《管台焊接程序》ppt课件

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1、ASIAConstructionEngineeringTrainingConferenceFY2007ASIACONSTRUCTION:BUILDINGAIRPRODUCTSFUTURESeptember18to22,2006WeldoletweldingtechniqueWeldolet焊接管台Weldingsetup管台焊接的准备Weldoletweldingsequence管台焊接次序Especiallynote注意事项Sitephotos施工照片ASIACONSTRUCTION:BUILDINGAIRPRODUC

2、TSFUTUREWeldoletWeldingsetupReadytoweld:Everyfittingisshapedtofitthepipeandself-aligning焊接准备：每一个管台都被加工成适合管道的形状，以便对正Theoutletismachine-beveledforquickeasybutt-weldingofbranchpipeforshoporfieldfabrication管台焊接处被加工成坡口，以适合车间或现场支管快速对焊WeldingsetupLayout:thetemplateisins

3、ideofthefittingCuthole:theholeintherunpipeonreducingsizescanbecutouteitherbeforeorafterthefittingisweldedon.Theholecanbecutwithdrilloraholesaw.Weldingthefittingtorunpippriortocuttingtheholehelpspreventdistortionoftherunpipeandcanbedonegenerallyonoutletsizeovertw

4、oinches放置模板于管台内部开孔：变径管台在主观上的开孔既可以在焊接前也可在焊接后再开。可以用钻孔，也可用孔据开孔。先在主管上焊管台后开孔可以防止主管扭曲，一般适用大于2英寸的管台。WeldingsetupSpaceforwelding:Theweldoletisraisedofftherunpipetoestablishproperweldgapbyplacingspacers,e.g.weldingrodsunderthefitting.Thisprovidesauniformweldinggapbetweent

5、hecurvatureoftherunandbaseoffitting焊接间隙：管台焊接前要保证与主管的焊接间隙，例如放一根焊条在管台和主管之间。这样可以保证焊接根部间隙均匀。WeldingsetupTackweld:Thebasejointistackwelded,preferablyatfourpoints,eachhalfwaybetweenthecrotchandskirtsectionsoffitting.Thespacersaretheremoved点焊：根部需要点焊，建议4点，分布在管台的肩部，同时移掉间隙

6、物。WeldingsequenceLongitudinalsection:Widebasesorfootingsatcrotchsectiondistributeinternalandexternalstresses.Gradualchangesofsectioneliminatestressconcentration.Funnelshapedopeningprovidesimprovedflowdirection纵断面：分叉处存在内外应力，截面渐变消除了应力集中。漏斗状开口有利于流体流动。Weldingsequence

7、Transversesection:Notetheblendingoftheskirtsectionweldolettotherunpipetoavoidabruptchangeinintersection.Throatofweldatthispointisdesignatedbytheweldingbevel.横断面：管台裙叉处和主管处的坡口过渡可以避免交叉点的急剧变化，WeldingsequenceStringerbead:Thestringerbeadisappliedcompletelyaroundthebase

8、ofthefitting.Theestablishedweldgapassuresfullpenetration线型焊道：线型焊道紧紧环绕管台焊接，焊道间隙可以保证完全焊透。WeldingsequenceReinforcingbeads:Reinforcingweldsshouldbemadeatthecrotchb