lokesh boriwal | Maulana Azad National Institute of Technology (original) (raw)

Papers by lokesh boriwal

Research paper thumbnail of Process analysis and regression modelling of resistance spot welded joints of austenitic stainless steel 304L and low carbon steel sheets by using surface response methodology

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering

Evaluating the strength performance of spot-welded joints of dissimilar material is critical for ... more Evaluating the strength performance of spot-welded joints of dissimilar material is critical for their continued integration into the automobile and aerospace industries. The effect of weld joint strength is an important consideration in the design of weld structures. The objective of the present work undertaken to investigate the effect of the input process parameters on the strength of the welded joint of dissimilar material. Full factorial design (FFD) has used for designing the experiment matrix. Further, experimental results have used to develop a mathematical model to predict the strength of the spot weld joint. Analysis of Variance (ANOVA) has been applied to establish the correlation between the process parameters and their interaction on the output. The confirmation test case experiments have conducted for validating the developed mathematical model and observed that the developed model is capable of evaluating weld joint strength within the process parameters.

Research paper thumbnail of Experimental investigation on influence of ECM process parameters on responses using full factorial design

Materials Today: Proceedings, 2017

Research paper thumbnail of Performance Analysis of Water Cooled Thermoelectric Module TEC- 12715

International Journal of Engineering Research and, 2017

Thermoelectric refrigeration system uses peltier effect to produce hot and cold ends at each of i... more Thermoelectric refrigeration system uses peltier effect to produce hot and cold ends at each of its junctions. Cold end is kept inside the cabinet to produce cooling effect inside that cabinet. Thermoelectric device can work either as a refrigeration system or as heat pump. This work presents an analysis of variation of temperature with respect to time for water cooled thermoelectric assembly. Here TEC-12715 thermoelectric module was used for cooling the refrigeration cabinet. The current was varied from 5A to 11A and time was noted for temperature to drop from ambient temperature to 10-15°C.Results showed that maximum decrease in temperature of polystyrene cabinet was observed when I=0.5Imax.

Research paper thumbnail of Modelling and Simulation of Temperature and Stress Analysis in TIG Welding Process

Materials Science Forum, 2015

In this study, the welding process is modelled and analysed using ANSYS software. The temperature... more In this study, the welding process is modelled and analysed using ANSYS software. The temperature and residual stress produced during the process is depicted. During heating, the material conditions, parts affected by residual stress and the stress–strain state at different time interval is recorded and a subsequent structural analysis is used for the analysis, the same is used in the analysis where thermal and structural results are investigated. Subsequently, with sensitivity analysis the results are evaluated. Non-uniform meshing is used to entrap the result with fine mesh in the heat affected zone and coarse mesh away from it to save processing time. The results from the thermal structural analysis are presented to understand the process deeply and comparison of the graph plot between temperature and time is explained.

Research paper thumbnail of Modelling and Simulation of Temperature and Stress Analysis in TIG Welding Process

In this study, the welding process is modelled and analysed using ANSYS, finite element analysis ... more In this study, the welding process is modelled and analysed using ANSYS, finite element analysis software. The temperature and residual stress produced during the process is depicted. During heating, the material conditions, parts affected by residual stress and the stress–strain state at different time interval is recorded and a subsequent structural analysis is used for the analysis, the same is used in the analysis where thermal and structural results are investigated. Subsequently, with sensitivity analysis the results are evaluated. Non-uniform meshing is used to entrap the result with fine mesh in the heat affected zone and coarse mesh away from it to save processing time. The results from the thermal-structural analysis are presented to understand the process deeply and comparison of the graph plot between temperature and time is explained thoroughly.

Research paper thumbnail of Modelling and optimizing the effects of process parameters on galvanized steel sheet resistance spot Welds

This paper investigates the choice of input process variables that create acceptable welds in the... more This paper investigates the choice of input process variables that create acceptable
welds in the resistance spot welding of galvanized steel sheets. The effects created by the
interactions between the process variables in terms of the size of the weld nugget, tensileshear
strength, and peel strength are also investigated. Regression equations are obtained and
their ability to predict the size of the weld nugget, tensile-shear strength, and peel strength is
tested in a series of test cases. The obtained data is then used in response optimization studies.
The predicted optimized input process variables were experimentally verified by comparing
measured and predicted optimized target responses. The methodology adopted in the
present investigation is shown to be able to model, predict, and response optimize the input
process variables for resistance spot welding of galvanized steel sheets.

Research paper thumbnail of Process analysis and regression modelling of resistance spot welded joints of austenitic stainless steel 304L and low carbon steel sheets by using surface response methodology

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering

Evaluating the strength performance of spot-welded joints of dissimilar material is critical for ... more Evaluating the strength performance of spot-welded joints of dissimilar material is critical for their continued integration into the automobile and aerospace industries. The effect of weld joint strength is an important consideration in the design of weld structures. The objective of the present work undertaken to investigate the effect of the input process parameters on the strength of the welded joint of dissimilar material. Full factorial design (FFD) has used for designing the experiment matrix. Further, experimental results have used to develop a mathematical model to predict the strength of the spot weld joint. Analysis of Variance (ANOVA) has been applied to establish the correlation between the process parameters and their interaction on the output. The confirmation test case experiments have conducted for validating the developed mathematical model and observed that the developed model is capable of evaluating weld joint strength within the process parameters.

Research paper thumbnail of Experimental investigation on influence of ECM process parameters on responses using full factorial design

Materials Today: Proceedings, 2017

Research paper thumbnail of Performance Analysis of Water Cooled Thermoelectric Module TEC- 12715

International Journal of Engineering Research and, 2017

Thermoelectric refrigeration system uses peltier effect to produce hot and cold ends at each of i... more Thermoelectric refrigeration system uses peltier effect to produce hot and cold ends at each of its junctions. Cold end is kept inside the cabinet to produce cooling effect inside that cabinet. Thermoelectric device can work either as a refrigeration system or as heat pump. This work presents an analysis of variation of temperature with respect to time for water cooled thermoelectric assembly. Here TEC-12715 thermoelectric module was used for cooling the refrigeration cabinet. The current was varied from 5A to 11A and time was noted for temperature to drop from ambient temperature to 10-15°C.Results showed that maximum decrease in temperature of polystyrene cabinet was observed when I=0.5Imax.

Research paper thumbnail of Modelling and Simulation of Temperature and Stress Analysis in TIG Welding Process

Materials Science Forum, 2015

In this study, the welding process is modelled and analysed using ANSYS software. The temperature... more In this study, the welding process is modelled and analysed using ANSYS software. The temperature and residual stress produced during the process is depicted. During heating, the material conditions, parts affected by residual stress and the stress–strain state at different time interval is recorded and a subsequent structural analysis is used for the analysis, the same is used in the analysis where thermal and structural results are investigated. Subsequently, with sensitivity analysis the results are evaluated. Non-uniform meshing is used to entrap the result with fine mesh in the heat affected zone and coarse mesh away from it to save processing time. The results from the thermal structural analysis are presented to understand the process deeply and comparison of the graph plot between temperature and time is explained.

Research paper thumbnail of Modelling and Simulation of Temperature and Stress Analysis in TIG Welding Process

In this study, the welding process is modelled and analysed using ANSYS, finite element analysis ... more In this study, the welding process is modelled and analysed using ANSYS, finite element analysis software. The temperature and residual stress produced during the process is depicted. During heating, the material conditions, parts affected by residual stress and the stress–strain state at different time interval is recorded and a subsequent structural analysis is used for the analysis, the same is used in the analysis where thermal and structural results are investigated. Subsequently, with sensitivity analysis the results are evaluated. Non-uniform meshing is used to entrap the result with fine mesh in the heat affected zone and coarse mesh away from it to save processing time. The results from the thermal-structural analysis are presented to understand the process deeply and comparison of the graph plot between temperature and time is explained thoroughly.

Research paper thumbnail of Modelling and optimizing the effects of process parameters on galvanized steel sheet resistance spot Welds

This paper investigates the choice of input process variables that create acceptable welds in the... more This paper investigates the choice of input process variables that create acceptable
welds in the resistance spot welding of galvanized steel sheets. The effects created by the
interactions between the process variables in terms of the size of the weld nugget, tensileshear
strength, and peel strength are also investigated. Regression equations are obtained and
their ability to predict the size of the weld nugget, tensile-shear strength, and peel strength is
tested in a series of test cases. The obtained data is then used in response optimization studies.
The predicted optimized input process variables were experimentally verified by comparing
measured and predicted optimized target responses. The methodology adopted in the
present investigation is shown to be able to model, predict, and response optimize the input
process variables for resistance spot welding of galvanized steel sheets.