电子束焊接工件的传导电流特性

Study of the BCTW' s phenomenon and characteristics in EBW

讨论了电子束焊接过程中电子失去动能的能量转换和电子定向流动的电流传导这两种物理过程,提出并定义了工件传导电流概念,设计了专用的多通道电流信号采集系统,从复杂的电子束焊接动态过程中剥离并定量检测出包涵焊接信息的工件传导电流的动态行为。全面系统地研究了工件传导电流的时域、频域、排序特性、传导比等特性;发现并证明了传导比可定量地描述焊接动态过程的临界穿透状态;利用研究获得的传导比均值与输入束流的函数关系建立了可描述电子束焊接过程的动态特性判据。

Two physical processes of the energy conversion and the current conduction were analyzed in the dynamic process of EBW. According to the characteristics of EBW process, the beam current through workpiece during EBW process was studied using the special multichannel device to collect current signal. The characteristics of the time domain, frequency domain, sequencing, conducting ratio of BCTW were investigated by experiment. The function between average ratio of BCTW and input electron beam was recognized and peak value of the function was the turning point of the critical penetration state in the dynamic process of EBW.