厚板多层多道焊角变形分析方法(2)

对于高强铝合金来说,ξ取值以及如何对结果

进行修正,作者缺乏试验数据支持。3.3　讨　论

通过以上计算分析总结式(3)有以下特点。(1)它是根据最基本的材料力学公式推导而出,理论依据充分,容易理解。公式形式简单明了,根据热输入就可以计算出每道焊缝所引起的角变形量。例如:相同板厚情况下,坡口形式及坡口角度不同,将引起热输入的差别,最终导致角变形大小不同。

(2)对不同层、不同道焊缝角变形的计算进行

航空航天大学,2000.

[3]　中国机械工程学会焊接学会.焊接结构设计手册[M].北京:

机械工业出版社,1990.

[4]　拉达伊D.焊接热效应[M].北京:机械工业出版社,1999.[5]　单辉祖.材料力学[M].北京:国防工业出版社,1986.

[6]　焦馥杰.焊接结构分析基础[M].上海:上海科学技术文献出版

社,1991.

[7]　傅积和,孙玉林.焊接数据资料手册[M].北京:机械工业出版

社,1994.

作者简介:

杨广臣,男,1967年9月出生,博士研究生。主要研究

方向为焊接结构分析,发表论文3篇。

Email:yanggc123@

[上接第114页](2)新型LCL谐振逆变弧焊电源主电路设计

　　图中,Uab为变压器初级电压;ILs为串联电感电流;ILk为变压器初级电流;ILp为并联电感电流;

UCs为串联电容电压。

合理,消除了基本LCL型占空比丢失的弊端,提高

了变压器的工作效率。参考文献:

[1]　白志范,王伟明,蒋志宏,等.LCL型谐振式弧焊电源稳态数学

5　结　　论

(1)建立了新型LCL谐振弧焊逆变电源稳态

分析[J].焊接学报,2000,21(4):80～83.

[2]　杜贤昌,白志范,邓占锋,等.谐振式软开关弧焊逆变电源[J].

工作时的数学模型。该模型数值计算结果与实测波形能较好地吻合,说明建立的数学模型是正确的。

同时,也为此种主电路结构的弧焊逆变电源设计提供了依据。

焊接学报,2003,24(3):52～55.

作者简介:

杜贤昌,男,1969年2月出生,工学硕士,副教授。主

要研究方向为新型弧焊电源,发表论文10余篇。

Email:duxianchang@

厚板多层多道焊角变形分析方法——焊接技术

　8　　　　MAINTOPICS,ABSTRACTS&KEYWORDS　　　　　2004,Vol.25,No.

1

angulardistortionanalysiswasputforward.Appliedthebasicmechani2calformulasandcombinedthecauseoftheweldingdistortion,anewformulafortheangulardistortioninmulti2passweldisdeduced.TwoexamplesaboutthicklowcarbonsteelbuttweldwithasingleV2grooveandthickaluminumalloybuttweldwithdoubleV2groovesareillustrat2ed.

Keywords:welding;thickplate;weld;angulardistor2tion

al921AofusingexplosiveHOU2,Xi,LIURun2quan(DeptofNavalEng,NavalUnivofEngineering,Wuhan,China).p119123

Abstract:Specimenwasdesignedtosimulatetheweldofsubmarinepressurehullaccordingtoitsweldingprocedurne,andtheexplosivepro2cedunewasdesignedtorelieveweldingresidualstressofthespecimenaccordingtothebasicprincipleandtheexperienceofweldingresidualstressrelievingbyusingexplosivemethod.Experimentalresearchonweldingresidualstressrelievingofsteel921Awascarriedout.There2sultsshowthatexplosiverelievingbothononesideandondoublesidescanregulateandrelieveresidualstress.Thedistributionoftheresidualstressismoreregular,andtherelievingeffectofcontactexplosionisbetterthannon2contactexplosion,explosionwaveisbetterthanthebouncingrarefactionwave.Explosionondoublesidesisbetterthanononeside.

Keywords:explosivemethod;weldingresidualstress;residualstressrelieving;submarinepressurehull

Progressinvariablepolarityplasmaarcwelding　　CHENKe2xuan,LIHe2qi,LIChun2xu(LanzhouUniversityofTechnology,Lanzhou730050,China).p124128

Abstract:Theadvantageofvariablepolarityplasmaarcweldingisthatthecharacteristicparameterssuchasthefrequency,currentampli2tudeandDCEN/DCEPratiocanbeadjustedatwilltomeettheneedofcathodiccleaningandkeyholing.Thestatusofrealizationofvariablepo2laritycurrentwaveform,arcstability,cathodiccleaningmechanismandkeyholedetectionisintroducedinthispaper.Toensurethesynchroniza2tionbetweenprimaryandsecondarycircuitisthekeyofdual-inverter.Dual2passagecaneliminatetheinterferencebetweenmainarcandpilotarc,anddecreasethedeteriorationoftungstenelectrode.Ionsputteringorionbombardment,dielectricbreakdownandmomentarymeltingandevaporatingarethemaintheoriesofcathodiccleaningmechanism.Itis

Abstract:Angulardistortionisaseriousprobleminmulti2pass

moreimportanttomastertheregularityofcleaning.Ofallrecentdevel2opedkeyholedetectionmethods,frontsidedetectionandmulti2sensinginformationisstilltheleadingdirection.

Keywords:variablepolarityplasmaarcwelding;arcstability;ca2thodiccleaning;keyholedetection

CHENYu2(1.ShanghaiJiaotongUniversity,Shanghai200030,China;2.CaterpillarXuzhouLtd.JiansuXuzhou221004,China).p107110

Abstract:Residualplasticstrainmethodisappliedtotheplanenesspredictionoftheupperringsurfaceofgragbnetherframecarbodywhereweldsaredistributedinspatial.Formostofweldslieontheaboveofthegravity,thestructureisbendingtowardbottomafterwelding.Itisrea2sonableweldingbottomplateweldsandupperplateweldsbyturnstode2creaseoftheweldingdeformation.Residualplasticstrainmethodcannotconsidertheeffectoftheweldingsequencesontheweldingdeformation.Buttheeffectofpartsofweldsonthestructurecanbeindividualyana2lyzedbyresidualplasticstrainmethod.Calculationofthemainweldsshowedthatitisprofitfordecreasingtheplanebythecircleweldsinsegmentsandbyturns.planetheupperringsurfaceof68Itseemsnoteasytomeetmm.circlesinseg2mentsorofaretodecreasethepla2neessoftheupperKeywords:netherframe;planeness;residualplasticstrain;finiteelementmethod

MathematicalmodelofnewLCL-typemaincircuitofresonanttypesoft2switchingarcweldinginvertedpowersource　　DUXian2chang1,DENGZhan2feng,DUXu2chang,BAIZhi2fan(1.ChangchunInsti2tuteofTechnology,Changchun130012,China;2.TsinghuaUniversi2ty,Beijing100084,China;izhouBoilerInspectionBureau,Shan2dongLaizhou261400,China;4.JiliUniversity,Changchun130025,China).p111114,118

Abstract:ThedissimilaritybetweenthenewLCL2typemaincircuitofsoft2switchinvertedweldingpowersourceandthebasicLCL2typeisintroduced.MathematicalmodelofnewLCL-typeoftheresonantsoft2switchinvertedweldingpowersourceisestablished,andanalyzedbyMatlabsoft2ware.Inordertotestandverifythemathematicalmodel,calculatingresultsofmathematicalmodeliscomparedwithtestingre2sults.Thearcweldingpowersourcehasnotonlyhighefficiencyofseriesresonantinthewholelo …… 此处隐藏：3699字，全部文档内容请下载后查看。喜欢就下载吧 ……