【摘要】 采用AA2195铝锂合金与钛合金进行搅拌摩擦搭接工艺试验，研究了焊缝成形、接头组织和力学性能。结果表明：在不同焊接参数条件下，随着焊接热输入的减小，焊缝表面更加光滑；Ti/Al接头界面平整，没有明显的Ti、Al混合，在最优参数下没有形成钩状结构。由于搅拌头的搅拌作用增强，在1000 r/min的高转速下，在Ti/Al界面处更容易形成钩状缺陷和金属间化合物，从而使接头的力学性能恶化。降低热输入有利于提高焊核区铝合金的硬度。在转速为800 r/min、焊接速度为120 mm/min的最优参数下，接头的最大抗剪强度为289 N/mm。更多还原

【Abstract】 Friction stir lap welding of AA2195 Al-Li alloy and Ti alloy was conducted to investigate the formation,microstructure,and mechanical properties of the joints.Results show that under different welding parameters,with the decrease in welding heat input,the weld surface is smoother.The Ti/Al joint interface is flat without obvious Ti and Al mixed structure,and the hook structure is not formed under optimal parameters.Due to the enhanced breaking effect of the stirring head,the hook structural defects and intermetallic compounds are more likely to form at the Ti/Al interface at high rotational speed of 1000 r/min,thereby deteriorating the mechanical properties of joints.Decreasing the heat input is beneficial to hardness enhancement of the aluminum alloy in the weld nugget zone.Under the optimal parameters of rotation speed of 800 r/min and welding speed of 120 mm/min,the maximum tensile shear strength of joint is 289 N/mm.更多还原