应用 3kW连续CO2 激光器对轧辊钢进行激光熔凝搭接处理 ,分析了搭接区的显微组织和硬度。结果表明 ,搭接区的组织分布特征和光斑中心基本一样 ,包括搭接熔凝区、搭接相变区和搭接热影响区 ,搭接区的显微硬度分布和光斑中心也相同 ,且当搭接参数合适时 ,可得到较均匀的表面硬化层。 The 3kW continuous CO2 laser was used to laser roll-join the roll steel and the microstructure and hardness of the overlapped zone were analyzed. The results show that the distribution characteristics of lap joints are basically the same as those of spot centers, including the lapped fusion zone, lap phase transition zone and lap heat affected zone. The lapped zone has the same microhardness distribution and spot center When the lap parameters are suitable, a more uniform surface hardened layer can be obtained.