针对Ti₂AlNb/TC4 异种钛合金利用激光焊接焊缝容易产生气孔的问题，提出了采用激光光束偏移来焊接Ti-22Al-27Nb 与Ti-6Al-4V 异种材料的方法。试验结果表明，光束偏向Ti-22Al-27Nb 侧时能够有效抑制焊缝中气孔缺陷产生；光束居中及偏向Ti-22Al-27Nb 一侧焊接时，焊缝相组成为B2相，光束偏向Ti-6Al-4V 一侧进行焊接时，焊缝相组成为B2+α′相；Ti-22Al-27Nb 侧热影响区为单一的B2 相，Ti-6Al-4V 侧热影响区为针状α′相和原始α相。由于激光光束偏向Ti-6Al-4V 一侧时焊缝中针状α′相的第二相强化作用，使其抗拉强度及塑性高于光束居中和偏向Ti-22Al-27Nb一侧时的性能。

In view of the high porosity susceptibility in laser welded Ti₂AlNb/TC4 dissimilar alloy, different beam displacements are applied in laser welding of Ti-22Al-27Nb and Ti-6Al-4V alloy. The results show that porosity can be successfully suppressed when laser beam acts on Ti-22Al-27Nb alloy. The fusion zones consist of B2 and B2+ α′ when the beam acts on Ti-22Al-27N band Ti-6Al-4V alloy, respectively. The heat affected zone (HAZ) of Ti-22Al-27Nb is entirely composed of B2. A mixture of acicular α′ and primary α are formed in the HAZ of Ti- 6Al-4V alloy. Due to the second phase strengthening of acicular α′ in the fusion zone when laser acts on Ti-6Al- 4V alloy, the welded joint exhibits higher tensile strength and ductility compared with those produced when the beam acts on Ti-22Al-27Nb alloy or at the middle of two base metals.