Thin-walled tubular components of aluminum alloys, fabricated by friction stir welding (FSW) can be utilized in automobiles as energy absorbers due to its cost-effectiveness and no dimensional restrictions. However, FSW of tubes is challenging due to the presence of curvature in the tubes. Thus, an attempt was made to fabricate tubes of AA 5083-O through longitudinal friction stir welding process. Critical process parameters for welding the tube were optimized for longitudinal direction using response surface methodology in an attempt to obtain a good quality welded joint. Furthermore, post welding properties of the tube such as roughness value of the weld zone and tensile properties were evaluated. It was found that with optimized parameters the weld region had low surface roughness and excellent tensile strength which was due to proper heat generation during welding. Moreover, crushing performance of the welded tube was also performed and the weld zone showed no failure during crushing along with good energy absorption.