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WeldingTechnologyVo1.38No.5May2009?英文标题,摘要及关键词?I

    ;MAINTOPICS,ABSTRACTS&KEYWORDS

    ;Researchadvancementofhightemperaturelead?freeelectronicpackaging

    ;MALiang.YINLimeng.X1ANJianwei,eta1.

    ;(SchoolofMaterialsScienceandEngineering,SouthChinaUniversityofTechnology,Guangzhou510640,Guangdongpm.,China)P6-10

    ;Abstract:Therapiddevelopmentoflead-freeelectronicpackagingtechnologyintheworldhasposedagreatchallengetosomehighlead

    ;containingsolderswhichwastemporarilyexemptedfromRollS.Thus,itwasimperativetoseeksuitablelead-freeinterconnectionmaterials

    ;anddevelopnewlead-freepackagingtechnology.Thispaperintroducedtwokindsofnewlead-freepackagingtechnologies,i.e.,silver

    ;powdersinteringandsolid-liquiddiffusion,andofferedareviewontheresearchofseveralpotentialhightemperatureleadfreesolders

    ;whichincludedZnandBiAgbasedsolders,Bi-basedcompositesoldersandAu-basedsolders.Finally,thedevelopmentBendofhigh

    ;temperaturelead-freesoldersandlead-freepackagingtechnologywerediscussed. ;Keywords:electronicpackaging,highleadcontainingsolder,leadfreeinterconnectiontechnolog

    y,hightemperaturelead?freesolder,

    ;revJew

    ;Simulationofmaincircuitoftheshearing-flashbuttweldingpowersupplyanddesignofthecontrolsystem

    ;WANGHong-wen,XINGJiugaoandWANGYong-wei

    ;(SchoolofElectricalEngineeringandAutomation,HebeiUniversityofTechnology,Tianjin300130,China)P11-13

    ;Abstract:Designanddevelopmentoffulldigitalshearing-flashbuttweldingpowersupplywereintro

    ducedinthispaper.Simulationof

    ;maincircuitsofpowersupplywasconcretelydiscussed.DigitalsynchronousandPWMtriggercircuit,protectandsamplingcircuitof

    ;voltageandcurrentweredesigned.Furthermore,fulldigitalcontrolthoughtofshearing?flashbuttwel

    dingpowersupplywasadvanced.

    ;Digital,informatizationandflexibleplatformwasestablished.Theexperimentresultsshowedthatthepowersupplycouldsatisfythe

    ;technologicalrequirementsofweldingpowersupplyandrealizethefulldigitalcontrolofshearing?fla

    shbuttweldingpowersupply.

    ;Keywords:full-digital,DSP,shearingflashbuttweldingpowersupply,simulationofmaincircuits,co

    ntrolsystem

    ;ResearchonMIGweldingarcwitIladditionallongitudinalalternatingmagneticfield ;CHANGYunlong,SHA0Li-guang,LIDuo,eta1.

    ;(SchoolofMaterialScienceandEngineering,ShenyangUniversityofTechnology,Shenyang110023,Liaoningpro.,China)P14l6

    ;Abstract:AhighspeedvideocamerawasusedtoacquireMIGweldingarcshapewithadditionallongitudinalalternatingmagneticfield.

    ;Varietyofarcshapeofweldingwasresearched.Ahigh?speedvideocamerashowedthattheMIGweldingarcshapeclockwiseandcounter

    ;clockwisemovedalongtheweldingwireaxsiswitIladditionallongitudinalalternatingmagneticfield.Whenmagneticfrequencywas

    ;constant,themorethemagneticcurrentwasincreased,thebiggerthearcshapewasandthedarkerthearcwas.Whenmagneticcurrent

    ;wasconstant,themorethemagneticfrequencywasincreased,themorethearcshaperotatingfrequencywas.Theresultalsoshowedthat

    ;thedropletshapewasalternationwithlongitudinalalternatingmagneticfield.Thearcshapewasalsochangedwiththisdropletshape.When

    ;themagneticcurrentwaschangedfrom0.5Ato0.8A,increasingmagneticcurrent,theweldingcurrenthadaheavilyattenuation;when

    ;themagneticcurrentwasfrom0.8Ato1.5A,increasingmagneticcurrent,theweldingcurrenthadagradualattenuation.

    ;Keywords:longitudinalalternatingmagneticfield,MIGwelding,high-speedvideocamera,rotatingarc ;|

    ;??英文标题,摘要及关键词?焊接技术第38卷第520095

    ;WeldingofthebigdiameterX80pipeinlowtemperatureenvironmentof20?

    ;YlNZhang-hua.YANGWu-tang

    ;(1.PipelineResearchInstituteofCPP,Langfang065000,Hebeipro.,China;2.The4PipelineEngeneeringCompanyofCPP.

    ;Langfang065000,Hebeipro.,China)P19-23

    ;Abstract:TheweldabilityofX80wasanalyzedindetailinthispaper,andtwofeasibleweldingtestswerecarriedunderlowtemperature

    ;environmentof

    20oC.Accordingtotheresultofthemechanicaltest,metalographicandhardnesstests,twofeasibleweldingprocedures

    ;andrelevantweldingparameterandtechniquemessagewereprovidedinthispaper. ;Keywords:-20?,lowtemperatureenvironment,X80,pipe,welding

    ;DetectandanalysissystemforshortcircuittransferbasedonLabview

    ;WANGHuixia,WANGJun,HUYun-yan,eta1.

    ;(CollegeofMaterialScienceandEngineering,HebeiUniversityofScienceandTechnology,Shijiazhuang050054,Hebeipro.,China)

    ;P32-36

    ;Abstract:AsthesignalsoftheweldingcurrentandvoltageoftheCO2gasshieldedarcwelding,thisvirtualinstrumentwasdeveloped

    ;basedonLabVIEWwhichcoulddetectandanalyzethesignalsofthecurrentandvoltageoftheCO2gasshieldshort-circuitingtransfer.Not

    ;onlycoulditanalyzethesignalsoftheweldingcurrentandvoltageoftheC02gasshieldedarcwelding,butalsocouldtheapplicationof

    ;thissystemevaluatethearcweldingprocesseffecfly.Analysisofthesignalsintheprocessofmetaltransferwereofgreatsignificancefor

    ;selectionofappropriateweldingparameters,improvementofcontrolsystemandthehighqualityweld

    ing.

    ;Keywords:virtualinstrument,CO2gasshieldedarcwelding,short-circuitingtransfer,dataacquisition,dataanalysis

    ;Developmentofdetectingsystemforblowholeinsteelpipeweld

    ;GA0Weixin,LILin,MUXiang-yang,eta1.

    ;(CollegeofElectricalEngineering,Xi’anShiyouUniversity,Xi’an710065,Shaanxipro.,China)P37-4

    0

    ;Abstract:Thequalityofweldwasdetectedbyanimage-processingalgorithm.Inthepresentedalgorithm,Sobeloperatorwasthefirst

    ;usedtodecidethepositionofweld.Byexperiments,itwasfoundthatthegrayvalueinthepositionofblowholewaslargerthanthegray

    ;valueinthepositionofweldatleast5.So,byexaminingwhetherthereexistedaregionwhosegrayvaluewaslargerthanthegrayvalueof

    ;otherpartsofweldatleast5,thealgorithmcoulddetectblowholeintheweld.Basedonthealgorithm,anblowholedetectingsystemwas

    ;realized.Themultithreadingtechnologywhichcouldincreasevaliditywasusedinthesystem.Applicationresultsshowedthatthis

    ;algorithmanddetectingsystemwerefeasibleandeffective.

    ;Keywords:weld,blowhole,detecting,multithreading

    ;Weldingqualitycontroloftheprimarylooppipeinthe1000MWnuclearreactor

    ;TANGShun-yi

    ;(WeldingEngineeringCompany,GuangdongPowerEngineeringCorporation,Guangzhou510730,Guangdongpro.,China)P49-52

    ;Abstract:Inthenuclearpowerstationconstruction,thekeyoftheerectionworksofnuclearpowerstationwastheweldingofthenuclear

    ;reactorprimaryloopmadeofausteniticstainlesssteelpipewithbigdiameterandthickwal1.Theweldingqualityplayedanimportantrole

    ;inthequalitycontrolofthenuclearpowerstationconstruction.Theweldingqualitycontroloftheprimarylooppipeinthe3unitofLingao

    ;nuclearpowerstation-I1wasintroducedinthispaper.Expecttouseforreferenceforweldingqualitycontrolofprimarylooppipeinthe

    ;nuclearreactorpilehereafter.

    ;Keywords:nuclearpowerstation,primaryloopinnuclearreactorpile,austeniticstainlesssteel,bigdiameterandthickwallpipe,

    ;weldingqualitycontrol

    ;

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