Meanwhile it is testified that cathode emissive area and grid bias are the most direct effective factors. The experimental results lay a foundation for accommodation of welding every specification material at single emissive area in using EBW welder.

• 同时验证了阴极发射面积和栅偏压是电子束束斑直径大小最直接的影响因素，该结果为适应电子束焊机在单一发射面积条件下适应各种规格材料的焊接奠定了基础。