Effect of the deviation of the current density profile center on the three-dimensional non-transferred arc plasma torch

Guo, Zhiwei; Yin, Shuo; Liao, Hanlin; Gu, Sai

doi:10.1016/j.compfluid.2015.03.003

Cited by 7 publications

(2 citation statements)

References 30 publications

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“…Therefore, the energy density of coupling arc under this parameter combination is characterized. According to reports [34,35], the spatial current density of arc heat source can be expressed by Formulas 6 and 7:…”

Section: Physical Characteristics Of Double-arc Plasmamentioning

confidence: 99%

Effect of laser on double-arc physical characteristics in pulsed laser-induced double-TIG welding

Liu

et al. 2021

Int J Adv Manuf Technol

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In order to improve the energy utilization efficiency of double-TIG arc, based on the synchronous induction of pulsed laser to double-arc, the coupling-enhanced discharge phenomenon between double-arc is studied in this paper. The energy utilization efficiency of pulsed laser induced double-arc is quantitatively analyzed. The physical characteristics of coupling double-arc are studied based on high-speed camera and spectral diagnosis technology. The physical model is established to discuss the particle migration during the coupling discharge, characterizing the movement state of electrons. The results show that Dla (horizontal distance between the tungsten electrode tip and laser beam axis) has a significant effect on the energy utilization efficiency of the heat source. With the increase of Dla, there are three interaction relationships between the double-arc plasma and keyhole plasma: Mutual interference, Coupling-enhanced discharge and No interaction. A suitable Dla can realize the synchronous induction of laser to double-arc plasma, forming a coupling double-arc, the heat source has a higher energy utilization efficiency. The migration of particles in double-arc can be divided into four stages: Double-arc free discharge stage, Laser-induced initial stage, Laser-induced contraction stage and Laser-induced stable stage. Under the induction of laser, the double-arc forms a common compressed conductive channel. The energy density of coupling double-arc reaches 9.3 times that of traditional double-arc, and the total electron kinetic energy increases by 38% compared with traditional double-arc.

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Section: Physical Characteristics Of Double-arc Plasmamentioning

confidence: 99%

Effect of laser on double-arc physical characteristics in pulsed laser-induced double-TIG welding

Liu

et al. 2021

Int J Adv Manuf Technol

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show abstract

“…coefficient of 10 5 W m 2 and a cooling water temperature of 300 K is used [13]. The electron temperature in the electrodes is in the thermal flux balanced, in which the electron temperatures in the cells surrounding electrodes face are used to set their electron temperature.…”

Section: Governing Equationsmentioning

confidence: 99%

Influence of the inlet gas velocity components on the survival of the vertex of gas in the plasma torch

2019

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The vortex gas injection into plasma torch is considered as a method for reducing electrodes erosion. In order to investigate the effects of vortex gas injection on plasma structure, as well as the effect of gas viscosity on the rate of rotation, a threedimensional nonequilibrium and time-dependent non-transferred DC plasma torch model has been simulated. Viewing the general characteristics of the plasma shows that the model works well. The results have shown that if the components of the inlet gas velocity are not properly selected, it is possible that the rotary effects of the gas are greatly depleted even before the gas reaches the cathode tip and plasma formation. In this case, only the change in the axial component of the gas causes changes in the structure of the plasma. Vortex reduction is also observed during the movement of cold gases. It is observed that the change in viscosity of gas has significant effects on the rate of the vortex.

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Effect of substrate cooling on the epitaxial growth of Ni-based single-crystal superalloy fabricated by direct energy deposition

Nie

Chen

Liu

et al. 2021

Journal of Materials Science & Technology

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Effect of the deviation of the current density profile center on the three-dimensional non-transferred arc plasma torch

Cited by 7 publications

References 30 publications

Effect of laser on double-arc physical characteristics in pulsed laser-induced double-TIG welding

Effect of laser on double-arc physical characteristics in pulsed laser-induced double-TIG welding

Influence of the inlet gas velocity components on the survival of the vertex of gas in the plasma torch

Effect of substrate cooling on the epitaxial growth of Ni-based single-crystal superalloy fabricated by direct energy deposition

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