Numerical study of TTP curves upon welding of 6063-T5 aluminium alloy and optimization of welding process parameters by Taguchi′s method

摘要

This paper presents a numerical study to determine the cooling curves of 6063-T5 aluminium alloy plane plates using the MIG welding technique. The aluminium alloys show characteristic curves, known as time-temperature-property (TTP) curves, representing time-temperature-properties that indicate the mechanical properties obtained by the cooling process, and therefore the area of intersection between the cooling curve and the TTP curve quantitatively approximates the mechanical properties obtained in the welding joint. In addition, the mechanical properties in a welded aluminium alloy also depend on the time taken to cool the welding joint from 410°C to 300°C. The electrical parameters are the source power and welding speed, which are selected from the European welding standard to ensure adequate reproduction of results. In this work, the area of intersection between the cooling curve and t_4/3 is optimized by Taguchi's method, where the signal-to-noise ratio and analysis of variance are utilized to obtain the influence of the parameters on the area of intersection and t_4/3. This numerical study can also be applied to the GTAW welding technique.