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Sensors 2012, 12(12), 17433-17445; doi:10.3390/s121217433
Article

Plasma Charge Current for Controlling and Monitoring Electron Beam Welding with Beam Oscillation

1,* , 1
, 1
, 1
, 1
 and 2
1 Perm National Research Polytechnic University, 29 Komsomolsky Av., Perm 614990, Russian Federation 2 Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee, Sofia 1784, Bulgaria
* Author to whom correspondence should be addressed.
Received: 17 October 2012 / Revised: 27 November 2012 / Accepted: 27 November 2012 / Published: 14 December 2012
(This article belongs to the Section Physical Sensors)
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Abstract

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.
Keywords: electron beam welding; electron beam oscillation; plasma charge current; beam focus control; keyhole electron beam welding; electron beam oscillation; plasma charge current; beam focus control; keyhole
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Trushnikov, D.; Belenkiy, V.; Shchavlev, V.; Piskunov, A.; Abdullin, A.; Mladenov, G. Plasma Charge Current for Controlling and Monitoring Electron Beam Welding with Beam Oscillation. Sensors 2012, 12, 17433-17445.

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