为了探索在非水平基面上激光增材制造薄壁件的成形规律，拓展激光增材修复技术的广泛应用。基于激光内送粉技术，分别在0°~150°的倾斜基板上进行薄壁件的成形试验，研究了不同倾斜角度下薄壁墙的成形规律，并分析了非水平基面下熔池的受力规律。试验结果表明：随基板倾斜角度的增大，薄壁墙的总体宽度及高度增大，熔池长度变短；随着基板倾斜角度的增大，成形件尾部塌陷越来越严重，在基板角度150°时，产生最大角度为21°的斜坡。该研究结果可以为非水平基面上激光增材制造及修复提供参考价值。

To investigate the forming rules of laser additive manufacturing thin-walled parts on a nonhorizontal substrate and expand the extensive use of laser additive repair technology, the forming experiments of thin-walled parts were conducted on an inclined substrate from 0° to 150°, based on the inside-beam powder feeding technology. The forming rules of thin walls under different inclination angles were examined, and the forces of a molten pool under the nonhorizontal substrate were investigated. The experimental findings demonstrate that the total width and height of thin walls increase, and the length of the molten pool decreases with the increase of substrate inclination angle. The forming part’s tail collapse becomes severe with the increasing substrate inclination angle. A slope with a 21° maximum angle is obtained when the substrate angle is 150°. The study findings offer reference value for laser additive manufacturing and repair on the nonhorizontal substrate.