在不同焊接速度（1.0，1.2，1.6 m·min^-1）下对TA2工业纯钛进行激光焊接，研究了焊接速度对接头显微组织、扩孔性能、冲压性能和拉伸性能的影响。结果表明：当焊接速度为1.0，1.2 m·min^-1时，接头焊缝中心的显微组织为粗大α晶粒和少量针状α晶粒，当焊接速度为1.6 m·min^-1时，焊缝中心的显微组织为针状α晶粒；接头热影响区的显微组织均为粗大α晶粒和不规则锯齿状α晶粒；随焊接速度的增大，接头的晶粒尺寸减小；随着焊接速度的增大，接头的扩孔率及杯突值增加，当焊接速度为1.6 m·min^-1时，接头具有最优的扩孔性能、冲压性能和成形性能；接头的屈服强度、抗拉强度和断后伸长率随焊接速度的增大均呈先增后降的趋势，当焊接速度为1.2 m·min^-1时，接头的拉伸性能最佳，断裂形式均为韧性断裂。

Commercially pure titanium TA2 was laser welded at different welding speeds (1.0,1.2,1.6 m·min^-1). The effect of welding speed on microstructure, hole expanding property, stamping performance and tensile properties of joints was studied. The results show that the microstructure of weld center in the joint consisted of coarse α grains and a small amount of acicular α grains when the welding speed was 1.0 m·min^-1 or 1.2 m·min^-1, and consisted of acicular α grains when the welding speed was 1.6 m·min^-1. The microstructure of heat affected zone in the joint was composed of coarse α grains and irregular serrated α grains. The grain size of the joint decreased with the increase of welding speed. The hole expanding rate and cupping value of joints increased with the increase of welding speed. When the welding speed was 1.6 m·min^-1, the joint showed the best hole expanding property, stamping performance and forming performance. The yield strength, tensile strength and elongation of the joint increased first and then decreased with the increase of welding speed. When the welding speed was 1.2 m·min^-1, the joint had the best tensile properties. The fracture modes were all ductile fracture.