将不同含量和粒径的球形铸造碳化钨颗粒添加到雾化铁粉中制备堆焊焊条，然后在Q235钢表面进行氧-乙炔火焰堆焊来获得堆焊层，研究了球形铸造碳化钨颗粒的含量和粒径对堆焊层显微组织、硬度及耐磨性能的影响。结果表明：堆焊层中球形铸造碳化钨颗粒边缘有明显的溶解现象，粒径越小，溶解现象越明显；随球形铸造碳化钨颗粒含量的减少，堆焊层中的鱼骨状莱氏体组织减少，随球形铸造碳化钨粒径的减小，莱氏体组织逐渐粗化；球形铸造碳化钨颗粒的含量越高，粒径越小，堆焊层的硬度越高，耐磨性越好。

The spherical cast tungsten carbide particles with different contents and particle sizes was mixed with atomized Fe powder to prepare surfacing electrodes. The surfacing layer on Q235 steel substrate was obtained using oxygen-acetylene flame surfacing. The effect of content and particle size of spherical cast tungsten carbide on the microstructure, hardness and wear resistance of surfacing layer was investigated. The results show that there was an obvious melting phenomenon at the edges of spherical cast tungsten carbide in surfacing layer. The smaller the particle size of spherical cast tungsten carbide was, the more obvious the melting phenomenon was. The fish-bone ledeburite decreased with decrease of spherical cast tungsten carbide particles content, and the ledeburite became coarser with reduction of particle size of spherical cast tungsten carbide. The more spherical cast tungsten carbide particles content was, and the smaller particle size was, the higher the hardness was and the better the wear resistance of surfacing layer was.