(1. 南昌航空大學 航空制造工程學院，南昌 330063；
2. 上海航天設備制造總廠，上海 200245；
3. 哈爾濱工業(yè)大學 先進焊接與連接國家重點實驗室，哈爾濱 150001)
摘 要: 采用微電阻點焊方法成功實現(xiàn)0.1 mm厚鈹青銅薄片的連接，研究鈹青銅焊前固溶處理(固溶態(tài))和固溶再時效處理(時效態(tài))對搭接接頭力學性能和顯微組織的影響。結果表明：鈹青銅經不同熱處理后，時效態(tài)接頭的抗拉剪力明顯高于固溶態(tài)的。固溶態(tài)鈹青銅接頭的最大平均抗拉剪力為60.54 N時，熔核由較小的胞狀晶、較大的等軸枝晶和柱狀枝晶組成；時效態(tài)接頭最大平均抗拉剪力為137.28 N時，熔核由較大的胞狀晶和均勻細小的等軸晶組成。在相同工藝參數(shù)下，時效態(tài)接頭獲得的熱輸入量約為固溶態(tài)接頭的1.73倍。
關鍵字: 鈹青銅；焊前熱處理；微電阻點焊；力學性能；顯微組織
（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
