报道了Nd:YAG全固态激光器同轴送粉激光熔覆快速制造金属零件的工艺与机制。主要研究了不同工艺条件下，激光熔覆工艺参数(激光功率、扫描速度、送粉量大小)对激光熔覆层宽度、高度、表面平整度和成型质量的影响规律。在此基础上，对成型薄壁墙的水平方向倾斜角度在不同功率下做了极限实验并分析了其中原因，找出了最佳的成型参数。最后，将Nd:YAG激光熔覆快速制造所制备零件的质量与CO2激光熔覆所制备的进行了对比，结果表明，采用Nd:YAG激光器制备的金属试样结合强度更高，同时，两者都高于相近成分下常规加工方式所加工试样的相应值，且均表现为韧性断裂。

Direct laser fabrication (DLF) of metallic materials has been carried out by Nd:YAG all-solid-state laser. The effect of the processing parameters, such as laser power, scanning velocity, and power feeding rate on the final deposition result was investigated. The utmost offset of deposited wall in horizontal orientation was also studied. A mechanical performance comparison of samples made by Nd:YAG laser and CO2 laser was also presented. It was found that the metallic parts made by Nd:YAG laser got well strength than CO2,but both fracture strength are higher than the corresponding values got by the conventional processing methods, as well as they all exhibits as toughness fracture.