The focus current is a very important parameter in the electron beam welding practice. The change of focus current determines the distance between focal point and the workpiece surface, which leads to the better weld shape. Using the hybrid integrated circuit technology, a new type of constant current source with high-precision temperature stability to accommodate high accuracy and larger current demand is studied. It is found that the EB beam spot can obtain higher quality at the different focal distance.%聚焦电流是电子束焊接过程中一个非常重要的参数,调节聚焦电流可以控制电子束焦点相对于工件的位置,从而获得较好的焊缝截面形貌.研究了一种应用混合集成电路技术实现的恒流源,以适应聚焦系统对恒流源高精度、高温度稳定性和较大电流的需求,满足焊接工件在不同的工作距离下都可获得品质较好的电子束束斑.
展开▼
