Aiming at the unmelted powders splash from collision between electron and powders, optimized process parameters is selected to pre-heat the powders to obviously reduce the splash.

• 针对实验中出现的电子与粉末碰撞造成的未熔粉末的飞溅，采用优化的工艺参数对粉层进行预热，从而大大减少了未熔粉末的飞溅。