<p>Nowadays, the dissimilar AA2024 and AA7075 aluminum alloys are extensively used in important manufacturing industries such as aviation and aerospace due to their lightweight structure. However, in order to weld these dissimilar aluminum alloys to each other with high quality, the most appropriate welding parameters must be determined. In this context, in this research, the dissimilar AA2024 and AA7075 aluminum alloys were welded by means of TIG (tungsten inert gas) welding technology at different welding parameters, and the effects of groove angles on the joint strengths (i.e., mechanical properties) were investigated. At the conclusion of the research, considering the UTS (ultimate tensile strength) values of the specimens joined at different groove angles through TIG welding, it was found that the highest UTS value (288&#xa0;MPa) was 85.81% higher than the lowest UTS value (155&#xa0;MPa). Furthermore, when average UTS values were compared with each other (from 45° groove angle to the 90° groove angle), it was observed that there was an increase of 15.16, 15.81 and 23.64%, respectively. Considering the YS (yield strength) values, it was found that the highest YS value (160&#xa0;MPa) was 13.47% higher than the lowest YS value (141&#xa0;MPa). Moreover, it was revealed that the highest YS value was obtained from the specimen with a 90° groove angle, while the lowest YS value was obtained from the specimen with a 45° groove angle. Considering the EB (elongation) values, it was found that the highest EB value (with 90° groove angle joint) was 60.78% higher than the lowest EB value (with 45° groove angle joint). In the ANOVA analyses, it was understood that the most effective parameter on UTS, YS and EB was groove angle with rates of 93.56% (for UTS), 56.22% (for YS) and 93.09% (for EB), respectively.</p> Graphical Abstract <p></p>