摘要
为了实现铜板和铝板的大面积搭接，利用自行改制的数控交流电阻焊机，采用AIZn薄带钎料，对铝合金和紫铜进行电阻钎焊工艺试验。试验过程中测量和绘制钎料温度变化曲线；分析不同焊接工艺参数（焊接电流、时间、压力）对接头性能的影响。试验结果显示，在最佳工艺参数下，熔融钎料温度维持在450-520℃，接头抗剪切强度达到63MPa以上。对接头截面硬度测试发现，靠近铜侧钎缝处易形成聚集的硬脆相，此区域显微硬度高达300HV0．1。对拉伸断口分析发现，这种硬脆相造成的解理断裂和韧窝引起的韧性断裂共同作用导致接头断裂。
In order to achieve large area overlap of copper plate and aluminum plate, using self restructuring numerical control AC resistance welding machine, the resistance brazing technology experiment for red copper and aluminum was carried out with thin ship filler metal of A1Zn. In the process of experiment, the changing temperature curve for solder was measured and mapped, and the influence of different welding parameters （welding current, time, pressure） on the performance of joint was analyzed. The test results show that the molten solder temperature is maintained at 450 ~C- 520~C, and joint shear strength reaches over 63 MPa. In addition, through the hardness test of joint in cross section, it is found that solder joint near the copper-side is easy to form a collected hard and brittle phase, where the hardness is up 300 HV0.1. Through subsequently scanning tensile fracture analysis, it is found that the cleavage fracture caused by this hard and brittle phase and ductile fracture resulting from dimple leads to joint fracture.
出处
《热加工工艺》
CSCD
北大核心
2016年第17期74-77,共4页
Hot Working Technology
关键词
电阻钎焊
焊接参数
抗剪强度
硬脆相
resistance brazing
welding parameters
shear strength
hard and brittle phase
