中文摘要：

以先进的柔性激光焊接工艺为手段，在局部保护条件下实现了铝合金薄壁结构的焊接，并针对铆接、点焊、TIG焊、激光焊（不填料）三种传统焊接方法开展工艺研究，发现2024铝合金焊接工艺过程易于形成的冶金缺陷主要有气孔和裂纹，而高能量输入的激光焊可解决裂纹这一问题；性能试验结果表明：铆接和电阻点焊拉伸性能较母材相比降低幅度大，弯曲性能损失幅度小，但疲劳性能很差；TIG焊试件的拉伸性能尚可，但塑性损失较大，并且疲劳性能较母材相比有较大幅度的降低；激光焊试件的综合力学性能有较大幅度的改善，并且疲劳性能最好，无论是在高应力水平还是低应力水平均略低于母材。

英文摘要：

With the aid of laser welding, thin-wall 2024 A-alloy structure was welded; moreover, the welding joint of different welding technology was contrast and investigated. During the welding process, the 2024 A-alloy was leaning to form the gas porosity and crack, yet after laser welding, the crack was vanished. In the mechanical properties test, the tensile properties and fatigue of riveting structure and dot welding joint was deteriorative compared with base metal while bending properties was accepted; TIG welding joint has comparable tensile strength but poor ductility and fatigue properties; laser welding joint has the best combination properties and fatigue properties, whose fatigue properties was close to that of base metal, whether at high or low stress level.