简介：Anewtypecontrolmethodinfrictionweldingissuggestedinthispa-per,thatiscompositivecontrolmethodoffrictiontorqueandfrictiontime,itcalledMtcontrolmethodforshort.TheprincipleofMtcontrolmethodanditsfeatureareconciselyexplained.

简介：

简介：Inthispaperanewmethodforpreventingweldinghotcracking—theinversestrainmethod(ISM)isdevelopedontheprincipleofweldingmechan-ics.EffectivenessandfeasiblityofmethodinpreventingweldinghotcrackingofhighstrengthaluminumalloyLY12CZbysynchronousrollingduringwelding(SRDW)alongbothsidesoftheweldatasuitabledistancebehindtheweldingarcareexamined.ExperimentalresulteindicatethatweldinghotcrackingofLY12CYcanbeeffectivelypreventedandthemechanicalpropertiesofweldedjointcanalsobeimprovedbythemethod.Itisanimportantnewsolutionforpreventinghotcrackinginweldingofsheetmetal.

简介：Usingsteppatternmatchtechnologywithvariationalresolutioncanrecognizethepositionandorientationoftheweldseamintheimage.Accordingtousingtheimagesegmentationmethodbasedonpatternmatch,notonlyadvancedthespeedandanti-jammingcapability,butalsocapturedtheedgeinformationoftheweldseamandtheedgeoftheworkpiece,andtheimagecoordinateoftheinitialweldingpositioncanbeobtained.Thematrixforhand-eyerelationshipoftherobotcanbecalculatedbyadoptingtherapidcalculationmethod.Accordingtothedepthcalculatingprinciplewiththespecialpointmatchingusingbinocularstereovision,theinitialweldingpositioncanbeconfirmedbycalculatingthemiddlepointoftheperpendicularlineoftworadialsinthespace,andthefunctiontoguidetheweldingrobottotheinitialweldingpositioncanberealized.

简介：

简介：Computervisionhascomeintousedinthefieldsofweldingprocesscontrolandautomation.Inordertoimproveprecisionandrapidityofweldingimageprocessing,anovelmethodbasedonfractaltheoryhasbeenputforwardinthispaper.Comparedwithtraditionalmethods,theimageispreliminarilyprocessedinthemacroscopicregionsthenthoroughlyanalyzedinthemicroscopicregionsinthenewmethod.Withwhich,animageisdivideduptosomeregionsaccordingtothedifferentfractalcharactersofimageedge,andthefuzzyregionsincludingimageedgesaredetectedout,thenimageedgesareidentifiedwithSobeloperatorandcurvedbyLSM(LeaseSquareMethod).Sincethedatatobeprocessedhavebeendecreasedandthenoiseofimagehasbeenreduced,ithasbeentestifiedthroughexperimentsthatedgesofweldseamorweldpoolcouldberecognizedcorrectlyandquickly.

简介：

简介：ＭｅｃｈａｎｉｃａｌｓｔｒｅｎｇｔｈａｎａｌｙｓｉｓｏｆＳＭＴｓｏｌｄｅｒｊｏｉｎｔｓｂｙｆｉｎｉｔｅｅｌｅｍｅｎｔｍｅｔｈｏｄ￥ＷＡＮＧＣｈｕｎｑｉｎｇ；ＷＡＮＧＲｕｉｊｕｎ；ＳＡＮＧＹａｎａｎｄＱＩＡＮＹｉｙｕ（ＷｅｌｄｉｎｇＤｅｐａｒｔｍｅｎｔ...

简介：

简介：

简介：

简介：

简介：Obtainingtheimageofmoltenpoolaluminumalloy'stungsteninertgas(TIG)weldingbecomesachallengingproblemintheweldingfield.Inthispaper,abran-newopticalsensorbasedanalyzingthelightspectrumwasdesigned,andtheclearimageofthemoltenpoolduringthealuminumalloy'sweldingusingthecommonindustrialCCDcamerawasobtained.Andwiththenewalgorithmprovidedbymyself,thedesirablecharacteristicparametersofthemoltenpoolofaluminumalloy'sweldingwereobtained,anditprovidesagoodbaseforadvancedmonitorweldingquality.

简介：

简介：Nickel-irontypecastironelectrodesarewidelyusedforweldingQT600-3nodulariron.Nevertheless,theresearchworkhasdemonstratedthatthestrengthoftheseheterogeneousweldedjointsislow.Inthispaper,theuni-axialtensionofthejointsisstudiedbytheMoirefringemethod,andthedis-placement,strainandstressinthetotalfieldsareobtaind.Basedontheunevendistributionofstrainandstress,thereasonofcrackinitiationandpropagationisdiscussed.Throughexaminingtheappearanceofthefracturebyscanningelec-tronmicroscope,alotofsphericalsubstancesdistributedonthefracturesurfacearefound,whichmaybeanotherreasonleadingtocrackingoftheweldedjointunderthelowertensilestress.Thesenewfindingswillhelptoimprovethepropertiesofnickel-irontypecastironelectrodesandthestrengthoftheweldedjoint.

简介：

简介：Consideringthelimitationofcomputationalcapacity,anewfiniteelementsolutionisusedtosimulatetheweldingdeformationofthesidesillofrailroadcar'sbogieframebasedonthelocal-globalmethod.Firstly,avolumetricheatsourcedefinedbyadoubleellipsoidisadoptedtosimulatethethermaldistributionsofthearcweldingprocess.Andthen,thelocalmodelsextractedfromtheglobalmodelarecomputedwithrefinedmeshes.Onthesebases,theglobaldistortionsofthesubjectstudiedareascertainedbytransferringtheinnerforcesofcomputedlocalmodelstotheglobalmodel.Itindicatesthatthelocal-globalmethodisfeasibleforsimulatingthelargeweldedstructuresbycomparingthecomputedresultswiththecorrespondingactualmeasuredvalues.Theworkprovidesbasisforoptimizingtheweldingsequenceandclampingconditions,andhastheoreticalvaluesandengineeringsignificanceintheintegraldesign,manufacturingtechniqueselectionofthebogieframe,aswellasotherkindsoflargeweldedstructures.

简介：Whenmeasuringresidualstressofcoarse-grainaluminumalloyusingX-raydiffractionmethod,thediffractionprofileshowstwopeaksandpositionofmeasured2dwillbechanged,whichleadtoaninaccuratemeasurementresult.Hence,inthispaper,somemethodswereemployedtoimprovethemeasurementaccuracy.Duringthemeasuringprocess,differentparameters(diameterofirradiatedarea,Ψ-oscillationrangeandexposuretime)wereselectedandprofilepeakshiftmethodwasutilized.Moreover,whenthe20ofprofileswasdetermined,differentcalculationmethodswereusedtocalculatetheresidualstress.TheresultsshowthatdiameterofirradiatedareaandΨ-oscillationrangehavesignificantinfluenceonthemeasuringresult.Forstressvaluecalculateddirectlyfromthetestequipment,crosscorrelationmethodismoreaccuratethantheabsolutepeak.Furthermore,anothertwocalculationmethodsofslopewith2θ-sin~2Ψande-sin~2Ψwereusedtocalculatethestressbasedonparameters(2θ,ε)obtainedfromcrosscorrelationmethod.Itisconcludedthat20-sin~2Ψmethodcanfurtherimprovethemeasurementaccuracy.

简介：

简介：Thispaperintroducedthebasictheoryandalgorithmofthesurrogatedatamethod,whichproposedarigorouswaytodetecttherandomandseeminglystochasticcharacteristicsinasystem.TheGaussiandataandtheRosslerdatawereusedtoshowtheavailabilityandeffectivityofthismethod.Accordingtotheanalysisbythismethodbasedontheshort-circuitingcurrentsignalsundertheconditionsofthesamevoltageanddifferentwirefeedspeeds,itisdemonstratedthattheelectricalsignalstimeseriesexhibitapparentlyrandomnesswhentheweldingparametersdonotmatch.However,theelectricalsignalstimeseriesaredeterministicwhenamatchisfound.Thestabilityofshort-circuitingtransferprocesscouldbejudgedexactlybythemethodofsurrogatedata.