*1.5. Aim of Work*

The aim of the present study was to extend this last study and to investigate the feasibility, microstructural, and mechanical properties of EN AW-6181 or 6082-T6/EN and AC 42100-T6 aluminum alloy joints by considering other welding techniques. In particular, the present article analyzes and compares the metal inert gas technique (MIG), with cold metal transfer (CMT) and fiber laser-MIG hybrid welding through the evaluation of the final microstructure, the analyses of grain size, second-phase fraction, and dissolution of the precipitate in HAZ and FZ. Optical microscopy (OM) as well as the mechanical properties of welds (micro and macro hardness) were used. Junctions of both samples and a prototype frame of a sports car were examined and compared.
