本发明公开了一种提高可热处理强化铝合金搅拌摩擦焊接接头性能的方法。重点包括以下工艺步骤：首先将需焊接的铝合金材料进行固溶热处理，固溶温度（465~545）±5℃，保温时间（4~8）h，水淬后，放入低温环境中保存；采用搅拌摩擦焊接设备焊接铝合金，并在焊缝位置采用快速冷却处理，在抑制再结晶晶粒长大的同时，保证合金元素尽可能多地固溶在铝基体中，获得过饱和固溶体；搅拌摩擦焊接完成后，对整个焊接件进行峰值时效热处理，其中时效处理温度为（150~190）±5℃，保温时间（7~20）h。本发明可以避免焊接接头部位时效析出相的溶解和长大，抑制焊接接头的软化，提高焊接接头的强度和塑性，最终获得组织致密、强度达到母材强度85%以上、综合性能好的搅拌摩擦焊焊接接头。

The invention discloses a method for improving the performance of heat-treatable reinforced friction stir welding joint of aluminum alloy. Firstly, the aluminum alloy to be welded is subjected to solution heat treatment at solution temperature (465~545) ±5℃ and holding time (4~8) h. After water quenching, it is stored in a low temperature environment. The aluminum alloy was welded by friction stir welding equipment, and the fast cooling treatment was adopted at the weld position, which ensured that the alloy elements were solidly dissolved in the aluminum matrix as much as possible while inhibiting the growth of recrystallization grains, and supersaturated solid solution was obtained. After the completion of friction stir welding, the whole welding part was subjected to peak aging heat treatment, in which the aging treatment temperature was (150~190) ±5℃, and the holding time was (7~20) h. The invention can avoid the dissolution and growth of aging precipitated phase at the welding joint, suppress the softening of the welding joint, improve the strength and plasticity of the welding joint, and finally obtain the friction stir welding joint with dense structure, strength reaching more than 85% of the strength of the base material and good comprehensive performance.