【摘要】 研究了堆焊材料组成和堆焊工艺参数对光束粉末堆焊质量的影响规律。单道单层堆焊时，预涂粉末厚度过大将导致堆焊层与母材结合不良，反之，因过高的稀释率堆焊层宏观硬度则显著下降。多层堆焊时，易产生堆焊层横向裂纹、焊道边缘气孔及层间结合不良等堆焊缺陷。多道搭接堆焊时，易产生相邻焊道搭接部位的未熔合。在镍基合金中加入与其相互润湿的金属陶瓷相（镍包WC），并控制其加入量是获得优质复合堆焊层的关键。合理控制堆焊热输入、对焊道焊趾部位的清理，以及堆焊过程中对熔池采取合理的保护，可获得无缺陷的大厚度、大面积堆焊层。更多还原

【Abstract】 The influence of surfacing material and processing parameters on the quality of light beam powder surfacing layer is investigated.When single-pass and single-layer surfacing is used,too big thickness of pre-coating can result in a poor bond between surfacing layer and base metal. On the contrary,the macrohardness of surfacing layer decreases obviously owing to high dilution when the pre-coating is too thin.The transverse crack in surfacing layer, porosity in bead edge and non-fusion between layers are the defects that are liable to produce when multi-layer surfacing is used.When multi-pass lap surfacing is used,non-fusion can easily arise between neighboring beads.Adding wettable metal ceramics(WC with Ni coating)to Ni-based alloy and controlling the content of ceramics are the key factors to acquire the high quality composite surfacing layer.When heat input is controlled reasonably,toe of weld is cleaned thoroughly and molten pool is protected rationally,the non-defect surfacing layer with big thickness and area can be acquired.更多还原