简介：Inthispaper,theX-raynondestructivetestmethodofsmalldefectsinprecisionweldmentswithcomplexstructurewaspresented.Toresolvethedifficultyofdefectsegmentationinvariablegreyimage,theimageprocessingbasedonVisualBasicprogrammingmethodwasadopted.ThemethodsofautomaticcontrastandpartialgreystretchwereusedtoenhancetheX-raydetectionimagewhichhasrelativelylowcontrast,thenautomaticthresholdmethodwascarriedouttosegmentthetwohighintensityzones,andweldzoneswhichcontainthesmalldefectswasextracted.Smoothingandsharpenprocessingwereproceededontheextractedweldzones,andsmalldefectsinX-raydetectionimageofweldmentswithcomplexstructureweresegmentedbyusingthemethodofbackgroundsubtractionintheend.Theeffectsofrasterwereeliminated,andbecauseofthattheimageprocessingwasonlyproceededontheextractedweldzones,thecalculatedspeedusingtheaboveprovidedalgorithmwasimproved.

简介：AccordingtospecificationsforWeldingProcedureQualificationofASMEIXSectionandChinesecode,JB4708-2000,asoftwarepackageformanagingweldingdocumentshasbeenrebuilt.Consequently,thenewsoftwarepackagecanbeusedinaLimitedAreaNetwork(LAN)with4differentlevelsofauthoritiesfordifferentusers.Therefore,theweldingdocuments,includingDWPS(DesignforWeldingProcedureSpecifications),PQRs(ProcedureQualificationRecords)andWPS(WeldingProcedureSpecifications)canbesharedwithinacompany.Atthesametime,thesystemprovidesusersvariousfunctionssuchasbrowsing,copying,editing,searchingandprintingrecords,andhelpsuserstomakedecisionofwhetheranewPQRtestisnecessaryornotaccordingtothecodesaboveaswell.Furthermore,superuserscanalsobrowsethehistoryofrecordmodificationandretrievetherecordswhenneeded.

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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：Themicrostructureandmechanicalpropertiesofsteel/Alstructurematerialproducedbyadditivemanufacturing(AM)wasinvestigatedinthisworkbasedonthecoldmetaltransferwelding.Theresultsshowthatthemicrostructuregraduallychangedfromthesteelsidetothealuminumside.Themicrostructureinthesteellayerconsistedofvermiformlike8ferriteandaustenitestructure,whileinthealuminumlayerthemicrostructurewasconstitutedbyα-AlgrainsandtypicalreticulatedistributiveAl-Sieutecticstructure.Besides,a7μmthicknessNi-Alintermetalliccompoundlayerwasemergedattheinterfaceofnickelandaluminumlayer.Themaximumroom-temperaturetensilestrengthoftheSteel-Alstructurematerialswasfoundtobe54MPa,therupturemorphologyshowedabrittlefracturecharacteristic.

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简介：Thepapergivesananalysisontechnicalcharacteristicsofrepairtechniquesforfrictionstirweldingdefects.Toovercomethedefects,anewrepairtechnique,inertiafrictionpullplugwelding(IFPPW),wasresearchedanditsequipmentwasdevelopedaswell.ElementarydatumwasachievedbyinvestigatingtheinfluencesoftechnologicalparametersonmechanicalpropertiesandbyanalyzingthestructuralcharacteristicsofrepairjointwithIFPPW.ThestudyshowsthatthestabilityandreliabilityofweldingprocessofIFPPWcanbeguaranteedthroughtheconstantenergyfromtheflywheel.Integratedwiththeadvantagesoffrictionpullplugwelding,theIFPPW,freefrombackanvil,isconsideredasapromisingtechniqueinrepairofterminationkeyholeofbobbintoolfrictionstirweldingandpoint-likedefectsinaluminumalloywelding.

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