On CO2 Laser welding of Al 2024-T3 and Al 8090-T3 Aluminium Alloys Butt Joints

In this paper a set of technological parameters have been studied in order to define a possible laser welding process optimization and relative mechanical properties for Al 2024-T3 and Al 8090-T3 aluminum alloys. Bead-on-plate and butt joint of different thickness were obtained. About these materials there is an increasing interest that is due to their potential industrial applications, their enhanced mechanical properties jointed to the recognized lightness of the aluminum alloys permits to use them in particular in the aeronautical field. About these materials there is an increasing interest that is due to their potential industrial applications, their enhanced mechanical properties jointed to the recognized lightness of the aluminum alloys permits to use them in particular in the aeronautical field. For this experimental work, a CO2 laser equipment has been employed using different working parameters and set-up configurations. On the basis of the evaluation of the bead-on-plate test the optimal process conditions were selected and a number of butt joints were made in order to valuate the mechanical properties of these welds. In fact each weld was characterized by metallographic tests as well as hardness and fatigue strength measurements. Finally, on the basis of the obtained results, some final operating technological evaluations and suggestions have been underlined.