【摘要】 【目的】旨在探究胶层添加对搅拌摩擦搭接焊工艺焊接温度与接头内部成形的影响。【方法】以3 mm厚2024-T4铝合金为对象，通过MSC.Marc软件对温度场进行有限元模拟，并通过K型热电偶的测温试验进行验证，对比分析搅拌摩擦搭接焊与搅拌摩擦搭接胶焊工艺的焊接温度分布及其影响下的接头内部成形特征。【结果】在搭接界面添加的胶层因具有比铝合金更小的热导率，使上板的峰值温度更高且高温区更大，造成上板的焊核区更宽，且延伸入焊核的冷搭接的长度与高度增大。【结论】与搅拌摩擦搭接焊相比，搅拌摩擦搭接胶焊工艺下板的高温区较小，使钩状结构向下弯曲且在下板内具有更大的弯曲角，接头平均拉伸剪切性能由12.14 kN提升至14.34 kN。更多还原

【Abstract】 [Objective] The aim is to investigate the influence of adhesive layer addition on welding temperature and joint internal forming of friction stir lap welding process. [Methods] Taking 3 mm-thick 2024-T4 aluminum alloy as the object, temperature field was subjected to finite element simulation through MSC.Marc software and verified through the temperature measurement test of K-type thermocouple. Welding temperature distribution of friction stir lap welding and friction stir lap welding bonding process and the internal forming characteristics of the joints under the influence were compared and analyzed. [Results] The adhesive layer added at the lap interface has a smaller thermal conductivity than that of aluminum alloy, which makes peak temperature of the upper plate higher and high-temperature zone larger, resulting in a wider stir zone of the upper plate, and an increase in the length and height of the cold lap extending into the stir zone. [Conclusion]Compared with friction stir lap welding, high-temperature zone of the lower plate of friction stir lap welding bonding process is smaller, which makes the hook bend downward and has a larger bending angle in the lower plate. The average tensile shear property of the joints is increased from 12.14 kN to 14.34 kN.更多还原