 The paper compares the results of electron beam welding, EBW, and friction stir welding, FSW, techniques when joining EN AW6082T6 alloy. It was found that both techniques resulted in decreased strength and elongation compared to the base material. However, EBW showed more magnesium evaporation than FSW, while FSW caused the dissolution of MG2C particles responsible for strengthening the material during heat treatment. This article was authored by Piotronoga, Tomasz Skrzekit, Maciej Wedrykowicz, and others.