采用普通退火和去应力退火两种退火工艺对TC18钛合金电子束焊接接头进行焊后热处理，研究了退火处理对焊接接头显微组织、拉伸性能和冲击性能的影响，并将接头的性能与母材的进行了对比。结果表明：与去应力退火相比，普通退火后，显微组织中的α相含量减少，β相含量增多，接头的强度降低，塑性更高；两种方式退火后，母材和焊接接头的拉伸性能相差不大，但母材的冲击性能优于焊接接头的。

Firstly, normal annealing and stress relief annealing were carried out on electron beam welded joint of TC18 titanium alloys, and then the effects of annealing treatments on microstructure, tensile and impact properties of the welded joint were studied; the properties of the welded joint were compared with that of the base metal. It is shown that, compared with the stress relief annealing, the content of α phase in the normal annealed joint decreased significantly while the content of β phase increased dramatically. Compared with the stress relief annealing, the strength of the joint adopting normal annealing was lower, while its plasticity was higher. After normal and stress relief annealing treatments, the tensile properties of base metal and welded joint were similar, but the impact property of base metal was better than that of the welded joint.