简介：压力容器是典型的焊接结构，保证压力容器产品质量的关键是焊工技术水平的高低，而提高焊工这方面素质的唯一途径，就是进入有资质的焊接培训中心进行全方位的培训，为此本文介绍的培训中模拟压力容器焊接制作是非常重要的。

简介：1焊条、焊丝、焊剂GB／T5117—1995碳钢焊条GB／1-5118—1995低合金钢焊条GB／T983—1995不锈钢焊条

简介：<正>2009年12月1～3日,2009年第三届中国(上海)国际压力容器、压力管道及技术设备展览会在上海世贸商城举办。本次展会涵盖了压力容器、热处理设备、不锈钢、机械制造以及焊接气瓶制造商,吸引了众多终端用户前来观看和洽谈。

简介：Bead-on-plateCO2laserweldingof1000MPagradetransformationinducedplasticity(TRIP)steelwasconductedunderdifferentweldingpowers,weldingspeedsandshieldgases.Themacrostructuralandmicrostructuralfeaturesoftheweldedjointwereinvestigated.Theincreaseofweldingspeedreducedthewidthoftheweldbeadandtheporositiesintheweldbeadresultingfromthedifferentflowmodeofmeltedmetalinweldpool.ThedecreaseofweldingpoweroruseofshieldgasofheliumalsocontributedtothereductionofporosityinBead-on-plateCO2laserweldingof1000MPagradetransformationinducedplasticity(TRIP)steelwasconductedunderdifferentweldingpowers,weldingspeedsandshieldgases.Themacrostructuralandmicrostructuralfeaturesoftheweldedjointwereinvestigated.Theincreaseofweldingspeedreducedthewidthoftheweldbeadandtheporositiesintheweldbeadresultingfromthedifferentflowmodeofmeltedmetalinweldpool.Thedecreaseofweldingpoweroruseofshieldgasofheliumalsocontributedtothereductionofporosityintheweldbeadduetothealleviationofinducedplasmaformation,thusstabilizingthekeyhole.TheporosityformationintimatelycorrelatedwiththeevaporationofalloyelementMninthebasemetal.Thelaserweldedmetalhadsamemartensitemicrostructureasthatofwater-quenchedbasemetal.Theweldingparameterswhichincreasedcoolingrateallledtofinemicrostructuresoftheweldbead.

简介：ThemicrostructureandhardnessoftheHAZina800MPagradeultra-low-carbonmicroalloyedsteelwerestudied.Theresultsindicatethattheheataffectedzone(HAZ)oftheRPC(Relaxation-Precipitation-Controlling)steelpossessesacontinuousgradientstructure,andcanbeclassifiedintothreezones,i.e.CGHAZ(coarse-grainHAZ),FGHAZ(fine-grainHAZ)andICHAZ(intercriticaltemperatureHAZ).ThemicrostructuresintheHAZareallcomposedofbainite-likestructure.ThemicrostructareintheCGHAZmainlyconsistsoflath-likebainiteandgranularbainite.Theinfluencesofheatinputandt8/5onthehardnessintheHAZofRPCsteelarenotable.Withtheincreaseofheatinputandt8/5,thesofteningtendencyofHAZbecomesobvious.ThehardeningphenomenonthatnormallyoccursintheCGHAZdoesnottakeplacewiththissteelintherangeofexperimentalconditions.ThesofteningintheICHAZisboundtooccur.Henceappropriateweldingtechnologiesneedtobeselected.

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简介：Theeffectsoftwopost-weldheattreatmentprocessesonthemicrostructureandfatiguepropertiesoftheelectronbeamweldedjointsof30CrMnSiNi2Asteelwerestudied.Electronbeamlocalpost-weldheattreatment(EBLPWHT),inavacuumchamber,immediatelyafterweldingandatraditionalfurnacewholepost-weldheattreatment(FWPWHT)wereaccepted.Theexperimentalresultsshowthat,afterEBLPWHT,themainmicrostructureofweldischangedfromcoarseacicularmartensiteintolathmartensite,andbasemetalischangedfromferriteandperliteintoupperbainiteandresidualaustenite,howeverthemicrostructuresofdifferentzonesofjointsinFWPWHTconditionsaretemperedsorbite.Thefatiguecrackgrowthrateda/dNofweldsandbasemetalarenotobviouslychangedamongEBLPWHT,FWPWHTtestandas-welded(AW)test,asthemechanicalpropertiesofmaterialshaveacertainbutnotlargeeffectontheda/dNofweldedjoints.TheresistancetonearthresholdfatiguecrackgrowthdataofweldedjointscanbelargelyimprovedbyEBLPWHTanditisrelatedtomicrostructureandcrackclosureeffect.

简介：本文介绍了CO2焊工艺方法及其高效、优质、低成本的综合优越性以及在石油、化工、天然气工程建设中的应用与发展,不同种类的气体与焊丝相组合的工艺特点及控制焊缝成形的操作技术。

简介：在当今高节奏、强竞争的社会，人们常说“做人难，做成功人士更难，成为名人更是难上难”。同理，用此话来感叹企业的生存与发展，亦有异曲同工之妙。因为，企业经营何尝不是如此？

简介：Inthispaper,themicrostructureandhardnessofHG980Dheat-affectedzone(HAZ)atdifferentcoolingratet8/3werestudied,theimplantcriticalfracturestressunderthreediffusiblehydrogenconditionsweremeasured,andthehydrogen-inducedcracking(HIC)fractographofsteelHG980Dwereanalyzed.TheexperimentalresultsshowthatmartensiteexistsinHAZofHG980Dtillt8/3≥150s,thehardenquenchingtendencyofHG980Disgreater;Theimplantcriticalfracturestressisrelatedtodiffusiblehydrogencontentsignificantly,atlowhydrogenlevel,highrestraintstressisneededtonucleateHIC,thefractographismainlymicrovoidcoalescence,butathighhydrogenlevel,onlysmallrestraintstresscancauseHICoccurrence,thefractographismainlyquasicleavage.Itisveryimportanttochooseultra-lowhydrogenweldingconsumabletoweldsteelHG980Dtopreventhydrogen-inducedcracking.

简介：Theultra-finegrain(UFG)steelisweldedbyusingresistancespotweldingtechniquewithorwithoutrequirementofupsettingforce.Metallographicinspectionshowsthatthegrainsizeofweldnuggetislargerthanthatofthebasemetalandthemicrostructureisalteredsignificantly.Inaddition,contractingdefectssuchasairholescanbefoundinthenuggetcenter.Theexperimentsshowthatthedefectscanbeeffectivelyavoidedbythetechniqueofaddingupsettingforceduringthenuggetcoolingandcrystallizingprocesses.Intensilesheartests,theweldingjointstartstocrackfromtheinneredgeofthecoronabond.Theresultsofmicro-hardnesstestsshowthatthenewlybornmartensitestructuredramaticallyimprovesthehardnessofthejoint.Undertheinteractionsbetweenresidualstressesandregeneratedfinegrains,themicro-hardnessoftheheat-affectedzone(HAZ)islowerthanthatofthenugget,butevidentlyhigherthanthatofthebasemetal.

简介：1电渣焊的特点电渣焊具有焊接效率高；焊缝金属纯净度高；焊前准备工作简单；焊接过程无弧光；焊接热循环独特；焊接参数调节范围宽等特点。

简介：本文介绍了CO2气体保护电弧焊的冶金特点，CO2气体保护电弧焊焊接过程中的熔滴过渡形式；从焊丝的冶金过程，焊接时的工艺参数的选择及调整等方面探讨了汽车白车身CO2焊接质量的控制。

简介：本文简介30CrMnSiA的材料特点，并对该材料焊接工艺评定作了详细叙述，拟定了合理的焊接工艺，在产品制造中得到了广泛应用，为公司创造了良好的经济效益。

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简介：CO2气体保护焊具有效率高、成本低、应用范围广等优点,且随着CO2焊接设备、焊接材料和焊接工艺的研究发展,使CO2气体保护焊在矿用汽车工业中获得广泛应用。

简介：导电件的加工技术难度一直是提高生产合格率的严重障碍。本文从"劈铆"、"焊接"两个环节入手,采取了一系列措施,使零件垂直度、平面度、光洁度都得到了保证,特剐是零件外观质量得到了很大改观,生产合格率得到很大提高。

简介：Electro-sparkdepositionhasbeencarriedoutonthe35CrMosteelbyfillingandrestoringthesimulatedslotspecimens,andcontinuoussurfacecoatingwithextralowporositywasobtainedwithproperparameters.Themicrostructuretransformationandinterfacebehaviorofdepositedjointwereobservedandanalyzed.Itshowsthatatransitionregionwith15μmindepthwasobtainedbetweenbasemetalanddepositedmetal,andmetallurgicalbondingwasachievedbetweenrestoredbasemetalanddepositioncoating.

简介：中国铁路总公司4月30日召开电话会议，再度调整今年的铁路固定资产投资计划，将今年铁路投资总额上调至8，000亿元人民币．仅次于2010年8426．52亿元的历史顶点。新项目从年初计划的44个飙升至64个，今年新投入运营的线路要确保达到7000公里以上，