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Developing friction stir welding window for a.2219 a.uminium a.loy

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Tra.sa.tions of Nonferrous Meta.s Society of China 2011年第11期21卷 2339-2347页

作者： a. k. lakshminarayanan S. Ma.a.VIZHI V. Ba.a.UBRa.a.Ia. Centre for Ma.eria.s Joining & Resea.ch (CEMa.OR) Department of Manufacturing Engineering Annamalai University

a.friction stir welding window wa. developed for effective joining of a.2219 a.uminium a.loy. Joints were fa.rica.ed using different combina.ion of process pa.a.eters such a. rota.iona. speed a.d welding speed. Ba.ed on ma.rostructura. a.a.ysis, the friction stir welding window wa. constructed. The strength va.ues of joints a. different regions of friction stir welding window were a.a.yzed using tensile properties, microstructura. studies, a.d the fra.ture loca.ion of joints wa. correla.ed with the lowest ha.dness distribution profiles. These windows will a.t a. reference ma.s for selecting a.propria.e friction stir welding process pa.a.eters to get good qua.ity welds of a.2219 a.uminium a.loys.

关键词： friction stir welding window a.uminium a.loy lowest ha.dness distribution profile tensile strength

Tensile a.d Impa.t Properties of Shielded Meta. a.c Welded a.SI 409M Ferritic Sta.nless Steel Joints

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Journa. of Ma.eria.s Science & Technology 2009年第2期25卷 181-186页

作者： k. Sha.muga. a.k. lakshminarayanan V. Ba.a.ubra.a.ia. Centre for Ma.eria.s Joining & Resea.ch (CEMa.OR) Department of Manufacturing Engineering Annamalai UniversityAnnamalai Nagar 608 002 Tamil Nadu India

The present study is concerned with the effect of filler meta.s such a. a.stenitic sta.nless steel, ferritic sta.nless steel a.d duplex sta.nless steel on tensile a.d impa.t properties of the ferritic sta.nless steel conforming to a.SI 409M gra.e. Rolled pla.es of 4 mm thick.ess were used a. the ba.e ma.eria. for prepa.ing single pa.s butt welded joints. Tensile a.d impa.t properties, microha.dness, microstructure a.d fra.ture surfa.e morphology of the joints fa.rica.ed by a.stenitic sta.nless steel, ferritic sta.nless steel a.d duplex sta.nless steel filler meta.s were eva.ua.ed a.d the results were reported. From this investiga.ion, it is found tha. the joints fa.rica.ed by duplex sta.nless steel filler meta. showed higher tensile strength a.d ha.dness compa.ed to the joints fa.rica.ed by a.stenitic a.d ferritic sta.nless steel filler meta.s. Joints fa.rica.ed by a.stenitic sta.nless steel filler meta. exhibited higher ductility a.d impa.t toughness compa.ed with the joints fa.rica.ed by ferritic sta.nless steel a.d duplex sta.nless steel filler meta.s.

关键词： Ferritic sta.nless steel Shielded meta. a.c welding Tensile properties Impa.t toughness

Eva.ua.ion of Microstructure a.d Mecha.ica. Properties of La.er Bea. Welded a.SI 409M Gra.e Ferritic Sta.nless Steel

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Journa. of Iron a.d Steel Resea.ch Interna.iona. 2012年第1期19卷 72-78页

作者： a.k.lakshminarayanan V Ba.a.ubra.a.ia. Depa.tment of Ma.ufa.turing Engineering Annamalai University

The microstructure a.a.ysis a.d mecha.ica. properties eva.ua.ion of la.er bea. welded a.SI 409M ferritic sta.nless steel joints a.e investiga.ed. Single pa.s a.togeneous welds free of volumetric defects were produced a. a.welding speed of 3 000 mm/min. The joints were subjected to optica. microscope, sca.ning electron fra.togra.he, microha.dness, tra.sverse a.d longitudina. tensile, bend a.d cha.py impa.t toughness testing. The coa.se ferrite gra.ns in the ba.e meta. were cha.ged into dendritic gra.ns a. a.result of ra.id solidifica.ion of la.er bea. welds. Tensile testing indica.es overma.ching of the weld meta. is rela.ive to the ba.e meta.. The joints a.so exhibited a.cepta.le impa.t toughness a.d bend strength properties.

关键词： la.er bea. welding ferritic sta.nless steel tensile property impa.t property

Process pa.a.eters optimiza.ion for friction stir welding of RDE-40 a.uminium a.loy using Ta.uchi technique

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中国有色金属学会会刊：英文版 2008年第3期18卷 548-554页

作者： a.k.lakshminarayanan V.Ba.a.UBRa.a.Ia. Centre for Ma.eria.s Joining Resea.ch(CEMa.OR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalai Nagar608002 Tamil Nadu India

Ta.uchi a.proa.h wa. a.plied to determine the most influentia. control fa.tors which will yield better tensile strength of the joints of friction stir welded RDE-40 a.uminium a.loy. In order to eva.ua.e the effect of process pa.a.eters such a. tool rota.iona. speed, tra.erse speed a.d a.ia. force on tensile strength of friction stir welded RDE-40 a.uminium a.loy, Ta.uchi pa.a.etric design a.d optimiza.ion a.proa.h wa. used. Through the Ta.uchi pa.a.etric design a.proa.h, the optimum levels of process pa.a.eters were determined. The results indica.e tha. the rota.iona. speed, welding speed a.d a.ia. force a.e the significa.t pa.a.eters in deciding the tensile strength of the joint. The predicted optima. va.ue of tensile strength of friction stir welded RDE-40 a.uminium a.loy is 303 MPa. The results were confirmed by further experiments.

关键词：铝合金摩擦焊接抗张强度加工处理

Effect of a.togenous a.c Welding Processes on Tensile a.d Impa.t Properties of Ferritic Sta.nless Steel Joints

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Journa. of Iron a.d Steel Resea.ch Interna.iona. 2009年第1期16卷 62-68,16页

作者： a.k.lakshminarayanan k.Sha.muga. V Ba.a.ubra.a.ia. Centre of Ma.eria.s Joining a.d Resea.ch (CEMa.OR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalai Nagar-608002Tamil NaduIndia

The effect of a.togeneous a.c welding processes on tensile a.d impa.t properties of ferritic sta.nless steel conformed to a.SI 409M gra.e is studied. Rolled pla.es of 4 mm thick.ess ha.e been used a. the ba.e ma.eria. for prepa.ing single pa.s butt welded joints. Tensile a.d impa.t properties, microha.dness, microstructure, a.d fra.ture surfa.e morphology of continuous current ga. tungsten a.c welding （CCGTa.）, pulsed current ga. tungsten a.c welding （PCGTa.）, a.d pla.ma.a.c welding （Pa.） joints a.e eva.ua.ed a.d the results a.e compa.ed. It is found tha. the Pa. joints of ferritic sta.nless steel show superior tensile a.d impa.t properties when compa.ed with CCG-Ta. a.d PCGTa. joints, a.d this is ma.nly due to lower hea. input, finer fusion zone gra.n dia.eter, a.d higher fusion zone ha.dness.

关键词： ferritic sta.nless steel pla.ma.a.c welding continuous current ga. tungsten a.c welding pulsed currentga. tungsten a.c welding tensile property impa.t property

Effect of Welding Processes on Tensile a.d Impa.t Properties,Ha.dness a.d Microstructure of a.SI 409M Ferritic Sta.nless Joints Fa.rica.ed by Duplex Sta.nless Steel Filler Meta.

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Journa. of Iron a.d Steel Resea.ch Interna.iona. 2009年第5期16卷 66-72页

作者： a.k.lakshminarayanan k.Sha.muga. V Ba.a.ubra.a.ia. Centre for Ma.eria.s Joining a.d Resea.ch(CEMa.OR) Department of Manufacturing EngineeringAnnamalai University

The effect of welding processes such a. shielded meta. a.c welding, ga. meta. a.c welding a.d ga. tungsten a.c welding on tensile a.d impa.t properties of the ferritic sta.nless steel conforming to a.SI 409M gra.e is studied. Rolled pla.es of 4 mm thick.ess were used a. the ba.e ma.eria. for prepa.ing single pa.s butt welded joints. Tensile a.d impa.t properties, microha.dness, microstructure a.d fra.ture surfa.e morphology of the welded joints ha.e been eva.ua.ed a.d the results a.e compa.ed. From this investiga.io.n, it is found tha. ga. tungsten a.c welded joints of ferritic sta.nless steel ha.e superior tensile a.d impa.t properties compa.ed with shielded meta. a.c a.d ga. meta. a.c welded joints a.d this is ma.nly due to the presence of finer gra.ns in fusion zone a.d hea. a.fected zone.

关键词： ferritic sta.nless steel shielded meta. a.c welding ga. meta. a.c welding ga. tungsten a.c welding tensile impa.t property

Microstructure,Tensile a.d Impa.t Toughness Properties of Friction Stir Welded Mild Steel

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Journa. of Iron a.d Steel Resea.ch Interna.iona. 2010年第10期17卷 68-74页

作者： a.k.lakshminarayanan V Ba.a.ubra.a.ia. M Sa.a.uddin Depa.tment of Ma.ufa.turing Engineering Annamalai University Clea. Technology Division Ministry of Environment and Forests

Microstructure, tensile a.d impa.t toughness properties a.d fra.ture loca.ion of friction stir welded a.SI 1018 mild steel were revea.ed. The a.SI 1018 mild steel pla.es with thick.ess of 5 mm were friction stir welded by tungsten ba.ed a.loy tool with tool rota.iona. speed of 1 000 r/min a.d welding speed of 50 ra./ra.n. Tensile strength of stir zone is higher （8%） compa.ed to tha. of the ba.e meta.. This ma. be due to the forma.ion of finer gra.ns in the weld nugget region under the stirring a.tion of the rota.ing tool. The ductility a.d impa.t toughness of the joints a.e decrea.ed compa.ed to those of the ba.e meta. owing to the inclusion of tungsten pa.ticles in the weld region.

关键词： friction stir welding tensile property impa.t toughness mildsteel

a.plica.ion of Response Surfa.e Methodolody to Prediction of Dilution in Pla.ma.Tra.sferred a.c Ha.dfa.ing of Sta.nless Steel on Ca.bon Steel

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Journa. of Iron a.d Steel Resea.ch Interna.iona. 2009年第1期16卷 44-53页

作者： V Ba.a.ubra.a.ia. a.k.lakshminarayanan R Va.a.a.oorthy S Ba.u Centre for Ma.eria.s Joining a.d Resea.ch (CEMa.OR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalai Nagar 608002Tamil NaduIndia

The a.plica.ion of response surfa.e methodology wa. highlighted to predict a.d optimize the percenta.e of dilution of iron-ba.ed ha.dfa.ed surfa.e produced by the PTa.（pla.ma.tra.isferred a.c welding） process. The experiments were conducted ba.ed on five-fa.tor five-level centra. composite rota.a.le design with full replica.ion technique a.d a.ma.hema.ica. model wa. developed using response surfa.e methodology. Furthermore, the response surfa.e methodology wa. a.so used to optimize the process pa.a.eters tha. yielded the lowest percenta.e of dilution.

关键词： pla.ma.tra.sferred a.c ha.dfa.ing dilution response surfa.e methodology

Flexura. response of doubly curved la.ina.ed composite shells

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Science China.Physics,Mecha.ics & a.tronomy) 2013年第4期56卷 812-817页

作者： SHa.Ma.a.buj UPa.HYa. a. k. SHUk.a.k. k. Depa.tment of a.plied Mecha.ics MNNIT Allahabad-211004 India

In the present work. a.a.ytica. solutions for la.ina.ed composite doubly curved pa.els on recta.gula. pla. form undergoing sma.l deforma.ions a.d subjected to uniformly distributed tra.sverse loa. ha.e been obta.ned. The problem is formula.ed using first order shea. deforma.ion theory. The spa.ia. descretiza.ion of the linea. differentia. equa.ions is ca.ried out using fa.t converging finite double Chebyshev series. The effect of pa.el thick.ess, curva.ure, bounda.y conditions, la.ina.ion scheme a. well a. ma.eria. property on the sta.ic response of pa.el ha. been investiga.ed in deta.l.

关键词： doubly curved pa.el a.a.ytica. Chebyshev sta.ic recta.gula. pla. form