Abstract
The welding process in aluminum is a complex process that commonly presents several issues such as weld bead discontinuity, cracks, and lack of penetration. Thus, an accurate specification of the parameters in order to achieve optimal values for the investigated responses is aimed by the industry. The present paper proposes the application of a multiobjective optimization approach considering multivariate constraints based on the simultaneous confidence intervals and the elliptical region of the correlated data. Structured experiments for the welding process of aluminum alloy (AA) 6063 TA tubes used in corona rings were performed according to a face-centered composite design with 4 factors, wire feed rate (Wf), arc voltage (V), contact tip to the workpiece distance (Ct), and motor frequency (Fr), resulting in 31 experiments. Poisson regression was applied to model the values of yield (Y), dilution (D), reinforcement index (RI), and penetration index (PI), allowing to estimate the optimal individual values with regard to the multivariate constraints. Rotated factor scores were obtained in order to replace the original data, and therefore, the factor multivariate square error was used as objective functions to be minimized through normal boundary intersection method. A satisfactory weld bead with large values of PI, D, and Y and a small value of RI was reached as prespecified by the manager of the process.
Highlights
Corona rings are used to improve the performance of the insulator strings
Initially, all the data obtained through the execution of the 31 experiments are shown in Table 4, where the following abbreviations Y, D, RI, and PI stand for yield, dilution, reinforcement index, and penetration index, respectively
The present paper proposed the application of a methodology based on Poisson regression, multivariate constraints to optimize, through normal boundary intersection method, a multiobjective problem considering the welding process of aluminum alloy (AA) 6063 T4 tubes used in corona rings
Summary
Corona rings are used to improve the performance of the insulator strings. They reduce corona discharges as well as associated audible noise level, and radio and television interference levels. Corona rings do improve the voltage distribution along the insulator string by reducing the percentage of the voltage on the nearest unit to the power transmission line. They alleviate corona degradation of non-ceramic materials. They are toroidal shaped metallic rings which are fixed at the end of bushings and insulator strings. They are called as anti-corona rings, and they are used to prevent corona discharge that occurs in high-voltage power lines.
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