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Transactions of Nonferrous Metals Society of China 2010年第6期20卷 1078-1091页

作者： D.S.BADKAR K.S.PANDEY G.BUVANASHEKARAN Maulana Azad National Institute of Technology Welding Research Institute Bharat Heavy Electricals Limited

Laser transformation hardening(LTH)of unalloyed titanium of 1.6 mm-thick sheet,nearer to ASTM Grade 3 of chemical composition was investigated using 2 kW CW Nd:YAG *** effects of laser power(750-1 250 W),scanning speed(1 000-3 000 mm/min)and focal point position(from-10 to-30 mm)on the heat input,and hardened-bead geometry(*** bead width(HBW),hardened depth(HD)and angle of entry of hardened bead profile with the surface(AEHB))were investigated using response surface methodology(RSM).The experimental plan is based on Box-Behnken design matrix *** and quadratic polynomial equations for predicting the heat input and the hardened bead geometry were *** results indicate that the proposed models predict the responses adequately within the limits of hardening parameters being *** is suggested that regression equations can be used to find optimum hardening conditions for desired criteria.

关键词： laser transformation hardening response surface methodology(RSM) unalloyed titanium titanium hardened-bead profile

Characterization of magnetically impelled arc butt welded T11 tubes for high pressure applications

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Defence Technology（防务技术） 2015年第3期11卷 244-254页

作者： R.SIVASANKARI V.BALUSAMY P.R.VENKATESWARAN G.BUVANASHEKARAN K.GANESH KUMAR Department of Metallurgical Engineering PSG College of Engineering Welding Research Institute Bharat Heavy Electricals Limited

Magnetically impelled arc butt(MIAB) welding is a pressure welding process used for joining of pipes and tubes with an external magnetic field affecting arc rotation along the tube circumference. In this work, MIAB welding of low alloy steel(T11) tubes were carried out to study the microstructural changes occurring in thermo-mechanically affected zone(TMAZ). To qualify the process for the welding applications where pressure could be up to 300 bar, the MIAB welds are studied with variations of arc current and arc rotation time. It is found that TMAZ shows higher hardness than that in base metal and displays higher weld tensile strength and ductility due to bainitic transformation. The effect of arc current on the weld interface is also detailed and is found to be defect free at higher values of arc currents. The results reveal that MIAB welded samples exhibits good structural property correlation for high pressure applications with an added benefit of enhanced productivity at lower *** study will enable the use of MIAB welding for high pressure applications in power and defence sectors.

关键词：磁控电弧磁场影响高压力应用压力焊接特性对焊驱动

Solar photovoltaic fed dual input LED lighting system with constant illumination control

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Frontiers in Energy 2016年第4期10卷 473-478页

作者： Kinattingal SUNDARESWARAN Kevin Ark KUMAR Payyalore Raman VENKATESWARAN Sankaran PALANI Department of Electrical and Electronics Engineering National Instituteof Technology Tiruchirappalli 620015 India bharat heavy electricals limited Tiruchirappalli 620014 India Sudharsan Engineering College Pudukkottai 622501 India

A dual input LED lighting scheme with constant illumination is proposed in this paper. The scheme employs a photovoltaic array as the first input and a battery as the second one. A microcontroller is programmed to operate a changeover switch as well as a DC-DC converter for uninterrupted and constant illumina- tion in work place. The scheme is suitable for conference halls, laboratories, clean rooms, marriage halls, theaters, etc. The complete modeling, design and experimentation of the proposed scheme are explained and the economic viability of the scheme is justified.

关键词： photovoltaic LED light dual input P&O algorithm

Effect of thermal cycle on Ni-Cr based nanostructured thermal spray coating in boiler tubes

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Transactions of Nonferrous Metals Society of China 2015年第5期25卷 1533-1542页

作者： V.SENTHILKUMAR B.THIYAGARAJAN M.DURAISELVAM K.KARTHICK Department of Production Engineering National Institute of Technology bharat heavy electricals limited

Ni-Cr based nanostructured feedstock powder was prepared by mechanical milling technique involving repeated welding, fracturing, and re-welding of powder particles in a planetary ball mill. The milled nanocrystalline powders were used to coat carbon steel tubes using high velocity oxygen fuel（HVOF） thermal spraying process. The characterization of the feedstock powder and HVOF coated substrates was performed using optical microscope, X-ray diffractometer（XRD）, scanning electron microscope（SEM）, high resolution transmission electron microscope（HR-TEM）, energy dispersive spectrometer（EDS） and microhardness tests. The coated and uncoated samples were subjected to different thermal cycles and characterized for their phase changes, metallurgical changes and microhardness variations. Ni-Cr nanostructured coated samples exhibited higher mechanical and metallurgical properties compared to their conventionally coated counter parts. The results showed that the nanostructured coating possessed a more uniform and denser microstructure than the conventional coating.

关键词： nanostructure coating feedstock powder thermal spray boiler tubes high velocity oxygen fuel

Shielding measures of power transformer to mitigate stray loss and hot spot through coupled 3D FEA

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High Voltage 2017年第4期2卷 267-273页

作者： Sujana Dasara Vineet Prakash Mishra Department of Electrical&Electronics Engineering Jawaharlal Nehru Technological UniversityKukatpallyHyderabadIndia High Voltage Engineering Department Bharat Heavy Electricals Limited(BHEL)R&DVikas NagarHyderabadIndia

Leakage flux generated in the power transformers cause stray losses in metallic parts of the *** losses largely affect the transformer hot spot which leads to thermal *** is necessary to mitigate the impact of leakage flux on metallic parts by employing magnetic shunts and eddy current *** clamping structures like flitch plate and end frames experience substantial losses,hence combinations of shielding can be used for better loss *** this study,a case study is performed on a 315 MVA,420/27 kV single-phase generator power *** work is based on coupled three-dimensional(3D)finite-element analysis(FEA)of the transformer model.A new type of magnetic shunt is explored;also different design combinations of shielding are specified in this work for efficient mitigation of hot spots as well as tank walls.

关键词： power walls hence

Raw Material, Solid Waste, Industrial Workshop, Castings/Forgings, Plates

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Raw Material, Solid Waste, Industrial Workshop, Castings/For...

Optimisation of laser welding parameters for welding of P92 material using Taguchi based grey relational analysis

7th World Congress on Recovery, Recycling and Re-integration

作者： Satish Chandra Goyal bharat heavy electricals limited Hardwar Uttaranchal India

Most of our environmental difficulties originate from man's abuse of nature. Development can not be at the cost of environment. Environment and development are complementary The main issue is to ensure that economic, social, medical and environmental effects are within tolerable levels, which will maintain or enhance our existing quality of life. There are adequate knowledge, expertise, methodologies and guide lines available in the field of environment, such knowledge and information need to be translated to a wider range so that they can be used effectively. Solid wastes in industry are being generated basically for various reasons. Most of industrial solid waste generated is either dumped or recycled The dumping is expensive not only in terms of loss of valuable industrial raw materials but also for raising environmental pollution As the industrial development accelerates in India, more and more solid waste will be generated, which will need to be disposed off in an environmentally safe manner With the ever increasing cost of materials, it is essential for our electrical machines manufacturing plants to recycle some of the solid wastes generated. There are several ways of recycling solid wastes for such manufacturing plants. The methods which can be used effectively for recycling of industrial wastes include punching of stampings, melting of rejected castings, reworking on machining components and use of tailoring charts with the help of software program in the process of cutting the sheets/plates

关键词： recycling, industrial solid wastes, treatment method

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Defence Technology（防务技术） 2016年第4期12卷 343-350页

作者： Shanmugarajan B. Rishabh SHRIVASTAVA Sathiya P. Buvanashekaran G. Welding Research Institute Bharat Heavy Electricals Ltd. Tiruchirappalli 620014 Tamil Nadu India GE India Technology Centre Bangalore India Department of Production Engineering NIT Tiruchirappalli India

Creep strength enhanced ferritic(CSEF) steels are used in advanced power plant systems for high temperature applications. P92(Cr–W–Mo–V)steel, classified under CSEF steels, is a candidate material for piping, tubing, etc., in ultra-super critical and advanced ultra-super critical boiler applications. In the present work, laser welding process has been optimised for P92 material by using Taguchi based grey relational analysis(GRA).Bead on plate(BOP) trials were carried out using a 3.5 k W diffusion cooled slab CO_2 laser by varying laser power, welding speed and focal position. The optimum parameters have been derived by considering the responses such as depth of penetration, weld width and heat affected zone(HAZ) width. Analysis of variance(ANOVA) has been used to analyse the effect of different parameters on the responses. Based on ANOVA, laser power of 3 k W, welding speed of 1 m/min and focal plane at-4 mm have evolved as optimised set of parameters. The responses of the optimised parameters obtained using the GRA have been verified experimentally and found to closely correlate with the predicted value.? 2016 China Ordnance Society. Production and hosting by Elsevier B.V. All rights reserved.

关键词： Laser Welding Optimisation Taguchi P92

Pulsed current and dual pulse gas metal arc welding of grade AISI: 310S austenitic stainless steel

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Defence Technology（防务技术） 2015年第3期11卷 269-274页

作者： A.MATHIVANAN A.SENTHILKUMAR K.DEVAKUMARAN Mechanical Engineering Department SRM University School of Mechanical and Building Sciences (SMBS) VIT University Welding Research Institute Bharath Heavy Electricals Limited (BHEL)

The transverse shrinkage, mechanical and metallurgical properties of AISI: 310 S ASS weld joints prepared by P-GMAW and DP-GMAW processes were investigated. It was observed that the use of the DP-GMAW process improves the aforementioned characteristics in comparison to that of the P-GMAW process. The enhanced quality of weld joints obtained with DP-GMAW process is primarily due to the combined effect of pulsed current and thermal pulsation(low frequency pulse). During the thermal pulsation period, there is a fluctuation of wire feed rate,which results in the further increase in welding current and the decrease in arc voltage. Because of this synchronization between welding current and arc voltage during the period of low frequency pulse, the DP-GMAW deposit introduces comparatively more thermal shock compared to the P-GMAW deposit, thereby reducing the heat input and improves the properties of weld joints.

关键词： AISI 电弧焊接奥氏体不锈钢脉冲气体电流脉冲品位金属力学性能

A Unique Modelling Strategy to Dynamically Simulate the Performance of a Lobe Pump for Industrial Applications

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Advances in Chemical Engineering and Science 2024年第2期14卷 57-73页

作者： Deepak Kumar Kanungo Rabiranjan Murmu Harekrushna Sutar bharat heavy electricals limited Corporate R & D Hyderabad Telangana India Chemical Engineering Department Indira Gandhi Institute of Technology Sarang Odisha India

The performance of a newly designed tri-lobe industrial lobe pump of high capacity is simulated by using commercial CFD solver Ansys Fluent. A combination of user-defined-functions and meshing strategies is employed to capture the rotation of the lobes. The numerical model is validated by comparing the simulated results with the literature values. The processes of suction, displacement, compression and exhaust are accurately captured in the transient simulation. The fluid pressure value remains in the range of inlet pressure value till the processes of suction and displacement are over. The instantaneous process of compression is accurately captured in the simulation. The movement of a particular working chamber is traced along the gradual degree of lobe’s rotation. At five different degrees of lobe’s rotation, pressure contour plots are reported which clearly shows the pressure values inside the working chamber. Each pressure value inside the working chamber conforms to the particular process in which the working chamber is operating. Finally, the power requirement at the shaft of rotation is estimated from the simulated values. The estimated value of power requirement is 3.61 BHP FHP whereas the same calculated theoretically is 3 BHP FHP. The discrepancy is attributed to the assumption of symmetry of blower along the thickness.

关键词： CFD Lobe Pump Moving Dynamic Mesh Pressure Fluctuation Transient Simulation

High Temperature Oxidation and Hot Corrosion Behaviour of 9Cr 1Mo Ferritic Cold Rolled Steel in Air at 900°C under Cyclic Condition

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Journal of Minerals and Materials Characterization and Engineering 2011年第11期10卷 1061-1075页

作者： Amarish K. Shukla Dinesh Gond M. Bharadwaj D. Puri HEEP Bharat Heavy Electricals Limited Haridwar.(Government Of India Undertaking) India Metallurgical & Materials Engineering Department Indian Institute of Technology RoorkeeIndia

The oxidation behaviour of 10%, 30%, and 50% cold rolled and unprocessed 9Cr 1Mo ferritic steels in air have been studied under isothermal conditions at a temperature of 900°C in a cyclic manner. Oxidation kinetics was established for all samples on which experiment was conducted in air at 900°C under cyclic conditions for 50 cycles by thermogravimetric technique. Each cycle consisted of 1 hour heating at 900°C followed by 20 min of cooling in air. 10% cold rolled sample followed parabolic rate of oxidation while 30% cold rolled sample showed accelerated rate of weight gain. X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive X-ray (SEM/EDAX) techniques were used to characterise the oxidized sample and their scales. 10% cold rolled steel was found to be more corrosion resistance than other in air oxidation for 50 cycles.

关键词： Hot corrosion cold rolling cyclic oxidation.