Control of electron beam welding using plasma phenomena in the molten pool region

Belen'kii, V Ya; Yazovskikh, V. M.

doi:10.1080/09507119709452013

Cited by 5 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both second and first harmonics were clearly observed in the secondary-emission signal at the welding process with the oscillation along the joint, while their ratio depended on the focus mode. The spectrum and waveforms of the secondary current in plasma during EBW are more fully described elsewhere in literature [24–27,39,40]. In the following study, research into the secondary signal was conducted using coherent accumulation.…”

Section: Resultsmentioning

confidence: 99%

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

Трушников

Belenkiy

Shchavlev

et al. 2012

Sensors

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

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

Трушников

Belenkiy

Shchavlev

et al. 2012

Sensors

View full text Add to dashboard Cite

show abstract

“…Frequencies up to 20 kHz are inherent to these processes, which makes it possible to study them using X-ray radiation sensors. Methods based on registration of the secondary plasma current originating above the welding zone [5] are promising. Several methods have been developed to study and control electron beam welding [1][2][3][4][5] processes.…”

Section: Introductionmentioning

confidence: 99%

“…Several hypotheses have been put forward to describe the observed phenomena. However, the proposed theories are insufficient to fully interpret the obtained results [4,5]. We need a detailed model of the processes occurring in the plasma.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Influence of the Penetration Channel’s Shape on Plasma Parameters When Handling Highly Concentrated Energy Sources

Трушников

Саломатова

Bezukladnikov

et al. 2017

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

In our work to formulate a scientific justification for process control methods when processing materials using concentrated energy sources, we develop a model that can calculate plasma parameters and the magnitude of the secondary waveform of a current from a non-self-sustained discharge in plasma as a function of the geometry of the penetration channel, thermal fields, and the beam's position within the penetration channel. We present the method and a numeric implementation whose first stage involves the use of a two-dimensional model to calculate the statistical probability of the secondary electrons' passage through the penetration channel as a function of the interaction zone's depth. Then, the discovered relationship is used to numerically calculate how the secondary current changes as a distributed beam moves along a three-dimensional penetration channel. We demonstrate that during oscillating electron beam welding the waveform has the greatest magnitude during interaction with the upper areas of the penetration channel and diminishes with increasing penetration channel depth in a way that depends on the penetration channel's shape. When the surface of the penetration channel is approximated with a Gaussian function, the waveform decreases nearly exponentially.

show abstract

Al x CrFeCoNi High-Entropy Alloys: Surface Modification by Electron Beam Bead-on-Plate Melting

Nahmany

Hooper

Stern

et al. 2016

Metallogr. Microstruct. Anal.

View full text Add to dashboard Cite

Control of electron beam welding using plasma phenomena in the molten pool region

Cited by 5 publications

References 1 publication

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

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

Modeling the Influence of the Penetration Channel’s Shape on Plasma Parameters When Handling Highly Concentrated Energy Sources

Al x CrFeCoNi High-Entropy Alloys: Surface Modification by Electron Beam Bead-on-Plate Melting

Contact Info

Product

Resources

About