摘要
采用搅拌摩擦焊双面焊接工艺焊接42 mm厚7B05-T5铝合金型材,利用金相组织观察、显微硬度测定、拉伸能测试等方法研究了搅拌摩擦焊接头的微观组织特征和力学性能。结果表明,焊核区由于发生了动态再结晶,其组织为细小的等轴再结晶组织;焊缝两侧的热机影响区受力和热的双重作用,组织发生一定程度的变形和回复;热影响区组织和母材相似,受热循环作用发生了粗化。力学实验表明,接头的抗拉强度达303 MPa,为母材的90%,拉伸试样均断裂于近缝区热影响区,这与显微硬度分布测定的热影响区软化区位置一致。
In this paper,42 mm thick 7N01-T5 aluminum alloy plate was welded by FSW.The microstructure and mechanical properties of the FSW joint were studied by microstructure observation, microhardness measurements and tensile tests.The results showed that the nugget zone has fine equiaxed grains due to the dynamic recrystallization.The thermo-mechanically affected zone was characterized by plastic deformed and recovered structure because of the stains and thermal cycle subjected during the FSW process.The heat affected zone retained the same grain structure as the parent material,but grain coarsening occurred,which is also attributed to the thermal cycle during welding.The tensile strength of the joint was 303 MPa that reached about 90% of the base material,and all the tensile specimens were fractured in the heat affected zone,which was confirmed as softening region by microhardness measurement.
出处
《电焊机》
2016年第3期105-108,共4页
Electric Welding Machine
