中文摘要：

在激光熔覆快速成型中利用中空的环形激光，实现了光内同轴送粉。分析环形激光光斑在扫描线宽方向的能量分布情况，与传统的圆形实心光斑相比，有利于能量的合理分布和提高激光热作用效应。在这种优势下，可以有效地提高金属粉末的利用率，并且可以得到高质量、较为平坦的熔覆层。

英文摘要：

The coaxial powder feeding has been accomplished by the using of hollow annular laser, in rapid prototyping by laser cladding. By analyzing the energy distribution of annulus laser facula, the annulus laser facula is much propitious to shaped than traditional circular or rectangular facula. At this advantage, we can effectively improve the utilization of metal powders , and accessible relatively fiat cladding with high-quality.