厚板多层多道焊角变形分析方法

,,(,100083):,,,,,,VV:;;;:TG404:A:0253-360X(2004)01-115-040(TIGMIG),,,,[1],,[2],(),,,,,:2003-04-09:(59875003)VV1,,,,,[3]i(1),i=12qvzi3i=12Bizi2i,(1):;q;Bii;ii();ii,;zii,[4]i()j(),m,i()j()mimj1,(2),=imi-jmj(2)25120042TRANSACTIONSOFTHECHINAWELDINGINSTITUTIONVol.25No.1February2004©1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(mi,mj)andweldinglayernumber(i,j),[3],i;[4],22,ABM0,A=B=M0l6EI,[5](2),,2,p,l=k1Bis,:l,p,;Bi;s;k1,,,,,2M0Fig.2SketchofgenerationofsupposedbendingmomenM0,k1k1=(h-1)2hj=2j-2,(h2);k1=(h-1.5)2hj=2j-2,(h3);:h,hj=2j-2pii,,M0,M0=pizi,:pi;zi,33ziFig.3Sketchofeccentricityziofweldcenter,,pi=siL,:i;L;s,,i=2kA=kM0l3EI=4kk1iziBi3jy,(i2);(3):EI;k11625©1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.=y+i2;jy=y,zi=y+i22;jy=y-i2,:y;jy,(3)i=2k1i(y+i)3yBi(3)i=2k1i(y+i2)(y-i2)3Bi()B=i,,tg1=kB1121imv0tg=,1=k2B,(4):k;1(4)[6],,(4)B,,[7],Bi=k2Wiv10-3,:W=UI;v(cm/min);k233.1V4Q235(250mm150mm16mm),60,120A,25V,72cm/min,E43034mm4,0.8,k0.484Fig.4ExperimentalanalysisofangulardistortionB=4i=1i,;,5.8,5.71,3.2V5,,75,,(MIG:255A26V40cm/min),/5Fig.5Passorderinmulti-passwelding1,:117©1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.=2kB11(3)(4)6,0.50.60.70.8B=i-0.71kB,-0.69kB,-0.58kB,-0.54kB-3.10k,-3.01k,-2.53k,-2.37k6Fig.6Interrelationsamongangulardistortion,weldingpassandvalueof,,3.3(3)(1),,,:,,,(2),(3)[4]1,,10.50.84(1),(2),,(3),,:[1].[M].:,1982.[2].[D].:,2000.[3].[M].:,1990.[4]D.[M].:,1999.[5].[M].:,1986.[6].[M].:,1991.[7],.[M].:,1994.:,,19679,,3Email:[e-mail][114],Uab;ILs;ILk;ILp;UCs5(1)LCL,,(2)LCL,LCL,:[1],,,.LCL[J].,2000,21(4):8083.[2],,,.[J].,2003,24(3):5255.:,,19692,,,10Email:[e-mail]11825©1994-2007ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(1.ShanghaiJiaotongUniversity,Shanghai200030,China;2.CaterpillarXuzhouLtd.JiansuXuzhou221004,China).p107110Abstract:Residualplasticstrainmethodisappliedtotheplanenesspredictionoftheupperringsurfaceofgragbnetherframecarbodywhereweldsaredistributedinspatial.Formostofweldslieontheaboveofthegravity,thestructureisbendingtowardbottomafterwelding.Itisrea2sonableweldingbottomplateweldsandupperplateweldsbyturnstode2creaseoftheweldingdeformation.Residualplasticstrainmethodcannotconsidertheeffectoftheweldingsequencesontheweldingdeformation.Buttheeffectofpartsofweldsonthestructurecanbeindividualyana2lyzedbyresidualplasticstrainmethod.Calculationofthemaincircleweldsshowedthatitisprofitfordecreasingtheplanedegreebyweldingthecircleweldsinsegmentsandbyturns.Thepredictedplanedegreeoftheupperringsurfaceofgragnetherframecarbodyis0.68mm.Itseemsnoteasytomeetthedemandof0.5mm.Weldingcirclesinseg2mentsordiminishingthesizeofweldsaresuggestedtodecreasethepla2neessoftheupperringsurface.Keywords:netherframe;planeness;residualplasticstrain;finiteelementmethodMathematicalmodelofnewLCL-typemaincircuitofresonanttypesoft2switchingarcweldinginvertedpowersourceDUXian2chang1,DENGZhan2feng2,DUXu2chang3,BAIZhi2fan4(1.ChangchunInsti2tuteofTechnology,Changchun130012,China;2.TsinghuaUniversi2ty,Beijing100084,China;3.LaizhouBoilerInspectionBureau,Shan2dongLaizhou261400,China;4.JiliUniversity,Changchun130025,China).p111114,118Abstract:ThedissimilaritybetweenthenewLCL2typemaincircuitofsoft2switchinvertedweldingpowersourceandthebasicLCL2typeisintroduced.MathematicalmodelofnewLCL-typeoftheresonantsoft2switchinvertedweldingpowersourceisestablished,andanalyzedbyMatlabsoft2ware.Inordertotestandverifythemathematicalmodel,calculatingresultsofmathematicalmodeliscomparedwithtestingre2sults.Thearcweldingpowersourcehasnotonlyhighefficiencyofseriesresonantinthewholeloadrange,butalsobroadersoft2switchrange.Thedutycyclelossofthesecondingtransformeriseliminated.Keywords:newLCL-type;resonantsoft2switch;invertedmaincircuit;mathematicalmodelestablishingPredictionofangulardistortioninthickplatemulti2passweldYANGGuang2chen,XUEZhong2ming,ZHANGYan2hua(BeijingUni2versityofAeronauticsandAstronautics,Beijing100083,China).p1152118Abstract:Angulardistortionisaseriousprobleminmulti2passweld.However,researchonitwasverylacking.Thepredictionofan2gulardistortioninthickmulti2passweldisanalyzed,andtheexistedem2piricalformulasaboutangulardistortionaresummarizad.Amethodforangulardistortionanalysiswasputforward.Appliedthebasicmechani2calformulasandcombinedthecauseoftheweldingdistortion,anewformulafortheangulardistortioninmulti2passweldisdeduced.TwoexamplesaboutthicklowcarbonsteelbuttweldwithasingleV2grooveandthickaluminumalloybuttweldwithdoubleV2groovesareillustrat2ed.Keywords:welding;thickplate;multi2passweld;angulardistor2tionWeldingresidualstressrelievingofsteel921AofusingexplosivemethodHOUHai2liang,ZHUXi,LIURun2quan(DeptofNavalArchitecture&OceanEng,NavalUnivofEngineering,Wuhan430033,China).p119123Abstract:Specimenwasdesignedtosimulatetheweldofsubmarinepressurehullaccordingtoitsweldingprocedurne,andtheexpl