利用带有预气化脉冲的激光束，对Ti6Al4V钛合金进行激光点焊胶接复合连接实验，分析了胶层分解后产生的残余碳对激光点焊胶接复合接头内组织和性能产生的影响。研究结果表明，胶层分解后产生的残余碳会使钛合金的激光点焊胶接复合接头中出现大量的TiC，并且在焊点与胶层接触的界面处生成以TiC为主的界面反应区。对钛合金激光点焊胶接复合接头内部组织产生影响的残余碳主要是在预气化脉冲过程中分解所产生的，而形成界面反应区的残余碳则主要来源于后续的胶层回流现象。TiC的出现提高了钛金点焊胶接复合接头的显微硬度，但是不利于提高钛合金点焊焊接复合接头的承载能力。

The laser beam with pre-gasification pulse is used in titanium Ti6Al4V laser spot weld bonding test. The influence of residual carbon from adhesive pyrolysis on microstructure and properties of titanium laser spot weld-bonded joint is studied. The results show that lots of TiC appear in the titanium weld-bonded joint because of residual carbon from adhesive pyrolysis, and interface reaction zone compose mainly by TiC appear in the interface between spot-welded joint and adhesive layer. The residual carbon that affects the microstructure of titanium laser spot weld-bonded joint is mainly from the pyrolysis in the pre-gasification pulse, and the residual carbon which composes interface reaction zone is from the back flow of adhesive after the joining process. The advent of TiC increase the hardness of titanium weld-bonded joint, but also has an adverse effect on the tensile-shear load of titanium weld-bonded joint.