Particle swarm optimisation in designing parameters of manufacturing processes: A review (2008–2018)

Complete combustion in a furnace must be achieved to reduce the emissions. In order to achieve the same, this work focuses on the optimization of performance parameters of centrifugal blower for complete combustion in the furnace with the aid of one the optimization techniques, i.e., Taguchi-based grey relational analysis. The type of blade and percentage of the opening of the blower duct is selected as input parametric characteristics. For experimental design, tests are planned based on Taguchi’s L12 orthogonal array and by conducting experiments as design, the output process parameters i.e. velocity, discharge, input power, output power, and mechanical efficiency are calculated and found the operating settings of the blower by manipulating grey relational grade with Taguchi optimization technique. The test results propose that the type of blade has the most noteworthy impact on the multiple performance qualities rather than the percentage of the opening of duct and blower with a backward blade and 50% opening of duct shows the best-operating conditions.

Optimizing Performance Characteristics of Blower for Combustion Process Using Taguchi Based Grey Relational Analysis

Welding processes are characterised as a multi-input processes. Selection of optimum combination of process parameters of a welding process is a vital task in order to achieve high quality of weld ...

Optimisation of welding processes using quasi-oppositional-based Jaya algorithm

Particle Swarm Optimization approach for waterjet cavitation peening

Effect of beam oscillation on the evolution of microstructure and its correlation to mechanical properties for butt-welded Ti-6Al-4V plates has been studied using electron beam welding. Joints made with oscillating beam demonstrated higher ductility (by 10 to 15%) and notch toughness (by 20 to 30%) compared to those produced by non-oscillating beam. Evolution of such improved mechanical properties with beam oscillation has been corroborated with more uniform and fine microstructure, which has been attributed to the intense heat mixing, reduced temperature gradient, and more uniform cooling in the weld track. Narrow heat-affected zone and fusion zone with considerably reduced undercut depth were also obtained for oscillating beam joints. Interestingly, residual stress was found to be more in welds prepared with beam oscillation than its non-oscillating counterparts, although the magnitude of such stress irrespective of the welding condition was found to be much lower than those reported for arc welding.

Influence of beam oscillation in electron beam welding of Ti-6AL-4V

Precipitation-hardened Cu-0.804Cr-0.063Zr alloy is a potential material to be used for the fabrication of heat sinks in International Thermonuclear Experimental Reactor (ITER) applications. The softening temperature of these alloys is 500 °C, which makes it suitable for the fabrication of components subjected to high heat flux. During welding, the precipitates get completely dissolved in the melted zone, which results in lower hardness and softening temperature. The aim of this study was to understand the effects of electron beam welding (EBW) on weld bead geometry and mechanical properties of this alloy. Accelerating voltage, beam current, welding speed, and focusing distance were selected as input variables, and bead geometric parameters like bead width, bead penetration, and microhardness values of the fusion and heat-affected zones were considered as outputs. Statistical regression analysis was conducted to determine input-output relationships. All the above input parameters were found to have significant contributions toward bead penetration and microhardness of fusion zone. However, accelerating voltage did not have significant contribution toward bead width. Optimization was done to obtain minimum weldment area after satisfying the conditions of maximum bead penetration and minimum deviation of the hardness of fusion zone from that of parent material. This constrained optimization problem was solved using a genetic algorithm along with a penalty function approach for handling the functional constraints. A good agreement was obtained between the results predicted by the optimization tool and that of real experiments. Thus, the genetic algorithm (GA) could accurately establish input-output relationships of this process.

Experimental investigations, input-output modeling and optimization for electron beam welding of Cu-Cr-Zr alloy plates

Experimental investigations, input-output modeling, and optimization of spiking phenomenon in electron beam welding of ETP copper plates

Electron beam butt welding of Cu-Cr-Zr alloy plates: Experimental investigations, studies on metallurgical and mechanical properties

In this study, the effects of electron beam welding on the microstructure, microhardness, and electrical conductivity of precipitation-hardened Cu-0.804%Cr-0.063%Zr (wt.%) alloy plates were investigated. Experiments were carried out following a central composite design of experiments. Five welding schedules yielding the higher hardness were chosen and then were subjected to standard metallographic and various microscopy techniques to reveal the type, morphology, and distribution of the precipitates and to obtain the sub-structural information from the weld zone. X-ray diffraction studies revealed predominant formation of intermetallic phases in the welded zones of some of the samples, which could have resulted in higher hardness and better electrical conductivity compared to those of other ones. Microhardness values in the fusion zone and heat-affected zone were found to be less than that of the parent material. The mechanism of damage in Cu-Cr-Zr plates due to welding was also explained.

P.K.C. Kanigalpula

Papers

Experimental investigations, input-output modeling and optimization for electron beam welding of Cu-Cr-Zr alloy plates

Experimental investigations, input-output modeling, and optimization of spiking phenomenon in electron beam welding of ETP copper plates

Electron beam butt welding of Cu-Cr-Zr alloy plates: Experimental investigations, studies on metallurgical and mechanical properties

Effects of Electron Beam Welding on Microstructure, Microhardness, and Electrical Conductivity of Cu-Cr-Zr Alloy Plates

Electron beam welding of precipitation hardened CuCrZr alloy: Modeling and experimentation