简介：BondingofAl2O3tocuisperformeddirectlyusingTifoilattemperatureof1273K.Themicrostructureofthejointinterfaceisinuestigatedthroughscanningelectronmicroscope（SEM）,electron.probemicroanalysis（EPMA）andX-raydiffraction（XRD）.theeffectoftheinitialtifoilthicknessonthereactionlayerthicknessandthejointStrengthareinvestigated.

简介：

简介：

简介：本文介绍了低温(-50℃)乙烯球罐制造和焊接技术,制定了球罐制造工艺流程和球壳板成形工艺,通过试验确定了焊接预热温度、层间温度和后热温度,并正确选择了焊接材料。制定了乙烯球罐的焊接工艺规范,并成功地完成了低温(-50℃)乙烯球罐的制造和焊接。

简介：ThispaperintroducesabrazingprocessbetweenAl_2O_3ceramicandInvaralloy.Al_2O_3canbebrazedwithInvareffectively.TheinterfacialstructureofAl_2O_3/Invarjointcanbeexpressedas:Invar/Ag(s,s)+Cu(s,s)+Fe_2Ti(zoneⅠ)/Ag(s,s)+Cu(s,s)+Fe_2Ti+NiTi+Cu_3Ti(zoneⅡ)/Ag(s,s)+Cu(s,s)+Cu_2Ti+Al(s,s)+TiC+TiO(zoneⅢ)/Al_2O_3.Themaximumshearstrengthof139MPawasmeasuredforas-brazedAl_2O_3/Invarjointbrazedat850℃for25minor900℃for15min.

简介：Dynamicsinpartialtransientliquidphasebonding(PTLPbonding)ofSi3N4ceramicwithTi/Cu/Timulti-interlayerwassystematicallystudiedthroughmicro-analysisofjointinterfaces.Theresultsshowthatgrowthofreactionlayerandisothermalsolidificationprocessiondoatthesametime.GrowthofreactionlayerandmovingofisothermalsolidificationinterfaceobeytheparaboliclawgovernedbythediffusionofparticipatingelementsduringthePTLPbonding.Coordinationoftheabovetwodynamicsprocessisdonethroughtimeandtemperature.Whenreactionlayerthicknessissuitableandisothermalsolidificationprocessisfinished,thehighbondingstrengthatroomtemperatureandhightemperatureareobtained.

简介：Anewhardfacingprocess,reactivebrazecoatingprocess(RBCC)wasstudied,and(TiC+Cr3C2)/FecompositecoatingswerepreparedbyRBCCusingcarbon,Cr3C2,iron,ferrochromiumandtitaniumpowderastherawmaterialsinvacuumbrazefurnace.TheresultsshowthatTiCisin-situsynthesizedinthecoatings.ThemethodsofintroducingCr3C2havegreateffectsonthedistributionofTiC.AddingCr3C2directlytotherawmaterialsforcoatings,fineTiCparticlesaggregateintodiscoidsparalleltothecoatingsurface,whereas,in-situsynthesizingCr3C2incoatings,theaggregationsofTiCarelumpish.Duringbrazecoating,Cr3C2particlesdirectlyaddeddissolveandprecipitatetobecomeneedle-shaped.Thecoatingshaveanevenandsmoothsurfaceandarecombinedwiththeirmildsteelsubstratesbyametallurgicalbonding.

简介：本文通过分析异种钢角焊缝裂纹产生的因素，提出改善的措施，采取类角铁的方式改善焊接，阐述了实施过程和操作要领，对解决异种钢角焊缝裂纹提供借鉴经验。

简介：本文所阐述的一种直缝埋弧焊管的焊接导向机构，由支架、可拆卸的导向滚轮和调节手柄组成，既可支撑平衡钢管施焊时的稳定，又可配合各种规格钢管的焊接坡口调换不同的导向滚轮，调节焊道的直线度进行灵活施焊。

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

简介：Fe3AlandCr18-Ni8steelwerebondedinvacuumandaninterfacewasformedbetweenFe3AlandCr18-Ni8steel.Stressdistributionatthediffusion-bondedinterfacewasresearchedbynumericalsimulationandfiniteelementmethod(FEM).TheresultsindicatedthatthepeakstressappearedattheinterfacenearCr18-Ni8steelside.Thisisthekeyfactortoinducecrackatthisposition.Withtheenhancementofheatingtemperature,thepeakstressatthebondedinterfaceincreases.Whenthetemperatureis1100℃,thepeakstressisupto65.9MPa,whichisbiggerthanthatat1000℃by9.4%.Inaddition,thepeakstressbecomesbiggerwiththeincreaseofthethicknessofbasemetalfrom1mmto8mm.Whilethethicknessismorethan8mm,thepeakstressvariesslightlywiththechangeofthethickness.

简介：ThedistributionsoftheaxialstressandshearstressinAl2O3-TiC/Q235diffusionbondedjointswerestudiedusingfiniteelementmethod(FEM).Theeffectofinterlayerthicknessontheaxialstressandshearstresswasalsoinvestigated.Theresultsindicatethatthegradientsoftheaxialstressandshearstressaregreatnearthejointedge.ThemaximalshearstressproducesattheinterfaceoftheAl2O3-TiCandTiinterlayer.WiththeincreaseofCuinterlayerthickness,themagnitudesoftheaxialstressandshearstressfirstdecreaseandthenincrease.Thedistributionoftheaxialstresschangesgreatlywithalittlechangeintheshearstress.TheshearfractureinitiatesattheinterfaceoftheAl2O3-TiC/TiinterlayerwithhighshearstressandthenpropagatestotheAl2O3-TiCside,whichisconsistentwiththestressFEMcalculatingresults.

简介：<正>从3月1日开始,消费者在国内购买电子信息产品的时候,将会看到越来越多的商品上带有一个绿色的"e"标或者一个橙色的数字标志。因为,中国《电子信息产品污染控制管理办法》3月1日起正式实施,1800多种新生产的电子信息产品都必须标有"电子信息产品污染控制标志"。尽管这将增加成本,但不少家电企业表示暂时不会提价。

简介：

简介：精细化多功能智能焊接系统PMFWS-400是一种新型的采用全数字化的斩波式焊接装备，由直流电源供电，可实现手工焊、氩弧焊、脉冲氩弧焊、交直流氩弧焊、氩弧点焊、气保焊、单脉冲气保焊、双脉；中气保焊八种焊接方式，焊接性能达到了国际领先水平。可以实现焊接规范低于250A以下的碳钢薄板、不锈钢、铝及其合金薄板的精细化焊接，尤其适合不锈钢、

简介：为了对高合金异种钢焊接工艺有更多的了解,本文通过对某火力电厂锅炉后屏过热器检修换管过程中涉及到的钢种（SA213-T91马氏体高合金耐热钢与Cr25Ni13奥氏体高合金耐热钢）的现场焊接工艺进行介绍,以给类似工程的施工提供一定的借鉴。

简介：

简介：本文主要介绍了镍基合金的分类、可焊性及焊接工艺特性、焊接方法、焊接材料的选用。焊接时试件表面应严格清理,从合金元素对焊接性能的影响、线能量和层间温度的控制以及焊后热处理方面,对镍基合金材料的焊接有一个详细了解。

简介：

简介：中国是世界公认的制造大国,常常吸引着世界各国的目光,同样世界主要发达国家的经济现状又影响着我国的制造业,特别是在生产资料方面。最近美国的债务危机、欧洲的欧元危机及日本地震海啸带来的暂时性大困忧,都影响着全球生产资料价格的涨跌及走向,靠制造业和出口为主的中国经济,与这些状况有着紧密的关系。作为以钢材铜材为主的电焊机行业更应关注世界生产资料价格的变化,以避免不必要的损失。