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Effect of process parameters of pulsed current tungsten inert gas welding on weld pool geometry of titanium welds

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Acta metallurgica Sinica(English Letters) 2010年第4期23卷 312-320页

作者： m.balasubramanian V.Jayabalan V.balasubramanian Department of mechanical Engineering Velammal Engineering CollegeSurapetAnna University Department of manufacturing Engineering Anna University Centre for materials Joining & Research Department of Manufacturing EngineeringAnnamalai University

The effects of pulsing current parameters on weld pool geometry namely front height, back height, front width and back width of pulse current gas tungsten arc welded （GTAW） titanium alloy was analysed. Four factors, five levels, central composite design were used to develop empirical relationships, incorporating pulsed current parameters and weld pool geometry.

关键词： Gas tungsten arc welding Pulsed current Titanium alloy Design of experiments

Optimizing the Pulsed Current Gas Tungsten Arc Welding Parameters

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Journal of materials Science & Technology 2006年第6期22卷 821-825页

作者： m.balasubramanian V.Jayabalan V. balasubramanian Department of Production Engineering Sathyabama Institute of Science and TechnologyIndia Department of manufacturing Engineering Anna UniversityIndia Department of manufacturing Engineering Annamalai UniversityIndia

The selection of process parameter in the gas tungsten arc （GTA） welding of titanium alloy was presented for obtaining optimum grain size and hardness. Titanium alloy （Ti-6Al-4V） is one of the most important non-ferrous metals which offers great potential application in aerospace, biomedical and chemical industries, because of its low density （4.5 g/cm^3）, excellent corrosion resistance, high strength, attractive fracture behaviour and high melting point （1678℃）. The preferred welding process for titanium alloy is frequent GTA welding due to its comparatively easier applicability and better economy. In the case of single pass （GTA） welding of thinner section of this alloy, the pulsed current has been found beneficial due to its advantages over the conventional continuous current process. many considerations come into the picture and one needs to carefully balance various pulse current parameters to reach an optimum combination. Four factors, five level, central composite, rotatable design matrix were used to optimize the required number of experimental conditions. mathematical models were developed to predict the fusion zone grain size using analysis of variance （ANOVA） and regression analysis. The developed models were optimized using the traditional Hooke and Jeeve＇s algorithm. Experimental results were provided to illustrate the proposed approach.

关键词： Pulsed current Gas tungsten arc welding Titanium alloy Design of experiments ANOVA, Hooke and Jeeve's algorithm Grain size Hardness

Process Parameter Optimization of the Pulsed Current Argon Tungsten Arc Welding of Titanium Alloy

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Journal of materials Science & Technology 2008年第3期24卷 423-426页

作者： m.balasubramanian V.Jayabalan V.balasubramanian Department of mechanical Engineering Maamallan Institute of Technology Department of manufacturing-Engineering Anna University Department of manufacturing Engineering Annamalai University

The selection of process parameters for obtaining optimal tensile properties in the pulsed current gas tungsten arc welding is presented. The tensile properties include ultimate tensile strength, yield strength and notch tensile strength. All these characteristics are considered together in the selection of process parameters by modified taguchi method to analyse the effect of each welding process parameter on tensile properties. Experimental results are furnished to illustrate the approach.

关键词： Pulsing current modified taguchi method Tensile properties

Synthesis and characterization of high ceramic yield polycarbosilane precursor for SiC

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Journal of Advanced Ceramics 2015年第4期4卷 307-311页

作者： mangesh LODHE Narendra BABU A.SELVAm m.balasubramanian Department of metallurgical and materials Engineering Indian Institute of Technology MadrasChennai 600036India FRP Institute Chennai 600032India

The polycarbosilane(PCS)precursor for SiC with high molecular weight and medium molecular weight distribution was synthesized from polydimethylsilane at normal *** chemical formula,the number average molecular weight,and the polydispersivity index of the synthesized PCS are SiC_(1.94)H_(5.01)O_(0.028),1135,and 1.66,respectively,which can be attributed to the higher reaction temperature used for *** polymer to ceramic conversion of PCS was completed at 900℃with a ceramic yield of 85%.The crystallization started at 1100℃,and at 1200℃,well resolved peaks ofβ-SiC were formed with small amount ofα-*** X-ray diffraction(XRD)and transmission electron microscopy(TEm)studies indicated the presence of nanocrystallineβ-SiC.

关键词： synthesis polycarbosilane(PCS) polymer-ceramic conversion X-ray diffraction(XRD)

Development of processing windows for diffusion bonding of Ti-6Al-4V titanium alloy and 304 stainless steel with silver as intermediate layer

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Transactions of Nonferrous metals Society of China 2015年第9期25卷 2932-2938页

作者： m.balasubramanian Department of mechanical Engineering R.M.K.College of Engineering and Technology

As titanium alloy is chemically reactive,it is very difficult to join by conventional welding *** alloys can easily pick up nitrogen and oxygen from the *** the fusion welding method,brittle intermetallic compounds are formed when joining titanium alloy and stainless steel,which decrease the mechanical behavior of the ***,for joining of titanium alloy,diffusion bonding is *** work dealt with the measurement of feasible process parameters for diffusion bonding of Ti-6Al-4V and AISI 304 stainless steel with silver as an intermediate *** quality of the bonds was confirmed by the lap shear test and microstructural *** the experimental results obtained,diffusion bonding windows were constructed and this will act as reference maps to identify the process parameters for obtaining defect free *** was successful in the temperature range of 750-800 °*** lap shear strength was achieved under a bonding pressure of 5 mPa and holding time of 90 min.

关键词： Ti-6Al-4V alloy silver AISI 304 stainless steel interlayer diffusion bonding

Experimental investigation of Tie6Ale4V titanium alloy and 304L stainless steel friction welded with copper interlayer

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Defence Technology（防务技术） 2015年第1期11卷 65-75页

作者： R.KUmAR m.balasubramanian mechanical Engineering SKP Institute of Technology RmK College of Engineering and Technology

The basic principle of friction welding is intermetallic bonding at the stage of super plasticity attained with self-generating heat due to friction and finishing at upset pressure. Now the dissimilar metal joints are especially popular in defense, aerospace, automobile, bio-medical,refinery and nuclear engineerings. In friction welding, some special alloys with dual phase are not joined successfully due to poor bonding strength. The alloy surfaces after bonding also have metallurgical changes in the line of interfacing. The reported research work in this area is scanty. Although the sound weld zone of direct bonding between Tie6Ale4 V and SS304 L was obtained though many trials, the joint was not successful. In this paper, the friction welding characteristics between Tie6Ale4 V and SS304 L into which pure oxygen free copper(OFC) was introduced as interlayer were investigated. Boxe Behnken design was used to minimize the number of experiments to be performed. The weld joint was analyzed for its mechanical strength. The highest tensile strength between Tie6Ale4 V and SS304 L between which pure copper was used as insert metal was acquired. micro-structural analysis and elemental analysis were carried out by EDS, and the formation of intermetallic compound at the interface was identified by XRD analysis.

关键词： Friction welding Tie6Ale4V SS304L Oxygen free copper Interlayer microstructure Interface

Application of response surface methodology to optimize process parameters in friction welding of Ti-6Al-4V and SS304L rods

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Transactions of Nonferrous metals Society of China 2015年第11期25卷 3625-3633页

作者： R.KUmAR m.balasubramanian Department of mechanical Engineering SKP Institute of Technology RmK College of Engineering and Technology

A method to decide near optimal settings of the process parameters in friction welding was *** success of the friction welding process is based on various input parameters like friction pressure,friction time,upset pressure and upset time and output parameters like tensile strength,hardness and material ***-6Al-4V and SS304L(SS) materials were joined by friction welding process using interlayer *** Box-Behnken design and response surface methodology(RSm) were applied to deciding the number of experiments to be performed and identify the optimum process parameters for obtaining better joint *** results were highly *** strength of 523 mPa was obtained at a friction pressure of 12 N/mm^2,upset pressure of40 N/mm^2,friction time of 1.2 s and upset time of 7 s.

关键词： friction welding welding parameters Ti-6Al-4V SS304L copper interlayer

modeling corrosion behavior of gas tungsten arc welded titanium alloy

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中国有色金属学会会刊：英文版 2007年第4期17卷 676-680页

作者： m. balasubramanian V. Jay abalan V. balasubramanian Department of mechanical Engineering Maamallan Institute of Technology Anna University Department of manufacturing Engineering Anna University Department of manufacturing Engineering Annamalai University

The pitting corrosion characteristics of pulse TIG welded Ti-6Al-4V titanium alloy in marine environment were explained. Besides the rapid advance of titanium metallurgy, this is also due to the successful solution of problems associated with the development of titanium alloy welding. The preferred welding process of titanium alloy is frequently gas tungsten arc(GTA) welding due to its comparatively easier applicability and better economy. In the case of single pass GTA welding of thinner section of this alloy, the pulsed current has been found beneficial due to its advantages over the conventional continuous current process. The benefit of the process is utilized to obtain better quality titanium weldments. Four factors, five levels, central composite, rotatable design matrix are used to optimize the required number of experiments. The mathematical models have been developed by response surface method(RSm). The results reveal that the titanium alloy can form a protective scale in marine environment and is resistant to pitting corrosion. Experimental results are provided to illustrate the proposed approach.

关键词：钛合金脉冲电流钨电极惰性气体保护焊腐蚀行为

microstructure,Tensile and Impact Toughness Properties of Friction Stir Welded mild Steel

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Journal of Iron and Steel Research International 2010年第10期17卷 68-74页

作者： A K Lakshminarayanan V balasubramanian m Salahuddin Department of manufacturing Engineering Annamalai University Clean Technology Division Ministry of Environment and Forests

microstructure, tensile and impact toughness properties and fracture location of friction stir welded AISI 1018 mild steel were revealed. The AISI 1018 mild steel plates with thickness of 5 mm were friction stir welded by tungsten based alloy tool with tool rotational speed of 1 000 r/min and welding speed of 50 ram/rain. Tensile strength of stir zone is higher （8%） compared to that of the base metal. This may be due to the formation of finer grains in the weld nugget region under the stirring action of the rotating tool. The ductility and impact toughness of the joints are decreased compared to those of the base metal owing to the inclusion of tungsten particles in the weld region.

关键词： friction stir welding tensile property impact toughness mildsteel