利用激光焊工艺焊接了IC10单晶高温合金，分析了焊接速度对接头焊缝成形、横截面形貌以及显微组织的影响。结果表明，随着焊接速度的减小，焊缝的表面和背面宽度增大。不同焊接速度下焊缝的横截面均呈典型的“酒杯”状。焊缝主要由细晶区和胞状晶以及柱状晶组成。不同焊接速度下的焊缝中均存在沿晶界扩展的焊接裂纹。接头中晶粒的生长方向趋于一致，从而增大了接头裂纹的敏感性。

The IC10 single crystal superalloys are welded by the laser welding process, and the effects of welding speed on joint weld forming, cross-section morphology and microstructure are analyzed. The results show that the surface and back widths of welds increase with the decrease of welding speed. The cross-sections of welds under different welding speeds all show a typical goblet shape. The welds mainly consist of fine grains, cellular crystals and columnar crystals. The welding cracks extending along the grain boundaries always occur in welds under different welding speeds. The growing direction of the grains in joints tends to be the same, which increases the cracking susceptibility of joints.