简介：WeldingresearchofA6N01S-T5aluminumalloyprofileforhigh-speedtrainwasdonebyusinglaser-MIGhybridweldingandMIGweldingindividually.Andtheweldappearance,weldingdistortion,mechanicalpropertiesofthejointsandmicrostructureswereanalyzed.Thetestresultsdemonstratedthathigh-efficientweldingfortheprofilecanbeachievedbyusinglaser-MIGhybridwelding,thespeedofwhichcanbeover3.0m/min.Theprocessinghadagoodgapbridgingability，evenifthegapofthebuttjointwasupto2.0mm,agoodweldappearancecanalsobegot.Whilethehybridweldingspeedwasgreaterthan2.5m/min,theweldingdistortionofthelaser-tandemMIGhybridjointswasjustabout33%ofthatoftheMIGjoints,buttheweldingefficiencywasover3timesofMIGwelding.Andtensilestrengthofthehybridjointswas85%ofthatofA6N01S-T5basemetal,9%higherthanthatoftheMIGjoints.Fatiguepropertieswastestedindividuallywithpulsedtensilefatiguemethodintheconditionof1×107lifetime.Thetestresultsdemonstratedthatthefatiguestrengthofthejointswasalittlelowerthanthatofbasematerial,whichcouldbeupto115MPa.Butthefatiguestrengthofhybridweldingjointswas107.5MPa,whichwas23%higherthan87MPaofMIGweldingjoints.

简介：DD6alloywasbondedbytransientliquidphase(TLP)diffusionbonding.Themaincompositionsoftheinterlayeralloyemployedweresimilartothoseofthebasemetal,DD6,andacertainamountofelementBwasaddedasthemeltingpointdepressant.Theresultsshowthatitisdifficulttoobtainthejointswiththemicrostructurescompletelyhomogeneous.ForthejointTLPdiffusionbondedat1290℃for12h,abouthalfareasofthebeampossessedαγ+γ′microstructure,nearlyidenticalwiththatofthebasemetal,andtheotherlocalareasconsistedofT-solution,borides,etc.Prolongingthebondingtimeto24h,theinhomogeneousareasinthejointreduced,andthejointpropertyimproved.Thejointstress-rupturestrengthat980℃and1100℃reached90%-100%and70%-80%ofthoseofthebasemetalrespectively.

简介：Theeffectofnonmetallicinclusionsinthedropletofthestainlesssteelcoveredelectrodeontheporositywasresearched.Theresultshowsthatthenonmetallicinclusionsinthedropletarespherical,theircompositionisdifferentfromtheoneofslagandtheinclusionshavethecharacterof"innerformation".Whentheratioofrutiletoilmeniteinthecoatedmaterialisincreased,thedropletbecomescoarse,thecontentofnonmetallicinclusioninthedropletdecreases,andtheporositysensitivityintheweldmetalalsodecreases.Whentheratiooffledspartoilmeniteinthecoatedmaterialisincreased,thedropletbecomesfine,thecontentofnonmetallicinclusioninthedropletincreases,andtheporositysensitivityintheweldmetalincreases.WhentheratioofFe2O3toilmeniteinthecoatedmaterialisincreased,thedropletbecomesfine,thecontentofnonmetallicinclusiondecreases,whiletheporositysensitivitydoesnotreduce.

简介：第二十届北京·埃森焊接与切割展览会6月16~19日即将在上海新国际展览中心举办,国内焊接设备制造领军企业之一的山东奥太电气有限公司届时将携带多款重量级的新品在观众面前亮相。

简介：FlameheatingcombinedwithwatercoolingwasusedtostraightenA6N01aluminumalloyweldedjointandeffectofflameheatingpassonitsmicrostructureandmechanicalpropertieswasstudied.ResultsshowedthattheflameinducedtheprecipitationandgrowthoftheMg2SiphaseontheAlsubstrateforthethermalagingA6N01aluminumalloyweldedjoints,thusitledthedecreaseofmicro-hardnessandtensilestrengthoftheA6N01aluminumalloyweldedjointwiththeincreaseoftheheatingpass.However,thefatiguepropertyoftheflameheatedjointwasimprovedbecausetheMg2Siprecipitationhinderedtheinitiationandpropagationofthefatiguecrack.

简介：Inthispaper,6mmthick2219-T6aluminumalloywasjoinedbymeansofvariablepolaritytungsten-arcwelding(VP-TIG)andtheinfluenceofgradientmismatchesonVP-TIGjointsisinvestigated.Theaveragetensilestrengthofthejointsreduces32%,53%and59%,whenthemismatchofthejointwas0.635mm,1.44mm,1.83mm,respectively.Incompletepenetration,additionalbendingmoment(Ma)anddecreaseofeffectiveloadregionareaareconsideredtoexplainthisphenomenon.Thefracturelocationoftensilespecimensoccurredattheweldzone(WZ)closetopartialmeltzone(PMZ),correspondingtoasharpdeclineofmicrohardnessfromPMZtoWZ.Theoriginalpositionoffractureisfoundatweldtoe,whereincompletepenetrationformsduetotheintroductionofgradientmismatches.

简介：ThesusceptibilityofweldedjointfortheX65pipelinesteeltoH2Sstresscorrosioncracking(SCC)isinvestigated.SCCtestsonthesteelarecarriedoutintheenvironmentbasedonNACETM-01-77solutionwithsaturatedgaseousH2S.Thethresholdstressintensityfactorandcrackpropagationvelocityarecalculatedaccordingtowedge-openingloading(WOL)specimens.Thethree-dimensionalelastic-plasticfiniteelementanalysisofWOLspecimensisperformedbyusingtheFEMprogrammingpackageANSYS.Stressfieldandconcentrationofhydrogendistributionpropertyaheadofthecracktipareobtained.ThispapersurveyedthemicrostructureofweldedjointandstudiedonthemechanicalpropertiesofX65pipelinesteel.Itprovidesexperimentalbasisforstudyingstresscorrosion.Theresultsofnumericalanalysisareconsistentwithconclusionsofstresscorrosiontest.

简介：Stationaryshoulderfrictionstirlapwelding(SSFSLW)wassuccessfullyusedtoweld6005A-T6aluminumalloyinthispaper.EffectofpinrotatingspeedoncrosssectionmorphologiesandlapshearstrengthoftheSSFSLWjointsweremainlydiscussed.Resultsshowthatjointswithoutflashandshouldermarkscanbeobtainedbythestationaryshoulder.CrosssectionoftheSSFSLWjointpresentsabasin-likemorphologyandlittlematerialloss.Byincreasingtherotatingspeedfrom1000rpmto1600rpm,botheffectivesheetthicknessandlapwidthincrease,whilelapshearfailureloadfirstlydecreasesandthenincreases.Themaximumfailureloadof14.05kNisattainedwhen1000rpmisused.AllSSFSLWjointspresentshearfracturemode.

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简介：水泥储罐的建造严格根据国家的相关制作标准，同时结合甲方的合同要求进行按图施工。它主要由这几部分组成：罐顶、筒身、裙座、锥体、钢结构支撑、开孔接管以及梯子平台等工装制作。焊接质量控制关乎到整个项目始终，本文主要论述了在整个焊接质量控制过程中，施焊过程控制的重要性，重点把握好装焊制作节点，做好节点控制。另外加强对现场巡检力度，减少违工艺操作、违安全操作、不懂乱操作等现象，避免质量事故的发生。

简介：<正>为实施《国家中长期科学和技术发展规划纲要(2006～2020年)》(国发〔2005〕44号),营造激励自主创新的环境,努力建设创新型国家,根据《国务院关于印发实施〈国家中长期科学和技术发展规划纲要(2006～2020年)〉若干配套政策的通知》(国发〔2006〕6号),建立国家自主创新产品认定制度,规范自主创新产品认定工作,特制定本办法。

简介：<正>企业管理系统终日忙绿,订单总是不能按时完成。客户不断投诉和抱怨,老总使尽浑身解数,心力交瘁:成本啊!交货期啊!利润啊!……这是中小企业的普遍状况。

简介：一名成熟的管理者，应该打破旧的管理模式，引导团队步入现代企业管理的轨道；一名成熟的管理者，应充分发挥团队精神，让员工在团队精神下人尽其才，充分发挥出自己最大的优点，将企业发展的压力真正转化为企业发展的动力……

简介：<正>2009年10月15～16日,中国机械工业企业管理协会和山东省机械工业联合会联合咨询考察,依据国家机械工业"管理进步示范企业"的评价标准,对山东聚力焊接材料有限公司创建国家机械工业"管理进步示范企业"工作进行了现场考察。

简介：GB／T15579．5-2005《弧焊设备安全要求第五部分：送丝装置》和GB／T15579．7-2005《弧焊设备安全要求第七部分：焊炬（枪）》（以下简称新标准）已于2005年12月1日正式实施。自新标准实施之日起．JB/T9533-1999《焊机送丝装置：技术条件》、JB／T9526-1999《TIG焊焊炬技术条件》和JB／T9532-1999《MIG／MAG焊焊枪技术条件》（以下简称旧标准）废止。

简介：<正>突如其来的"非典"不可避免的打乱了国内诸多企业的年度工作计划和正常的经营活动,但从另一角度来看,"非典"对企业的应变能力是一种考验,也会激发出对平常时期疏忽问题的思考。当前众多企业除了制定一些应急的预防措施以外,似乎还没有为此次突发事件做出更多的分析和准备,这从根本上暴露了国内企业防范重

简介：第一章总则第一条中国电器工业协会（以下简称中电协）根据协会章程和行业发展的需要，并依据上级管理部门有关规定设立分支机构。为加强对分支机构的领导和管理，根据国务院《社会团体登记管理条例》（1998年中华人民共和国国务院第250号令）、民政部《社会团体分支机构、代表机构登记办法》（2001年民政部第23号令）、

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