Perm National Research Polytechnic University, 29 Komsomolsky Av., Perm 614990, Russia.
Sensors (Basel). 2012 Dec 14;12(12):17433-45. doi: 10.3390/s121217433.
Electron beam welding (EBW) shows certain problems with the control of focus regime. The electron beam focus can be controlled in electron-beam welding based on the parameters of a secondary signal. In this case, the parameters like secondary emissions and focus coil current have extreme relationships. There are two values of focus coil current which provide equal value signal parameters. Therefore, adaptive systems of electron beam focus control use low-frequency scanning of focus, which substantially limits the operation speed of these systems and has a negative effect on weld joint quality. The purpose of this study is to develop a method for operational control of the electron beam focus during welding in the deep penetration mode. The method uses the plasma charge current signal as an additional informational parameter. This parameter allows identification of the electron beam focus regime in electron-beam welding without application of additional low-frequency scanning of focus. It can be used for working out operational electron beam control methods focusing exactly on the welding. In addition, use of this parameter allows one to observe the shape of the keyhole during the welding process.
电子束焊接（EBW）在焦点控制方面存在一定问题。在电子束焊接中，可以根据二次信号的参数来控制电子束焦点。在这种情况下，二次发射和聚焦线圈电流等参数具有极值关系。有两个聚焦线圈电流值可以提供相等的信号参数值。因此，电子束焦点控制的自适应系统采用低频聚焦扫描，这极大地限制了这些系统的运行速度，并对焊缝质量产生负面影响。本研究的目的是开发一种在深熔焊接模式下进行电子束焦点操作控制的方法。该方法使用等离子体电荷电流信号作为附加信息参数。该参数允许在不应用额外的低频聚焦扫描的情况下识别电子束焊接中的电子束焦点模式。它可以用于制定精确针对焊接的电子束操作控制方法。此外，使用该参数还可以观察焊接过程中孔的形状。
