB50205—20013.Constructionfeatures施工特点1、Weldappearance,weldmoldingnolongerpolished,uniformweldgeometry.焊缝成型美观，焊缝焊接成型后无需再打磨处理，焊缝几何尺寸均匀一致。2、Lessweldspatter,flux-coredarcstabilizeradded,stablearcburningdropletwasdropwiseevenexcessivewhenweldingspatterfewsmallparticlesandsplashing,2coolingfaster,easiertoclear.焊接飞溅少，药芯焊丝在其中加入了稳弧剂，电弧燃烧稳定，熔滴呈滴状均匀过度，故焊接时飞溅很少，且飞溅颗粒细小，冷却速度快，清除较容易。3、Weldshrinkagedeformationissmall,duetotheweldingheatinputfocus,smallheat-affectedzone,weldshrinkagedeformationissmall,smallweldingresidualstress.焊缝收缩变形小，由于其焊接热量输入集中，热影响区小，因此焊接收缩变形小，焊接残余应力小。4、Highweldingefficiency,highcurrentdensityfilamentsautomaticwelding,determineitshighermeltingfillspeed,therebygeneratingahighweldingspeed,andtheautomaticweldingprocessandeliminatestheneedforfrequentreplacementofthemanualweldingelectrodetime.焊接效率高，细丝自动焊的高电流密度，决定了其较高的熔填速度，从而产生较高的焊接速度，且自动焊过程省去了手工焊中频繁更换焊条的时间。4.Constructionpreparation施工准备4.1.Preparationbeforewelding焊前准备1.Weldinggroove焊接坡口：（1）TheweldgrooveofaV-shapedgroove.焊缝坡口为V型坡口。（2）Theweldinggrooveshallbesmooth,nocracks,delamination,slagandotherdefectsdimensionsconformtothepatternprovisions.焊接坡口应平整，不得有裂纹、分层、夹渣等缺陷，尺寸符合图样规定。（3）Surfaceofthegrooveandoneachsideof50mmbeforeweldingwater,rust,oil,productresidueandotherharmfulimpuritiesintheweldingshouldbecleaned.坡口表面及两侧各50mm焊前应将水、铁锈、油污、积渣和其它有害于焊接的杂质清除干净。（4）Weldgroupgapshouldbe3±1mm.焊缝组对间隙宜为3±1mm.2、Weldingmaterial焊接材料：3CO2gasshieldedweldingtoφ1.2ER70S-6wire,toprotectthegasusingCO2.CO2气体保护焊采用φ1.2的ER70S-6焊丝，保护气体采用CO2。3、Weldingwiremanagement焊丝管理：（1）StartingweldingwiremusthavefactorycertificateofchemicalcompositionandmechanicalpropertieswithinthewarrantybookmustcomplywiththerelevantprovisionsoftheState.施焊中的焊丝，必须具有出厂合格证书，质保书内的化学成份及机械性能必须符合国家有关规定。（2）Wireintotheboxpackaging,theofficialshallnotbeopenedbeforeweldingtopreventmoistureintheair.焊丝成盒包装，正式施焊前不得拆封，以免在空气中受潮。（3）Theweldingmaterialdesignatedpersonsresponsibleforthesafekeeping,disbursementandrecovery.焊接材料设专人负责保管、发放和回收。（4）Theweldingconsumableslibrarymustbekeptdry,relativehumiditylessthan60%ofthecoffersofnotlessthan10°Ctemperature.焊材库必须保持干燥，相对湿度不大于60%，库房内的温度不低于10℃。4、Weldercertificate焊工资格：TheweldermustholdacertificateissuedbytheBureauofLaborBoilerandPressureVesselwelders,eligibleprojectsareasfollows:焊工必须持有劳动局颁发的锅炉压力容器焊工考试合格证，合格项目如下：（1）Automaticgasshieldedwelding:RZ2-5、RZ2-6、RZ2-7、RZ2-8.气体保护自动焊：RZ2-5、RZ2-6、RZ2-7、RZ2-8.（2）Semiautomaticgasshieldedwelding:Rb2-5、Rb2-6、Rb2-7、Rb2-8.气体保护半自动焊：Rb2-5、Rb2-6、Rb2-7、Rb2-8.（3）Weldercertificationinweldingsteelsshould16MnR.焊工合格证中施焊钢种应为16MnR.5、Weldingequipment焊接设备：GasprotectweldingshalladoptDC-400power、LN-9GMAwirefeedingmachineandBug-oautocar.4气体保护焊选用DC-400电源、LN-9GMA送丝机及Bug-o自动小车。4.2.Constructionworkingconditionpreparation施工作业条件准备1、Theweldingenvironmentinanyofthefollowingconditionsmustadopteffectiveprotectivemeasures,otherwisestopwelding:焊接环境出现下列任一情况时，必须采用有效防护措施，否则停止焊接：（1）Windspeedmorethan8m/s;风速大于8m/s；（2）Relativehumiditymorethan90%;相对湿度大于90%；（3）Rainandsnow雨天及雪天；（4）Environmenttemperatureunder-5℃.环境温度在-5℃以下。2、Theweldingenvironmentinanyofthefollowingconditionsmustadopteffectiveprotectivemeasures,otherwisestopwelding:施焊应在坡口内引弧，禁止在非焊接部位引弧。3、Groundcable,weldingclamp,weldingtorchmustbeagoodcontact.地线、电缆线、焊钳、焊枪必须接触良好。4、Theweldedconstructionsituationshouldbesomeoneresponsiblefortherecordtheambienttemperaturea