2219铝合金搅拌摩擦焊板硬化方程的建立与液压成形过程分析

Considering the difficulties in localized mechanical properties characterization of welding of friction stir welded blank, hardening equations establishment and integrated hydroforming process simulations, the stress-strain curves of different micro-zones of welding line of AA2219 aluminum alloy friction stir welding (FSW) were obtained based on digital image correlation (DIC) technology, and the hardening equations of the weld zone (WZ) and base material (BM) of friction stir welded blank were established. The accuracy of equations was verified by comparing the hydraulic bulging simulation with the process experiments. On this basis, the hydroforming process and welding line deformation behavior of the AA2219 aluminum alloy FSW curved surface blanks were investigated. The result shows that the FSW welding line deformation after solution treatment is mainly located in the weld nugget zone (WNZ) and thermo-mechanical affected zone (TMAZ). Compared with BM, the maximum deformation amount is increased by 42.0% and 19.0%, respectively. The area of thickness thinning zone of semi-ellipsoidal welded component is related to the location of welding line. The welded component with the offsetting welding line is prone to fracture due to large tensile stress, and the stress state of the central welding line is more conductive to forming.