基于光内送粉技术，激光熔覆成形了变壁厚偏心圆环结构。规划了变壁厚偏心圆环的成形扫描路径，利用基于机器视觉的层高控制软件获得了每个成形段的实际高度，并与设定的期望高度进行对比，建立了基于比例积分(PI)控制器的速度校正模型。成形的偏心圆环结构的最小壁厚为2.14 mm，最大为6.38 mm。每段总堆高与期望总堆高的误差较小，整体高度相对平整，具备较高的成形精度。成形件不同壁厚处的晶粒组织均匀致密，晶粒尺寸接近。

Basded on the hollow laser beam internal powder feeding technology, the thickness-variable eccentric ring structure is fabricated by laser cladding forming. The scanning paths for forming the thickness-variable eccentric ring structures are planned. The layer-height control software based on machine vision is used to obtain the actual height for the each forming layer, which is compared with the desired height. The speed-correction model based on the proportion-integration (PI) controller is established. The forming eccentric ring structure has the minimum wall thickness of 2.14 mm and the maximum wall thickness of 6.38 mm. The error of actual total height with respect to the desired one of each segment is relatively small and the overall height is relatively flat, which shows the forming accuracy is high. At positions with different wall thicknesses of forming parts, the grain structure is uniform and grain size is comparable.