Multiobjective optimal design of friction stir welding considering quality and cost issues

Abstract

Because of the high complexity in microstructure evolution in friction stir welding, it becomes very difficult to design optimal welding parameters. To solve this problem, in the current paper, soft computing based data driven models are developed to provide accurate and instant predictions for the welding process, and a multiobjective optimisation approach is employed to find optimal solutions to achieve the desired quality and economic objectives. The current work studies the aluminium AA5083-O as an example, where not only weld quality and mechanical properties of a joint but also in process properties and production cost are considered as objectives in the optimal design.

Prediction and optimisation of fuel consumption for inland ships considering real-time status and environmental factors

“…RSSA has been verified to outperform some salient heuristic optimisation algorithms, such as Covariance Matrix Adaptation Evolution Strategy, Differential Evolution and Generalised Generation Gap model (Zhang and Mahfouf, 2010). It has also been successfully applied to some engineering problems (Zhang et al, 2015;Datta et al, 2016). The Pseudo code of the optimisation algorithm based on RSSA is shown in Method 3.…”

Asymmetric microstructure and fracture behaviour of friction stir welded joints of 2024 aluminium alloy under cyclical load

“…Thus, the weld can be divided into three zones containing heat affected zone (HAZ), thermo-mechanically affected zone (TMAZ) and nugget zone (NZ). The combined effect of rotation and transverse motion creates the asymmetry in 1 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, PR China 2 Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi'an 710072, PR China TMAZ caused by the difference in temperature distribution 4,5 and plastic strain. 6 The pin rotation and welding direction are the same at advancing side (AS), while the other way around at retreating side (RS).…”

“…1,2 The materials forming the joints undergoes severe plastic deformation and frictional heat via the stir of pin, 3 which results in microstructure transformation and the production of texture. Thus, the weld can be divided into three zones containing heat affected zone (HAZ), thermo-mechanically affected zone (TMAZ) and nugget zone (NZ).…”

“…Friction stir welding (FSW) is a promising solid-state welding technique for the joining of alloys especially for non-ferrous metals, such as copper alloys, magnesium alloys and aluminium alloys, which have many potential applications in domains including aerospace, shipbuilding and automobile. 1, 2 The materials forming the joints undergoes severe plastic deformation and frictional heat via the stir of pin, 3 which results in microstructure transformation and the production of texture. Thus, the weld can be divided into three zones containing heat affected zone (HAZ), thermo-mechanically affected zone (TMAZ) and nugget zone (NZ).…”

Portable System for the Measure of Efficiency in Arc Welding Processes

“…Among the others, the arc welding process, by exploiting an electric arc attaining the melting by Joule effect with spherical energy distribution, shows considerable losses of heat by conduction and represents one of the most energy consuming process [3][4][5][6]. For this reason, this study has been focused on the measure of the electrical efficiency on arc welding processes.…”