简介：TheanalysisofthemicrostructuralcharacterizationandphasecompositionofelectronbeamweldedjointzonesofTi-43Al-9V-0.3Yalloyhasbeendoneinthisstudy.TheweldedseamismainlycomposedofB2phase,thepartialγ+α2two-phaselamellarstructureandgranularγmphase.AndthelanthanonYexistedasYAl2phaseandservedasgrainrefined.Theimpactofdifferentcoolingratesonjointmicrostructure,fracturecharacteristicandtensilestrengthwereinvestigated.Thehighcoolingraterestrainedthestructuraltransformationandresultedintheorderingstructure.Thefractureofthejointwasbrittlecleavagefracturebecausetheorderingstructurewentagainstrestrainingthecrackpropagation.Withthedecreaseofcoolingrate,thetransformationamountsoflamellarstructureincreased,andthefracturepresentedthelayeredandcross-layeredcharacteristic.

简介：TheHAZmicrostructureandperformanceofQuenchingandTemperingmodetemperbeadweldingandgeneralweldedjointswhichweremadeonSA508-3steelof60mmthicknesswerecomparedinthisarticle.Theresultshowsthattemperingsorbitewhichhasexcellentoverallperformancewasobtainedinbothmodes.ThemicrostructureofQuenchingandTemperingmodeweldedjointsgotmorefinegrain.Eventhoughthehardnessoftemperingbeadweldedjointsishigherthanthegeneralone,itstillmeetsthestandardswhichislowerthan350HV.TheimpactabsorbingenergyofeachdistrictoftemperingbeadweldedjointsHAZreached170J,whichisequaltogeneralone.

简介：Thispaperreportstheeffectoffrictionstirwelding(FSW)processparametersontensilestrengthofcastLM6aluminiumalloy.Jointsweremadebyusingdierentcombinationsoftoolrotationspeed,weldingspeedandaxialforceeachatfourlevels.Thequalityofweldzonewasinvestigatedusingmacrostructureandmicrostructureanalysis.Tensilestrengthofthejointswereevaluatedandcorrelatedwiththeweldzonehardnessandmicrostructure.Thejointfabricatedusingarotationalspeedof900r/min,aweldingspeedof75mm/minandanaxialforceof3kNshowedsuperiortensilestrengthcomparedwithotherjoints.Thetensilestrengthandmicrohardnessoftheweldedjointsfortheoptimumconditionswere166MPaand64.8Hvrespectively.

简介：Thepresentstudyisconcernedwiththeeffectoffillermetalssuchasausteniticstainlesssteel,ferriticstainlesssteelandduplexstainlesssteelontensileandimpactpropertiesoftheferriticstainlesssteelconformingtoAISI409Mgrade.Rolledplatesof4mmthicknesswereusedasthebasematerialforpreparingsinglepassbuttweldedjoints.Tensileandimpactproperties,microhardness,microstructureandfracturesurfacemorphologyofthejointsfabricatedbyausteniticstainlesssteel,ferriticstainlesssteelandduplexstainlesssteelfillermetalswereevaluatedandtheresultswerereported.Fromthisinvestigation,itisfoundthatthejointsfabricatedbyduplexstainlesssteelfillermetalshowedhighertensilestrengthandhardnesscomparedtothejointsfabricatedbyausteniticandferriticstainlesssteelfillermetals.Jointsfabricatedbyausteniticstainlesssteelfillermetalexhibitedhigherductilityandimpacttoughnesscomparedwiththejointsfabricatedbyferriticstainlesssteelandduplexstainlesssteelfillermetals.

简介：在磨擦促使焊接(FSW)，工具几何学在联合质量起一个重要作用。为了改进磨擦的机械性质，促使焊接的臀部(FSLW)关节，有一根颠倒线程的大头针的一个工具在现在的学习被设计。用是的2024-T4铝合金，研究目标，有完整线程的大头针的工具和颠倒线程的大头针在FSLW被使用。结果用一样的参数联合看了那是否，用颠倒线程的大头针联合的FSLW拥有了更大的有效的表厚度(EST)，更大的臀部宽度和更好的臀部砍失败力量。与完整线程的大头针相比，FSLW关节的破裂模式变化了从砍当颠倒线程的大头针被使用时，折断模式到张力的破裂模式。破裂形态学介绍了可锻的骨折。

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简介：ＣｏｍｐａｒｉｓｏｎｏｆｍｅｃｈａｎｉｃａｌｐｒｏｐｅｒｔｉｅｓｉｎｗｅｌｄｅｄｊｏｉｎｔｆｏｒＣＯ２ａｒｃｗｅｌｄｉｎｇｂｙｕｓｉｎｇｔｈｅｍｉｃｒｏ－ｓｈｅａｒｔｅｓｔａｎｄｉｍｐａｃｔｔｅｓｔ￥ＺｈｏｕＬｉｘｉａ；ＷａｎｇＳｈｉｙｕａｎａｎｄ?..

简介：AA6005A-T6铝空挤出是磨擦搅动以2000的高焊接速度焊接了?mm/min和各种各样的轴的力量。结果证明金块地区(NZ)被好equiaxed谷物，平衡阶段的低密度在被观察描绘。在thermo机械地影响的地区(TMAZ)的谷物被伸长，并且脱臼的最高的密度和低密度猛抛能在谷物被发现。热影响地区(HAZ)仅仅经历一个低热周期，和高密度猛抛并且低密度猛抛在变粗的谷物的遗体。在NZ，TMAZ和HAZ的microhardness进化被谷物管理分别地加强的加强的加强的精炼和脱臼，脱臼和降水，和降水和稳固的答案。当增加轴的力量时，加强机制的变化趋势与在每个地区的其它相反，并且microhardness在不同地区增加。作为结果，张力的力量粗略地与提起轴的力量增加，并且所有连接表演高焊接速度禁止变粗，加强的溶解显著地猛抛的好张力的性质。

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

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简介：Thehighstrengthlow-alloysteelsareweldedbyunderwaterwetweldingwithstainlesssteelelectrodes.Themicrostructuralandelectrochemicalcorrosionstudyofbasemetal(BM),weldzone(WZ)andheataffectedzone(HAZ)arecarriedouttounderstandtheinfluenceofthecorrosionproductlayergeneratedonthehighstrengthlow-alloysteelsweldedbyunderwaterwetweldingwithstainlesssteelelectrodes,methodsusedincluding,potentiodynamicpolarization,electrochemicalimpedancespectroscopy(EIS)andscanningelectronmicroscope(SEM).TheresultsindicatethattheWZactsasacathodeandthereisnocorrosionproductonitthroughouttheimmersionperiodinseawater.TheHAZandBMactsasanodes.ThecorrosionratesoftheHAZandBMchangewiththeimmersiontimeincreasing.Intheinitialimmersionperiod,theHAZhasthehighestcorrosionratebecauseithasacoarsetemperedmartensitestructureandtheBMexhibitesamicrostructurewithveryfinegrainsofferriteandpearlite.Afteraperiodofimmersion,theBMhasthehighestcorrosionrate.ThereasonisthatthecorrosionproductlayerontheHAZisdenseandhasabetterprotectivepropertywhilethatontheBMislooseandcannotinhibitthediffusionofoxygen.

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

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简介：这研究调查低温实验法的张力的性质和小说的破裂行为搅动焊接并且32Mn-7Cr-1Mo-0.3N钢的焊接以后的对待热的关节。低温实验法的易碎的骨折，发生在同样焊接的关节，与在联合乐队结构包含钨的剩余粒子有关。韧化的焊接以后的水导致了关节的低温实验法的intergranular易碎物，它在韧化的焊接以后的水期间与溶质原子的非平衡分离有关。在550点退火吗？？

简介：Themechanicalproperties,creepdamage,creeprupturestrengthandfeaturesofinterfacialfailuresofweldedjointsbetweenmartensite(SA213T91)andpearlitesteel(12Cr1MoV)havebeeninvestigatedbymeansofargontungstenpulsedarcwelding,hightemperatureacceleratedsimulation,creeprupture,mechanicalpropertytestsandscanningelectronicmicroscope(SEM).Theresearchresultsindicatethatthemechanicalpropertiesofovermatchedandmediummatchedjointdeteriorateobviously,andtheyaresusceptibletocreepdamageandfailureafteracceleratedsimulationoperation500h,intheconditionofpreheat250℃,andpostweldingheattreatment750℃×1h.However,themechanicalpropertiesofundermatchedjointarethebest,theinterfacialfailuretendencyofundermatchedweldedjointislessthanthoseofmediumandovermatchedweldedjoint.Therefore,itisreasonablethatlowalloymaterialTR31isusedasthefillermetalofweldbetweenSA213T91and12Cr1MoVsteel.