(1. 南昌航空大学 航空制造工程学院，南昌 330063；
2. 上海航天设备制造总厂，上海 200245；
3. 哈尔滨工业大学 先进焊接与连接国家重点实验室，哈尔滨 150001)
摘 要: 采用微电阻点焊方法成功实现0.1 mm厚铍青铜薄片的连接，研究铍青铜焊前固溶处理(固溶态)和固溶再时效处理(时效态)对搭接接头力学性能和显微组织的影响。结果表明：铍青铜经不同热处理后，时效态接头的抗拉剪力明显高于固溶态的。固溶态铍青铜接头的最大平均抗拉剪力为60.54 N时，熔核由较小的胞状晶、较大的等轴枝晶和柱状枝晶组成；时效态接头最大平均抗拉剪力为137.28 N时，熔核由较大的胞状晶和均匀细小的等轴晶组成。在相同工艺参数下，时效态接头获得的热输入量约为固溶态接头的1.73倍。
关键字: 铍青铜；焊前热处理；微电阻点焊；力学性能；显微组织
（1. School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2. Shanghai Spaceflight Manufacture (Group) Co., Ltd., Shanghai 200245, China;
3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China）
Abstract:The beryllium bronze sheets with thickness of 0.1 mm at solid solution state and aging state were welded successfully by the micro-resistance spot method. The effects of heat treatment before welding on the microstructure, mechanical properties of the lap joints were researched. The results show that after heat treatment, the mechanical performances of the joints produced at aging state are obviously superior to those at solid solution state. The average tensile shear force of the joints made by beryllium bronze at solid solution state is 60.54 N. And the nugget zone is characterized by fine cellular crystals, equiaxial dendrite and dendritic columnar crystals. However, the average value of the joints produced with aging state reaches to 137.28 N. The nugget consists of cellular crystal and the fine equiaxed grains. At the same process parameters, the heat input of beryllium bronze joints with aging state is about 1.73 times higher than that at solid solution state.
Key words: beryllium bronze; heat treatment before welding; micro-resistance spot welding;mechanical property; microstructure
