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.

简介：

简介：焊接技术的发展都是以焊接高效率化和高产能化为最大目标。要实现高效率化焊接重要措施之一就是提高焊接速度,一般熔化极气保焊的焊接速度仅为0.3－0.5m/min。当焊接速度较高时（〉0.6m/min）易产生焊道不连续、咬边和产生大量气孔等缺陷,因而研究、推广焊接高效率化的技术成果是我国焊接领域里的重要课题。本文介绍一种在造船行业和钢结构焊接领域里常见型钢简捷、高效化平角焊接方法。即用双丝-熔池简捷高效快速焊接（焊接速度为1.2－1.5m/min,焊脚高度5mm）时也能达到良好的焊接规范和焊接性能的高效化平角焊接方法。经过多年的在造船行业和钢结构焊接中的T型钢焊接生产中证明,采用双丝-熔池气体保护焊可提高T型钢生产效率和焊接质量,减少焊接变形,因而双丝-熔池气体保护焊得到快速发展和广泛的应用。

简介：工业机器人自动焊钳属日常主要维护设备,由于更换修复后的焊钳空间坐标值存在偏差,所以每次都需要重新手动修正机器人程序,每次修正机器人轨迹需要60～75min时间,费时费力。由此开发机器人程序快速修正软件,将修正机器人轨迹时间降低到只需5min,节约大量成本并产生很高的经济效益。

简介：本文针对大功率（10kW）光纤激光焊接304不锈钢紧密对接焊，研究一种在线熔池宽度预测的新方法，首先由图像处理获得熔宽的实时测量值，然后用有限冲激响应FJR（FiniteImpulseResponse）滤波器对其滤波使得宽度值平滑，分析熔宽实时测量值经过FIR滤波后与熔宽实际值之间的关系。

简介：本文论述了传统焊接方法、高能束焊接方法和特种焊接方法的当代发展水平,重点介绍了在现代工业生产中普遍应用的TIG、MIG/MAG、埋弧焊和等离子弧焊的新发展,推进了焊接工艺成为重大装备工业中最重要的先进制造技术之一。

简介：电厂焊接工艺的质量对于电厂工程质量起着关键性的作用。为了保证电厂的施工质量，要对电厂焊接施工的工艺进行严格的控制。在相关电厂焊接工程的检验中，要对焊接的质量格外注意，发现焊接工艺中的原因，采用相应的应对方法，控制焊接工艺中的缺陷问题，最终保证电厂相关工程的稳定、安全、经济运行。本文针对电厂焊接工程的缺陷产生原因进行了全面详细的分析，并提出了相应的处理措施。

简介：在生产中一些盛水盛油和充气的容器设备或管道在使用过程中，有时发生泄漏现象，由于种种原因不可能泄压放水（汽、油）或者放不干净，而要求带水带压进行焊接修复，以保证企业安全生产。本文根据多年实践经验，参考国内同行的相关资料，阐述带水（汽）、带压焊接修复技术和常用的操作方法。

简介：城市自来水供水管道面临各种停水故障情况，本文分析产生的原因和技术难点，总结解决漏水带压补焊的方法。

简介：

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。