Development of micro-arc welding process

实验研究了在扫描电子显微镜、真空和大气两种环境下导线与平面之间微米间隙放电的特征。搭建了由细钨电极、压电三脚架和尺蠖等纳米控制作动器以及电流和电压监测装置组成的实验装置。通过在间隙上施加几百个电压，电击穿并同时发生极少量的阳极熔化。平面试样上熔点的直径取决于放电能量的大小。通过沿表面移动电极并施加重复脉冲电压进行放电，可以形成类似焊珠的熔化区。

Features of micrometer gap discharge between a wire and a plane has been experimentally investigated in both environments of Scanning Electron Microscope vacuum and the atmosphere. The experimental setup, which is consisted of a thin tungsten electrode, nanometer controlled actuators such as a piezoelectric tripod and an inchworm, and monitoring devices of current and voltage, was constructed. By applying several hundreds voltages to the gap, electrical breakdown and at the same time very small melting of the anode occurs. Diameters of melting spots at the plane specimen depend on the amount of discharge energy. A weld bead like melted zone can be formed by traveling electrode along the surface and applying repeated pulsed voltage for electric discharge.