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Clean technological machining operations can improve traditional methods’ environmental, economic, and technical viability, resulting in sustainability, compatibility, and human-centered machining. This, this work focuses on sustainable machining of Al-Mg-Zr alloy with minimum quantity lubricant (MQL)-assisted machining using a polycrystalline diamond (PCD) tool. The effect of various process parameters on the surface roughness and cutting temperature were analyzed. The Taguchi L25 orthogonal array-based experimental design has been utilized. Experiments have been carried out in the MQL environment, and pressure was maintained at 8 bar. The multiple responses were optimized using desirability function analysis (DFA). Analysis of variance (ANOVA) shows that cutting speed and depth of cut are the most prominent factors for surface roughness and cutting temperature. Therefore, the DFA suggested that, to attain reasonable response values, a lower to moderate value of depth of cut, cutting speed and feed rate are appreciable. An artificial neural network (ANN) model with four different learning algorithms was used to predict the surface roughness and temperature. Apart from this, to address the sustainability aspect, life cycle assessment (LCA) of MQL-assisted and dry machining has been carried out. Energy consumption, CO2 emissions, and processing time have been determined for MQL-assisted and dry machining. The results showed that MQL-machining required a very nominal amount of cutting fluid, which produced a smaller carbon footprint. Moreover, very little energy consumption is required in MQL-machining to achieve high material removal and very low tool change.
Rezaul Karim; Juairiya Tariq; Shah Morshed; Sabbir Shawon; Abir Hasan; Chander Prakash; Sunpreet Singh; Raman Kumar; Yadaiah Nirsanametla; Catalin Pruncu. Environmental, Economical and Technological Analysis of MQL-Assisted Machining of Al-Mg-Zr Alloy Using PCD Tool. Sustainability 2021, 13, 7321 .
AMA StyleRezaul Karim, Juairiya Tariq, Shah Morshed, Sabbir Shawon, Abir Hasan, Chander Prakash, Sunpreet Singh, Raman Kumar, Yadaiah Nirsanametla, Catalin Pruncu. Environmental, Economical and Technological Analysis of MQL-Assisted Machining of Al-Mg-Zr Alloy Using PCD Tool. Sustainability. 2021; 13 (13):7321.
Chicago/Turabian StyleRezaul Karim; Juairiya Tariq; Shah Morshed; Sabbir Shawon; Abir Hasan; Chander Prakash; Sunpreet Singh; Raman Kumar; Yadaiah Nirsanametla; Catalin Pruncu. 2021. "Environmental, Economical and Technological Analysis of MQL-Assisted Machining of Al-Mg-Zr Alloy Using PCD Tool." Sustainability 13, no. 13: 7321.
Total knee replacement (TKR) is a remarkable achievement in biomedical science that enhances human life. However, human beings still suffer from knee-joint-related problems such as aseptic loosening caused by excessive wear between articular surfaces, stress-shielding of the bone by prosthesis, and soft tissue development in the interface of bone and implant due to inappropriate selection of TKR material. The choice of most suitable materials for the femoral component of TKR is a critical decision; therefore, in this research paper, a hybrid multiple-criteria decision-making (MCDM) tactic is applied using the degree of membership (DoM) technique with a varied system, using the weighted sum method (WSM), the weighted product method (WPM), the weighted aggregated sum product assessment method (WASPAS), an evaluation based on distance from average solution (EDAS), and a technique for order of preference by similarity to ideal solution (TOPSIS). The weights of importance are assigned to different criteria by the equal weights method (EWM). Furthermore, sensitivity analysis is conducted to check the solidity of the projected tactic. The weights of importance are varied using the entropy weights technique (EWT) and the standard deviation method (SDM). The projected hybrid MCDM methodology is simple, reliable and valuable for a conflicting decision-making environment.
Raman Kumar; Rohit Dubey; Sehijpal Singh; Sunpreet Singh; Chander Prakash; Yadaiah Nirsanametla; Grzegorz Królczyk; Roman Chudy. Multiple-Criteria Decision-Making and Sensitivity Analysis for Selection of Materials for Knee Implant Femoral Component. Materials 2021, 14, 2084 .
AMA StyleRaman Kumar, Rohit Dubey, Sehijpal Singh, Sunpreet Singh, Chander Prakash, Yadaiah Nirsanametla, Grzegorz Królczyk, Roman Chudy. Multiple-Criteria Decision-Making and Sensitivity Analysis for Selection of Materials for Knee Implant Femoral Component. Materials. 2021; 14 (8):2084.
Chicago/Turabian StyleRaman Kumar; Rohit Dubey; Sehijpal Singh; Sunpreet Singh; Chander Prakash; Yadaiah Nirsanametla; Grzegorz Królczyk; Roman Chudy. 2021. "Multiple-Criteria Decision-Making and Sensitivity Analysis for Selection of Materials for Knee Implant Femoral Component." Materials 14, no. 8: 2084.
Laser beam welding and electron beam welding are the most recent joining technologies that interface engineering and physics concepts. The present research work focuses on the comparison of the microstructural and mechanical performances of Ti6Al4V, an alloy that displays sensible weldability owing to high susceptibility to oxidation process at elevated temperature, welded joints by using laser and electron beam welding. The as-welded alloy has been examined to study the effect of similar heat input conditions and focal point positions on butt-joint Ti6Al4V specimens in response of the weld morphology, microstructural feature, micro-hardness distribution and angular deformation. The results indicated that electron beam welding process is more appropriate and favorable to join Ti6Al4V alloy specimens and full penetrated electron beam weld joint is procured without any defects. However, narrow weld seam with refined grain structures is developed in the weld zone of laser beam welded specimens. Also, defocusing the beam position by − 1 mm contributed to grain refinement in the weld zone of laser and electron beam welded specimens. Moreover, the magnitude of micro-hardness distribution in the weld zone of laser beam weldments is higher than electron beam weldments by 0.66 times. However, the micro-hardness magnitude is substantially enhanced by 32% and 16% for laser and electron beam weldments, respectively, due to negative defocusing beam position. From the results, it is determined that the magnitude of angular deflection is higher for laser beam weldments than electron beam weldments due to higher difference in fusion zone areas across the neutral axis. Moreover, angular deflection magnitude in electron and laser beam weldments is lowered by 15.8% and 7.4%, respectively, due to negative defocusing beam position.
Sohini Chowdhury; N. Yadaiah; M. Murlidhar; Deepati Anil Kumar; C. P. Paul; S. K. Patra; Sunpreet Singh; Grzegorz Królczyk; Chander Prakash. Comparison of microstructure and mechanical performance of laser and electron beam welded Ti6Al4V alloy. Journal of the Brazilian Society of Mechanical Sciences and Engineering 2021, 43, 1 -12.
AMA StyleSohini Chowdhury, N. Yadaiah, M. Murlidhar, Deepati Anil Kumar, C. P. Paul, S. K. Patra, Sunpreet Singh, Grzegorz Królczyk, Chander Prakash. Comparison of microstructure and mechanical performance of laser and electron beam welded Ti6Al4V alloy. Journal of the Brazilian Society of Mechanical Sciences and Engineering. 2021; 43 (3):1-12.
Chicago/Turabian StyleSohini Chowdhury; N. Yadaiah; M. Murlidhar; Deepati Anil Kumar; C. P. Paul; S. K. Patra; Sunpreet Singh; Grzegorz Królczyk; Chander Prakash. 2021. "Comparison of microstructure and mechanical performance of laser and electron beam welded Ti6Al4V alloy." Journal of the Brazilian Society of Mechanical Sciences and Engineering 43, no. 3: 1-12.
Investigation of the selective laser melting (SLM) process, using finite element method, to understand the influences of laser power and scanning speed on the heat flow and melt-pool dimensions is a challenging task. Most of the existing studies are focused on the study of thin layer thickness and comparative study of same materials under different manufacturing conditions. The present work is focused on comparative analysis of thermal cycles and complex melt-pool behavior of a high layer thickness multi-layer laser additive manufacturing (LAM) of pure Titanium (Ti) and Inconel 718. A transient 3D finite-element model is developed to perform a quantitative comparative study on two materials to examine the temperature distribution and disparities in melt-pool behaviours under similar processing conditions. It is observed that the layers are properly melted and sintered for the considered process parameters. The temperature and melt-pool increases as laser power move in the same layer and when new layers are added. The same is observed when the laser power increases, and opposite is observed for increasing scanning speed while keeping other parameters constant. It is also found that Inconel 718 alloy has a higher maximum temperature than Ti material for the same process parameter and hence higher melt-pool dimensions.
Sapam Ningthemba Singh; Sohini Chowdhury; Yadaiah Nirsanametla; Anil Kumar Deepati; Chander Prakash; Sunpreet Singh; Linda Yongling Wu; Hongyu Y. Zheng; Catalin Pruncu. A Comparative Analysis of Laser Additive Manufacturing of High Layer Thickness Pure Ti and Inconel 718 Alloy Materials Using Finite Element Method. Materials 2021, 14, 876 .
AMA StyleSapam Ningthemba Singh, Sohini Chowdhury, Yadaiah Nirsanametla, Anil Kumar Deepati, Chander Prakash, Sunpreet Singh, Linda Yongling Wu, Hongyu Y. Zheng, Catalin Pruncu. A Comparative Analysis of Laser Additive Manufacturing of High Layer Thickness Pure Ti and Inconel 718 Alloy Materials Using Finite Element Method. Materials. 2021; 14 (4):876.
Chicago/Turabian StyleSapam Ningthemba Singh; Sohini Chowdhury; Yadaiah Nirsanametla; Anil Kumar Deepati; Chander Prakash; Sunpreet Singh; Linda Yongling Wu; Hongyu Y. Zheng; Catalin Pruncu. 2021. "A Comparative Analysis of Laser Additive Manufacturing of High Layer Thickness Pure Ti and Inconel 718 Alloy Materials Using Finite Element Method." Materials 14, no. 4: 876.
Electron beam welding process is one such advanced fusion welding technique that fabricates structural parts with high dimensional precision and induces minimum thermal stresses and distortion. However, with incorporation of tack procedure prior to full pass electron beam welding process the effect of distortion and stresses in welded parts is lowered significantly. In the present work, an attempt has been made to investigate the effect of incorporation and elimination of tack operation prior to full pass electron beam welding process in 5 mm thick butt-jointed Ti6Al4V alloy plates. The influence of electron beam current is analyzed for tack and full pass electron beam welding procedures with an aim to produce full penetrated defect free weld joint. The characteristics difference in terms of macro and microstructural properties, microhardness distribution and welding induced angular deformation is evaluated for electron beam welded specimens. It is found that the weld width, undercut defect, and angular deformation was reduced by 7.6%, 4.2%, and 22%, respectively due to incorporation of tack procedure prior to full pass welding operation. The refined martensitic phases were observed in the fusion zone of tack welded specimens due to solidification process which enhanced the hardness of the joints. Moreover, finite element results revealed that induced thermal stresses are highly localized and longitudinal stress is more prominent across the weld joint. The angular deflection and plastic strain magnitude is estimated to be lower in specimens that are joined initially with tack operation. Moreover, the numerically computed angular deflection magnitude validates well with the experimentally measured deflection values.
Sohini Chowdhury; N. Yadaiah; D. Anil Kumar; M. Murlidhar; C.P. Paul; Chander Prakash; Grzegorz Królczyk; Alokesh Pramanik. Influence of tack operation on metallographic and angular distortion in electron beam welding of Ti-6l-4V alloy. Measurement 2021, 175, 109160 .
AMA StyleSohini Chowdhury, N. Yadaiah, D. Anil Kumar, M. Murlidhar, C.P. Paul, Chander Prakash, Grzegorz Królczyk, Alokesh Pramanik. Influence of tack operation on metallographic and angular distortion in electron beam welding of Ti-6l-4V alloy. Measurement. 2021; 175 ():109160.
Chicago/Turabian StyleSohini Chowdhury; N. Yadaiah; D. Anil Kumar; M. Murlidhar; C.P. Paul; Chander Prakash; Grzegorz Królczyk; Alokesh Pramanik. 2021. "Influence of tack operation on metallographic and angular distortion in electron beam welding of Ti-6l-4V alloy." Measurement 175, no. : 109160.
Titanium-based Ti6Al4V alloy and SS 316L are most widely used materials in the manufacturing industry. Also, recent developments in fiber lasers offer remarkable benefits for welding of titanium and stainless steel alloys on account of high processing ability and accuracy. Moreover, identification of conduction and keyhole mode welding during fiber laser welding process is a promising task. Therefore, aim of the present work is identification of weld limits viz, conduction, transition and keyhole in Ti6Al4V alloy and SS 316L welds with respect to fundamental dimensional and non-dimensional parameters. Also, the influence of laser welding process variables and thermal physical properties of Ti6Al4V alloy and SS 316L welds are investigated using linear energy, laser interaction energy and absorbed heat flux. Moreover, the effect of non-dimensional numbers viz. melting efficiency, non-dimensional heat input index, non-dimensional linear energy, Marangoni number and Fourier number are examined. The non-dimensional numbers correlated the combined effect of laser welding process variables and alloy properties with thermal and fluid flow characteristics to analyze its impact on weld pool development. And, evaluation of weld characteristics in definitive weld regimes relative to dimensional and non-dimensional numbers. Moreover, macro and micro-structural analysis and micro-hardness estimation is carried out at distinct weld regimes to examine the weld behaviour.
Sohini Chowdhury; Yadaiah Nirsanametla; M. Muralidhar; Swarup Bag; C.P. Paul; K.S. Bindra. Identification of modes of welding using parametric studies during ytterbium fiber laser welding. Journal of Manufacturing Processes 2020, 57, 748 -761.
AMA StyleSohini Chowdhury, Yadaiah Nirsanametla, M. Muralidhar, Swarup Bag, C.P. Paul, K.S. Bindra. Identification of modes of welding using parametric studies during ytterbium fiber laser welding. Journal of Manufacturing Processes. 2020; 57 ():748-761.
Chicago/Turabian StyleSohini Chowdhury; Yadaiah Nirsanametla; M. Muralidhar; Swarup Bag; C.P. Paul; K.S. Bindra. 2020. "Identification of modes of welding using parametric studies during ytterbium fiber laser welding." Journal of Manufacturing Processes 57, no. : 748-761.
Additive manufacturing (AM) is making significant progresses among the research communities as well as in the manufacturing world. Though AM process has the provision of design flexibility, simplification of manufacturing in terms of tooling and scheduling one of the major constraints of AM process is processing time. This chapter discusses the details of AM process and advances in biomedical applications. A 3D transient FEM-based approach is utilized to analyze the influence of laser power and scanning velocity for a laser-based AM process on Inconel 718 alloy having high layer thickness. The temperature-dependent material properties, appropriate boundary conditions and Gaussian-distributed heat source model are incorporated in the process model. Moreover, element’s death and birth feature is used to achieve the addition of new layers during the manufacturing. The evolution of melt-pool as well as the heat flow is discussed in detail in a multi-layer laser-based AM process. The melt-pool dimension increases as the process continues over the successive layers. It is found that maximum temperature and melt-pool dimensions increase with the increase of laser power, while the opposite is observed when the scanning velocity is enhanced. The optimum combination of laser power and scanning velocity results in proper melting and sintering of layers even at high layer thicknesses.
Sapam Ningthemba Singh; Yadaiah Nirsanametla; Sohini Chowdhury; M. Muralidhar. Influence of Laser Power and Scan Speed During Laser-Assisted Multi-layer Additive Manufacturing Using Finite Element Modeling. Green Organic Reactions 2020, 289 -316.
AMA StyleSapam Ningthemba Singh, Yadaiah Nirsanametla, Sohini Chowdhury, M. Muralidhar. Influence of Laser Power and Scan Speed During Laser-Assisted Multi-layer Additive Manufacturing Using Finite Element Modeling. Green Organic Reactions. 2020; ():289-316.
Chicago/Turabian StyleSapam Ningthemba Singh; Yadaiah Nirsanametla; Sohini Chowdhury; M. Muralidhar. 2020. "Influence of Laser Power and Scan Speed During Laser-Assisted Multi-layer Additive Manufacturing Using Finite Element Modeling." Green Organic Reactions , no. : 289-316.
A thorough understanding of laser-based additive manufacturing process and effect of various process variables such as scanning velocity and laser beam power on melt-pool dimensions and temperature variation is a promising task in design and manufacture of an able product. The present work is focused on comprehending the thermal and melt-pool behavior of a high layer thickness five-layer laser additive manufacturing of Ti–6Al–4V alloy quantitatively. A three-dimensional (3D) nonlinear transient thermal model is developed based on a finite element procedure to simulate single- and multi-layer of Ti–6Al–4V alloy and to estimate melt-pool dimensions and thermal cycles. In this work, temperature-dependent material properties and Gaussian distributed ‘disk’ heat source model are implemented along with actual process boundary and initial conditions. Also, the influence of laser beam power and laser scanning velocity was examined with respect to melt-pool characteristics and thermal cycles. The laser scanning velocity ranges from 200 to 500 mm s−1 and laser beam power from 100 to 400 W are examined. It is observed that the temperature rises for successive layers as the laser power supply continues on consecutive layers. Also, it is obvious that with the rise in temperature, melt-pool dimensions also increase. Furthermore, the melt-pool dimensions increase as the number of deposited layers increases. Time–temperature history and melt-pool evolution in different layers with respect to laser beam power and laser scanning velocity are presented. To verify the effectiveness of the developed model, simulated results are compared with experimentally measured melt-pool profiles and dimensions. A fair agreement between experimental results and computed values is achieved.
Sapam Ningthemba Singh; Sohini Chowdhury; S. Mujaheed Khan; Manapuram Muralidhar; Yadaiah Nirsanametla. FE-Based Heat Transfer Analysis of Laser Additive Manufacturing on Ti–6Al–4V Alloy. Smart Technologies for Energy, Environment and Sustainable Development 2019, 381 -392.
AMA StyleSapam Ningthemba Singh, Sohini Chowdhury, S. Mujaheed Khan, Manapuram Muralidhar, Yadaiah Nirsanametla. FE-Based Heat Transfer Analysis of Laser Additive Manufacturing on Ti–6Al–4V Alloy. Smart Technologies for Energy, Environment and Sustainable Development. 2019; ():381-392.
Chicago/Turabian StyleSapam Ningthemba Singh; Sohini Chowdhury; S. Mujaheed Khan; Manapuram Muralidhar; Yadaiah Nirsanametla. 2019. "FE-Based Heat Transfer Analysis of Laser Additive Manufacturing on Ti–6Al–4V Alloy." Smart Technologies for Energy, Environment and Sustainable Development , no. : 381-392.
This work focuses on examining the influence of welding parameters under different welding atmospheres and evaluation of keyhole profile during fiber laser welding operation. The experiments are carried out in two different welding atmospheres, namely self-protected atmosphere of Ar gas and open atmospheric conditions. The effect of these two atmospheric conditions on weld profile formation and dimensions, and microstructural evolution for SS 316 plates are examined. In addition, the keyhole profile is evaluated by using a semi-analytical mathematical model, a point-by-point energy balance determination at the keyhole wall, which is mapped with experimentally measured weld macrographs for similar welding conditions. It has been determined that the weld quality is profound in the case of a self-protected atmosphere with respect to aspect ratio, weld defects, and microstructural characterization. Moreover, better weld bead profile and cleaner weld seam on the upper surface is determined in samples welded in a self-protected atmosphere.
Sohini Chowdhury; Yadaiah Nirsanametla; Muralidhar Manapuram. Investigation on keyhole mode fiber laser welding of SS 316 in a self-protected atmosphere. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 2019, 233, 6602 -6615.
AMA StyleSohini Chowdhury, Yadaiah Nirsanametla, Muralidhar Manapuram. Investigation on keyhole mode fiber laser welding of SS 316 in a self-protected atmosphere. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science. 2019; 233 (18):6602-6615.
Chicago/Turabian StyleSohini Chowdhury; Yadaiah Nirsanametla; Muralidhar Manapuram. 2019. "Investigation on keyhole mode fiber laser welding of SS 316 in a self-protected atmosphere." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 18: 6602-6615.
Electron beam welding (EBW) is the most preferable and efficient joining technique to weld titanium alloys, since it provides a vacuum atmosphere and eliminates the use of shielding gas during the welding process. The present work is focused on understanding the electron beam weld parameters which controls the weld limits, microstructural and mechanical properties and vaporization rate of metal elements in the Ti6Al4V alloy. The influence of power density on characteristics of electron beam welded Ti6Al4V alloy at constant linear energy conditions is examined. The welding experiments were performed to evaluate the weld geometry, weld regimes, microstructural properties and microhardness characteristics using fundamental parameters such as power density and interaction energy per unit volume (IE). Moreover, the vaporization heat transfer model of the EBW process is developed by employing Fourier’s law of heat conduction to estimate the vaporization rate of Ti6Al4V alloying elements. The rate of vaporization of major alloying elements of Ti6Al4V is analysed with respect to power density. Based upon the results obtained, it is witnessed that the weld bead geometry, weld limits and grain size are controlled by power density for constant linear energy conditions. Also, the solidified microstructure in the weld zone at different power density significantly effects the final strength of the weld joint. The conduction and keyhole weld limits are identified for power density values below 0.31 W cm−2 and above 2.12 W cm−2, respectively. The transition mode welding in the Ti6Al4V alloy is identified by a nominal increase in aspect ratio for a wide range of power density and IE values. The results also established that the size of β grain in the fusion zone reduces with increase in power density at constant linear energy condition. Also, the average α1 martensitic grain size in the weld zone is determined to be higher in keyhole welds (128 µm) relative to conduction welds (48 µm) on account of higher solidification rate. In effect, the solidified martensitic phases influence the microhardness distribution proportionately across the weld sample of Ti6Al4V alloy. Vaporization of metal elements of the Ti6Al4V alloy is induced in few milliseconds and evaporation rate of ‘Al’ element is least followed by ‘Ti’ and ‘V’ elements. It is also observed that by reducing the power density from 2.54 to 2.12 W cm−2, keyhole mode welding can be acquired and vaporization rate of ‘Al’ is reduced by 20.5%.
Sohini Chowdhury; Yadaiah Nirsanametla; M. Muralidhar; Swarup Bag; S. K. Patra. Influence of weld parameters on weld regimes and vaporization rate in electron beam welding of Ti6Al4V alloy. Journal of the Brazilian Society of Mechanical Sciences and Engineering 2019, 41, 180 .
AMA StyleSohini Chowdhury, Yadaiah Nirsanametla, M. Muralidhar, Swarup Bag, S. K. Patra. Influence of weld parameters on weld regimes and vaporization rate in electron beam welding of Ti6Al4V alloy. Journal of the Brazilian Society of Mechanical Sciences and Engineering. 2019; 41 (4):180.
Chicago/Turabian StyleSohini Chowdhury; Yadaiah Nirsanametla; M. Muralidhar; Swarup Bag; S. K. Patra. 2019. "Influence of weld parameters on weld regimes and vaporization rate in electron beam welding of Ti6Al4V alloy." Journal of the Brazilian Society of Mechanical Sciences and Engineering 41, no. 4: 180.
Titanium based alloy Ti2AlNb is considered as a formidable structural material for advanced aero-engine applications due to its low density and high melting point temperature. Moreover, titanium based Ti2AlNb alloy is reactive towards atmospheric elements at an elevated temperature and hence conventional welding techniques do not fit to weld this type of materials. Furthermore, electron beam (EB) welding process is preferable to join Ti2AlNb alloy as it provides vacuum environment and possess high energy density with relatively minimum thermal input. EB welding produces deep and narrow penetration welds which leads to minimum weld induced stresses and distortion. In the recent past, several experimental analysis have been presented to comprehend the weld pool geometry during fusion welding procedures. Moreover, the phenomenological occurrence within and vicinity of the molten weld zone are primary focus of analysis. Therefore, a three-dimensional (3D) numerical model is paramount to interpret the physical occurrence of welding operation using a suitable volumetric heat source model. Nevertheless, in the current investigation, a transient heat transfer model based on finite element (FE) method is developed to simulate electron beam welds of titanium based Ti2AlNb alloy. In the course of modeling, a suitable thermal model is selected based on weldment profile and is quite accountable for determining accuracy of heat transfer analysis. The authors have considered a composite heat source model, comprising of two dimensional Gaussian distributed double ellipsoidal heat source at the top section and volumetric conical heat source through thickness of the cross section. Along with composite heat source model; material properties and latent heat of fusion as a function of temperature have been incorporated during modeling. The developed numerical heat transfer process model predicts the time-temperature history, cooling rates, weld bead dimensions and shapes. To verify the effectiveness of developed process model, the computed results are evaluated with experimentally estimated weld bead dimensions and profile. The numerical results indicated that the weld geometry characteristics and thermal history are in good accordance with the experimental data with less than 6% error. Moreover, the computed FE model results lays foundation for the estimation of welding induced distortion and residual stresses further.
Sohini Chowdhury; Yadaiah Nirsanametla; Manapuram Muralidhar. Finite Element Based Transient Heat Transfer Analysis of Ti2AlNb Electron Beam Welds Using Hybrid Volumetric Heat Source. Indian Welding Journal 2019, 52, 49 .
AMA StyleSohini Chowdhury, Yadaiah Nirsanametla, Manapuram Muralidhar. Finite Element Based Transient Heat Transfer Analysis of Ti2AlNb Electron Beam Welds Using Hybrid Volumetric Heat Source. Indian Welding Journal. 2019; 52 (1):49.
Chicago/Turabian StyleSohini Chowdhury; Yadaiah Nirsanametla; Manapuram Muralidhar. 2019. "Finite Element Based Transient Heat Transfer Analysis of Ti2AlNb Electron Beam Welds Using Hybrid Volumetric Heat Source." Indian Welding Journal 52, no. 1: 49.
In fusion welding, thermo-chemical reactions may take place among surrounding atmosphere particles and molten weld pool at high temperature gradients. The atmosphere particles such as oxygen, hydrogen and nitrogen may become part of final weld joint that severely affects the weld joint quality and weld metal properties. Therefore, the welding atmosphere and protection of weld pool plays a noticeable role on the quality of the final weld joint. Henceforth, in this chapter, fiber laser welding of austenitic stainless steel plates have been examined in two different ambient atmospheres. Firstly, the experiments are conducted in open atmosphere and in argon ambient atmosphere to study the characteristic difference between them. The experimental investigation specifies that the weld bead dimensions and aspect ratio are higher in case of argon atmosphere as compared to open atmosphere. The microstructures of heat affected zone (HAZ) and fusion zone (FZ) at both atmospheric conditions are analyzed. It is obvious from the experimental results that the top surface profile is smoother and very clear in case of welds at argon atmosphere. Moreover, in this work, the authors also reported an efficient conduction mode finite element based heat transfer model of linear fiber laser welding process using a volumetric heat source. The calculated weld bead dimensions using finite element model are compared with the experimentally measured results at similar process variables. Relatively fair agreement of the experimental results with model results entitles the robustness of the modeling approach followed here and reported in this work.
Yadaiah Nirsanametla; Swarup Bag; C. P. Paul; L. M. Kukreja. Fiber Laser Welding in a Controlled Inert Gas Atmosphere: An Experimental and Numerical Investigation. Operations and Basic Processes in Steelmaking 2015, 399 -419.
AMA StyleYadaiah Nirsanametla, Swarup Bag, C. P. Paul, L. M. Kukreja. Fiber Laser Welding in a Controlled Inert Gas Atmosphere: An Experimental and Numerical Investigation. Operations and Basic Processes in Steelmaking. 2015; ():399-419.
Chicago/Turabian StyleYadaiah Nirsanametla; Swarup Bag; C. P. Paul; L. M. Kukreja. 2015. "Fiber Laser Welding in a Controlled Inert Gas Atmosphere: An Experimental and Numerical Investigation." Operations and Basic Processes in Steelmaking , no. : 399-419.
N. Yadaiah; S. Bag. Development of egg-configuration heat source model in numerical simulation of autogenous fusion welding process. International Journal of Thermal Sciences 2014, 86, 125 -138.
AMA StyleN. Yadaiah, S. Bag. Development of egg-configuration heat source model in numerical simulation of autogenous fusion welding process. International Journal of Thermal Sciences. 2014; 86 ():125-138.
Chicago/Turabian StyleN. Yadaiah; S. Bag. 2014. "Development of egg-configuration heat source model in numerical simulation of autogenous fusion welding process." International Journal of Thermal Sciences 86, no. : 125-138.
Yadaiah Nirsanametla. Efficient Finite Element Modeling of Fiber Laser Welding Processunder Conduction Regime on 316 Stainless SteelPlate. International Journal of Current Engineering and Technology 2010, 2, 31 -36.
AMA StyleYadaiah Nirsanametla. Efficient Finite Element Modeling of Fiber Laser Welding Processunder Conduction Regime on 316 Stainless SteelPlate. International Journal of Current Engineering and Technology. 2010; 2 (2):31-36.
Chicago/Turabian StyleYadaiah Nirsanametla. 2010. "Efficient Finite Element Modeling of Fiber Laser Welding Processunder Conduction Regime on 316 Stainless SteelPlate." International Journal of Current Engineering and Technology 2, no. 2: 31-36.