简介：在这研究，极其细小颗粒(UFG)冷滚动制作的6061艾尔合金是磨擦促使(FSW)与在两表情下面的不同旋转率冷却焊接并且在水里的快速的冷却。400的Low-heat-input参数?水(400水)里的rpm旋转率能有效地禁止重新使结晶的谷物变粗，减少降水率，并且保留UFG6061艾尔父母金属的更多的脱臼。400水关节显示出高低坚硬的价值，狭窄的低坚硬的地区，和高张力的力量，归因于脱臼的效果，谷物边界，稳固答案，并且降水变硬。这个工作提供有效策略由与大变丑和low-heat-inputFSW的冷滚动制作大尺寸的体积艾尔·乌夫格合金。

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简介：TheinfluenceofrareearthoxideCeO2onmicrostructureandwearresistanceofM80S20thermalsprayandthermalsprayweldingcoatingsisstudiedusingopticalmicroscope,scanningelectronmicroscope,X-rayenergydispersionspectroscope,X-raydiffractometerandweartestingmachine.Theresultsshowthattheaddi-tionof8%CeO2canimprovethemicrostructure,microhardnessandwearresistanceofcoatingssignificantly.

简介：Advancedhighstrengthsteel(AHSS)hasbeenwidelyusedintheautomobileindustry.TheresistancespotweldingperformanceofDP980andQ&P980steelswasstudiedthroughcomparingthetwosteels'weldingcurrentrange,tensileshearstrength(TSS),crosstensionstrength(CTS),weldspots'microhardness,etc.Thefollowingconclusionswereachieved:ItiseasyforbothDP980andQ&P980steelstogetanuggetsizebiggerthan4mm,theyallhaveweldingcurrentrangesexceeding2kAandhighweldstrength.

简介：摘要：随着国内不断引进国外先进表面贴装设备、我国表面贴装技术自主研发的不断推进，在我国电子制造行业内表面贴装制造工艺已经不是一个高不可攀的工艺难点。然而随着BGA封装器件在表面贴装技术中应用的增多以及大众对于设备小型化、微型化所带来的BGA焊球间距逐步缩小的现状，对表面贴装工艺又带来了新的挑战。从可能影响BGA焊接的各个方面着手，针对性的找出控制对策进行质量管控，从根本上解决问题并提高BGA的焊接可靠性。

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：Ti-23Al-17Nb的机械性质(鼹鼠部分，%)在房间温度的激光横梁焊接合金关节比得上基础材料的。然而，同样焊接的关节的力量和韧性在高温度循环以后严重败坏。微观结构和关节的机械性质上的welded以后热处理的效果被调查。热处理在980oscopy被拿，扫描电子显微镜学和X光检查衍射计。结果显示出Yb增加的0.17%的那增加(集体部分)密度“2519A合金板和还原剂t的粒子吗？

简介：Inthispaperanewmethodforpreventingweldinghotcracking—theinversestrainmethod(ISM)isdevelopedontheprincipleofweldingmechan-ics.EffectivenessandfeasiblityofmethodinpreventingweldinghotcrackingofhighstrengthaluminumalloyLY12CZbysynchronousrollingduringwelding(SRDW)alongbothsidesoftheweldatasuitabledistancebehindtheweldingarcareexamined.ExperimentalresulteindicatethatweldinghotcrackingofLY12CYcanbeeffectivelypreventedandthemechanicalpropertiesofweldedjointcanalsobeimprovedbythemethod.Itisanimportantnewsolutionforpreventinghotcrackinginweldingofsheetmetal.

简介：ButtjointsofQCrO.8/1Cr2lNiSTiequal-thicknessdissimilarmaterialswereobtainedbyelectronbeamweldingwithfixedacceleratingvoltage60kVandfocuscurrent1.99A,changedelectronbeamcurrentandweldingvelocity.MicrostructureandcompositionoftheEBWjointwereinvestigatedbymeansofopticalmicrographyandEDXanalysis,mechanicalpropertiesofthejointwerealsotested.Theresultsshowthatjoint'smacrostructurewasdividedintothreezones:topweldzonenearQCrO.8andbottomweldzoneconsistingofCu(ss.Fe)withacertainamountofdispersedlydistributed(α+ε)mixedmicrostructure,middleweldzoneconsistingof(α+ε)microstracturewithasmallamountofCu(ss.Fe)particles.MorphologicalinhomogeneousmacrostructureandunevenchemicalcompostionofQCrO.8/1Cr21NiSTijointbyEBWarethemostimportantfactortoresultindecreasingjoiningstrength.

简介：摘要：两器是空调的核心部件，其中插小弯头又是两器生产的必要步骤。本文通过对传统插弯头工序进行分析，对两器焊接生产线插弯头技术进行研究，开发了一种自动化插弯头设备，阐述了该设备的工作原理，对其主要的核心技术进行相应的说明。