Controlling the Electron Beam Focus Regime and Monitoring the Keyhole in Electron Beam Welding

Abstract

Control of beam focus position is important in the regime choice of electron beam welding (EBW). It is known that the methods of electron beam focus control in electron beam welding are done according to the parameters of secondary current signal collected in plasma. The purpose of the study is to develop a method for operational control of the electron beam focusing during welding in the deep penetration mode. The method uses an additional informational parameter of collected current signal in beam/work-piece plasma. This parameter can be used for creating the operational control methods for exact electron beam focusing during the process of welding. In addition, uses of this parameter allow a better study of the keyhole processes.

Benefits And Prospects Of Laser Welding Application In Vacuum

“…In order to overcome the obstacle, we can apply the methods widely used in technologies of electron beam welding eliminating root defects. These methods are: periodic impacts on a beam [6][7], the choice of optimum focusing [8][9][10], etc.…”

Controlling root penetration in electron beam welding by a through-current feedback

“…The augmentation of controlling operations is related, for example, to the strict alignment and positioning requirement of the electron beam in relation to the location of the joint/groove to be welded. In references [25][26][27][28][29][30][31][32], it can be found various alternatives introduced in detail for systems where the focal position of the electron beam in relation to the workpiece and the joint to be welded can be controlled in real time. The information for the control system needed for control and adjustment during the welding process is obtained by using suitable sensors that are able to collect, for example, the secondary current in plasma from the weld plume, the intensity of backscattered electrons/X-rays from the welding direction.…”