采用电子束焊接的方法对10 mm厚的喷射成形Al-Zn-Mg-Cu合金板进行了拼焊实验。采用金相显微镜、扫描电镜、室温拉伸实验、显微硬度等方法分析了焊接接头的微观组织,测试了焊接接头的力学性能及显微硬度。结果表明,喷射成形Al-Zn-Mg-Cu合金焊接接头由三个区域(近缝区母材,焊核区,热影响区)组成。焊缝宽为0.3～1.0 mm,焊核区由尺寸约3～8μm的等轴细晶组成,析出相沿晶界分布,晶内析出相较少;热影响区大部分保留了母材的原始组织特征,小部分区域发生了重熔。从焊缝区到母材,显微硬度值逐渐下降,焊缝区硬度值高出母材约35。经T6处理后,焊接接头强度约为母材的82%。 Electron beam welding method was used to weld the 10 mm-thick spray-formed Al-Zn-Mg-Cu alloy plate. The microstructure of welded joint was analyzed by optical microscope, scanning electron microscope, tensile test at room temperature and microhardness. The mechanical properties and microhardness of welded joint were tested. The results show that the welded joint of spray-formed Al-Zn-Mg-Cu alloy consists of three regions (base material near weld zone, weld zone and heat affected zone). The weld width is 0.3-1.0 mm, and the weld nugget zone is composed of fine equiaxed grains with a size of about 3-8 μm. The precipitates are distributed along the grain boundaries with less precipitation in the grains. Most of the HAZ retained the original structure of the parent material Features, a small part of the region has remelted. From the weld zone to the base metal, the microhardness gradually decreases and the hardness of the weld zone is about 35% higher than the base metal. After T6 treatment, the strength of welded joints is about 82% of the base metal.