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简介：Thearcsprayingprocessisdividedintotwostages:thefirststageisatomization-sprayingstream(ASS)andthesecondoneissprayingdeposition(SD).Thenstudystatusisdescribedofbothstages'physicalmodelandcorrespondingcontrolling-equation.Basedontheanalysisofstudystatus,theconclusionasfollowsisgot.TheheatandmasstransfermodelswithtwoorthreedimensionsinASSstageshouldbeestablishedtofardeeplyanalysesthedynamicalandthermalbehavioroftheoverheatdroplet.Thestatisticslawofoverheateddropletsshouldbefurtherstudiedbyconnectingsimulationwithexperiments.MorepropervalidationexperimentsshouldbedesignedforflatteningsimulationtomodifythemodelsinSDstage.

简介：AprototypeofPulsedPlasmaArcCladdingsystemwasdeveloped,inwhichsinglepowersourcesuppliesbothtransferredplasmaarc(TPA)andnon-transferredplasmaarc(N-TPA).BothplasmasworkinturninahighfrequencycontrolledbyanIGBTconnectingnozzleandworkpiece.TheworkingfrequencyofIGBTrangesfrom50～7000Hz,inwhichtheplasmascanworkinturnsmoothly.Higherthan500HzofworkingfrequencyissuggestedforpromotionofcladdingqualityandprotectionofIGBT.DragphenomenonofTPAintensifiesasthefrequencygoesup,whichtendstoincreasethecurrentproportionofTPAandsuppressN-TPA.TheoccupationratioofIGBTcanberegulatedfrom5%～95%,whichbalancesthepowersuppliesofbothplasmas.Anoccupationratiohigherthan50%givesadequateproportionofarccurrentforN-TPAtopreheatpowder.

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简介：Aspectraldiagnosticsofcomplexareplasmausingmultiplespectralinformationofareself-emittingispro-posed.Thismethodisabletosimultaneouslydeterminecomponentdensities,thecorrespondingtemperatureandtheirdis-tributionsbyafewlineintensitiesmeasurent.Theprincipleofthemethodandtherelevantmeasuringsystemarede-scribed.Anequationsystemisestablishedforcomputationofthestatevariablesinareplasma.Anexperimentunderweldingareconditionismadeasanapplicationofthemethod.Theeffectsofprobableerrorsourcesonthemeasurementarealsoanalysed.

简介：Thevariationinarccharacteristicsandbehaviorofmetaltransferwiththechangeinpulseparametershasbeenstudiedbyhighspeedvideocameraduringpulsecurrentflux-coredarcwelddeposition.Acomparativestudyofsimilarnaturehasalsobeencarriedoutduringflux-coredarcwelddepositioninglobularandspraytransfermodes.Theeffectofpulseparametershasbeenstudiedbyconsideringtheirmeancurrentandarcvoltage.Thearccharacteristicsstudiedbyitsrootdiameter,projecteddiameterandlength,andthebehaviorofmetaltransfernotedbythemetaltransfermodelandthedropletdiameterhavebeenfoundtovarysignificantlywiththepulseparameters.TheobservationmayhelpinunderstandingthearccharacteristicswithrespecttothevariationinpulseparameterswhichmaybebeneficialinusingpulsecurrentFCAWtoproducedesiredweldquality.

简介：Manyapplicationsofultrasonic-assistedmethodswereusedduringmetalsolidification,buttheycouldnotbeintroducedintoweldpool.Inthispaper,awayofultrasonicassistedTIGweldingisintroduced.Bydirectlyimposedultrasonicvibrationonweldingarc,thevibrationinteractswitharcplasmaandpassestotheweldpool.Measurementresultsshowthatarcpressureissignificantlyincreasedwiththeultrasonicvibrationandthearcpressuredistributionmodelsarechanged.Bead-on-plateweldingtestsonSUS304confirmthatthistechnologycaninfluencethestyleofmetalmeltingandincreaseweldpenetrationdepth.

简介：Thekeyproblemfornumericalsimulationofplasmaarcwelding(PAW)processistodevelopasuitableandadaptivevolumetricheatsourcemodewhichreflectsthephysicalcharacteristicsofkeyholePAW.Tothisend,thekeyholegeometryunderdifferentPAWprocessconditionsmustbepredicted.Inthispaper,amathematicalmodelfordeterminingthekeyholeshapeisdevelopedwithconsideringthemassandmomentumconservationofthein-keyholeplasmajetaswellasthepressureequilibriumattheplasmajet/liquidmetalboundary.AsuitableheatsourcemodelrelatedtothekeyholeshapeisappliedtothecalculationofPAWwelddimensions.Thepredictedresultsareingoodagreementwiththeexperimentalones.

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简介：Throughtheinvestigationontraditionalarcstudweldingprocess,anewweldinggunanditscontrolsystemweredevelopedinthispaper.Thesteppingarcstudweldinggunwasmainlymadebyasteppingmotorasactuatingunitandascrew-drivendeviceasmovingunit.AcontrolsystemwithaMCS-51single-chipmicrocomputerasmaincontrolcomponentwasusedtorealizethenewstudweldingprocedure.Thisnewweldingprocesswithsteppingstudweldinggunisnamedassteppingarcstudwelding.Inthenewweldingprocess,thestudactioncanbelookedasconstitutedbysomemicrosteps.Thesettingandadjustingofthesteppingarcweldinggunbehaviorparametersareaccomplishedindependently.Itisindicatedfromtheresultsofprocesstestsandbendingtestthatthesteppingarcstudweldingprocessispracticable.

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简介：Imagesensorhasbeenoneofthekeytechnologiesinintellectualizedroboticswelding.Edgedetectionplaysanimportantrolewhenthevisiontechnologyisappliedinintellectualizedweldingroboticstechnologies.Thereareallkindsofnoisesinweldingenvironment.Thealgorithmsincommonusecannotbeappliedtotherecognitionofweldingenvironmentdirectly.Theedgeofimagescanbefellintofourtypes.Theweldimagesareclassifiedbythecharacteristicofweldingenvironmentinthispaper.Thispaperanalyzessomealgorithmsofedgedetectionaccordingtothecharacterofweldingimage,somerelativeadvantagesanddisadvantagesarepointedoutwhenthesealgorithmsareusedinthisfield,andsomesuggestionsaregiven.Thefeatureextractionofweldseamandweldpoolaretwotypicalproblemsintherealizationofintellectualizedwelding.Theiredgefeaturesareextractedandtheresultsshowtheapplicabilityofdifferentedgedetectors.Thetradeoffbetweenprecisionandcalculatedtimeisalsoconsideredfordifferentapplication.

简介：ElectrodeENiFe-Cland￡"4303wereselectedtojointhecementedcarbideWC-2QCoandcarbonsteel45byshieldedmetalarcweldingprocess.Microstructureandbendingpropertyofthecorrespondingjointswereanalyzed.Theresultsshowedthatthecarbonsteelelectrode￡"4303hadnopropermetallurgyconditionforthearcweldingofcementedcarbideandcarbonsteel.TheCandNicontentofthecastironelectrodeENiFe-Clcouldmeettheconditionofpreventingtheformationof7]carbide,whichwassuittothearcweldingofcementedcarbideandcarbonsteel,buttheoperationparametersneededtobeoptimizedtominimizetheslaginclusion.ThealloyWC-2QCowhichdidnotfitforcoldarcwelding,byadoptingthemeasureofbeingpreheatedat723K/or1hbeforewelding,andbeingkeptat723Kfor3hafterweldingthenfollowedfurnacecoolingcouldavoidthehappeningofcrackintheWC-20C〇basemetal.

简介：Theinfraredcameraisusedtoinvestigatethetemperaturefieldofgasmetalarcwelding.Theresultsshowthatthetemperaturedistributionofweldpoolandadjacentareaappearsconeshape.AnewheatsourcemodelcombinedbyGaussiandistributionheatsourceofthearcandconicaldistributionheatsourceofthedropletissetupbasedontheexperimentalresults,andwiththecombinedboundaryconditions,thetemperaturefieldofgasmetalarcweldingissimulatedusingfiniteelementmethod.AccordingtothecomparisonbetweentheresultsofexperimentandsimulationintemperaturefieldshowsthatthenewcombinedheatsourcemodelismoreaccurateandeffectivethantheGaussheatsourcemodel.

简介：Thetenacityofheat-affectedzone(HAZ)willdeclineandthesizeofgrainswillincrease,becauseoftheoverheatingonHAZwhensubmergedarcwelding(SAW)isusedtothickplatewithhighheatinput.TheshapingwillworsenwhenSAWisusedtothinplatewithhighcurrentathighspeed.AnewSAWtechnology,thepulseddirectcurrent(DC)automaticSAW,willbeputforwardinthispaperinordertoovercometheaboveshortcomings.Andapulsedcontrollerwithmicro-controllerunit(MCU)asthecore,nixietube(NT)andkeyboardastheman-machineconversationinterfaceisdeveloped.Themainfunctionsofthepulsedcontrollerincludetheoutputofpulsedweldingcurrentandtheworkingwithtwinwire.Theresearchhaswidelyprospectsinapplicationwithsignificantmeaningsintheoryandpracticalengineering.

简介：stabilityofweldingprocessistheprerequisiteandassuranceforidealjoint.Thestructureofstabilitymodelanditsoptimizationarethekeytoon-lineevaluationtechnologyofarcwelding.Characteristicparametersareextractedfromthesingletransferperiodwhilevariationcoefficientsofthecharacteristicparametersareconcernedforwholeweldingprocessofcontinuousdroptransfer.Basedonthecharacteristicparametersandtheirvariationcoefficients,stabilitymodelofshort-circuitarcweldingprocessisestablishedbypartial-least-squareregression(PLSR)thatcanovercomemulticollinearityofinputparameters.Theexperimentresultsshowthatthismodelcanmeettherequirementofaccuracy.