A sound Ti/Al butt joint was successfully obtained by dual-spot laser welding–brazing with a Al-12Si wire as the filler. The influence of laser power on the weld appearance, microstructure of the interfacial intermetallic compounds (IMC), and tensile strength of joints was investigated. With an increase in laser power, the thickness of IMC layer also increased and the morphology of IMC layer changed from a cellular-shape to a serrated-shape, and finally to a club-shape. The microstructure of the interface IMC comprised a brazed zone in which Ti(Al, Si)₃ was dominant and the microstructure at the Ti/Ti(Al, Si)₃ interface was composed of nano-sized granular Ti₅Si₃, and Ti₇Al₅Si₁₂. The highest tensile strength of the joints could reach up 75% of that of the Al base metal. The inhomogeneous IMC layer at the brazing interface caused a decrease in the tensile strength of joints and induced a deflection of fracture path during the tensile process.

通过使用Al-12Si焊丝作为填充剂的双点激光焊接-钎焊成功地获得了良好的Ti / Al对接接头。研究了激光功率对焊缝外观，界面金属间化合物（IMC）的微观结构和接头抗拉强度的影响。随着激光功率的增加，IMC层的厚度也增加，IMC层的形态从蜂窝状变为锯齿状，最后变为棒状。界面IMC的微观结构包括一个以Ti（Al，Si）₃为主的钎焊区，而Ti / Ti（Al，Si）₃界面的微观结构由纳米尺寸的Ti ₅ Si ₃和Ti组成。₇铝₅硅₁₂。接头的最高抗拉强度可达铝基金属的75％。钎焊界面处不均匀的IMC层导致接头的抗拉强度降低，并在拉伸过程中引起断裂路径的偏转。