A numerical study of the effects of cathode geometry on tungsten inert gas type electric arcs

Nahed, Christopher; Gounand, Stéphane; Médale, Marc

doi:10.1016/j.ijheatmasstransfer.2021.121923

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…(1) calculating the Lorentz force which plays a key role to describe the behavior of arcing and maintaining of the arc [33]; (2) accounting for the Joule effect to properly solve the energy equation in the plasma flow. On the other hand, two additional transport equations were included to model electromagnetic couplings.…”

Section: Governing Equationsmentioning

confidence: 99%

Electromagnetic–Computational Fluid Dynamics Couplings in Tungsten Inert Gas Welding Processes—Development of a New Linearization Procedure for the Joule Production Term

Tchoumi,

Peyraut,

Bolot

2024

Applied Mechanics

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The finite volume method (FVM) was used to model a tungsten inert gas (TIG) arc welding process. A two-dimensional axisymmetric model of arc plasma integrating fluid–solid coupling was developed by solving electromagnetic and thermal equations in both the gas domain and the solid cathode. In addition, two additional coupling equations were considered in the gaseous domain where the arc is generated. This model also included the actual geometry of torch components such as the gas diffuser, the nozzle, and the electrode. The model was assessed using numerous numerical examples related to the prediction of the argon plasma mass fraction, temperature distribution, velocity fields, pressure, and electric potential in the plasma. A new linearization method was developed for the source term in the energy conservation equation, allowing for the prediction of Joule effects without artificial conductibility. This new method enhances the efficiency of the classical approach used in the literature.

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Section: Governing Equationsmentioning

confidence: 99%

Electromagnetic–Computational Fluid Dynamics Couplings in Tungsten Inert Gas Welding Processes—Development of a New Linearization Procedure for the Joule Production Term

Tchoumi,

Peyraut,

Bolot

2024

Applied Mechanics

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“…It has a particular influence on the axial shrinkage, and the length of the arc, but the arc shape is still a bell shape. It is widely known that the arc shape is greatly affected by external factors, which mainly include the electrode size and shape, the type of shielding gas, and the applied electric/magnetic field [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Christopher et al [8] found that the smaller the tip truncation angle of the electrode, the higher the arc contraction degree, and the higher the arc centre temperature and current density.…”

Section: Introductionmentioning

confidence: 99%

“…It is widely known that the arc shape is greatly affected by external factors, which mainly include the electrode size and shape, the type of shielding gas, and the applied electric/magnetic field [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Christopher et al [8] found that the smaller the tip truncation angle of the electrode, the higher the arc contraction degree, and the higher the arc centre temperature and current density. Hu et al [9,10] and Cadiou et al [11] affirmed that the arc remains a bell shape when the droplet enters the molten pool in a free transfer manner.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Influence of the as-Deposited Wall Thickness on Arc Shape and Stability during Wire Arc Additive Manufacturing

Zhou

Zhang

Peng

et al. 2022

Metals

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The single-pass multi-layer depositing strategy is usually used to fabricate thin-wall structures with wire and arc additive manufacturing (WAAM) technology. Various deposited wall thicknesses often lead to a change in arc shrinkage in the wall thickness direction, which affects the arc shape and stability, and even the microstructure and properties. To systematically study the effect of wall thickness (δ) on arc shape and stability, 3D numerical models were established, with wall thickness varying from 1 to 14 mm during the WAAM process. The characteristics of the arc shape, temperature field, velocity field, current density, and the electromagnetic force were investigated. When δ is smaller than the arc diameter (Φ), the thinner wall will result in a longer arc along the deposition direction. When δ is greater than the Φ, the arc shape tends to be a bell shape. When δ < Φ, the peak temperature in the arc centre, the peak current density, and the electromagnetic intensity along the welding direction decreased with the increase in the wall thickness. However, the opposite observations were found when δ < Φ. The simulation results are consistent with the actual arc shape collected and showed that when δ is slightly less than Φ, the forming quality of the deposited wall is the best. The research in this paper can fill the research gap and provide a theoretical basis for the matching selection of process parameters and wall thickness in WAAM applications.

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Numerical simulation of effect of discharge gap on arc characteristics of sheet tungsten electrode under vertical sidewall anode configuration

Zheng

et al. 2022

Int J Adv Manuf Technol

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A numerical study of the effects of cathode geometry on tungsten inert gas type electric arcs

Cited by 5 publications

References 26 publications

Electromagnetic–Computational Fluid Dynamics Couplings in Tungsten Inert Gas Welding Processes—Development of a New Linearization Procedure for the Joule Production Term

Electromagnetic–Computational Fluid Dynamics Couplings in Tungsten Inert Gas Welding Processes—Development of a New Linearization Procedure for the Joule Production Term

Simulation of the Influence of the as-Deposited Wall Thickness on Arc Shape and Stability during Wire Arc Additive Manufacturing

Numerical simulation of effect of discharge gap on arc characteristics of sheet tungsten electrode under vertical sidewall anode configuration

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