Numerical Investigation of Arc-Pool-Metal Vapor Behavior in GTAW with an External Magnetic Field

Han, Yu; Chen, Ji; Li, Linqi; Wang, L.; Wu, Chuansong

doi:10.3390/met10091199

Cited by 5 publications

(4 citation statements)

References 18 publications

(15 reference statements)

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“…The studies of Wang et al [14], Wang et al [15], Murphy et al [16], and Savas et al [17] show that the type and composition of shielding gas affect the gas ionisation degree, which affects the degree of arc shrinkage and the arc temperature distribution. The application of an axial magnetic field will generate radial Lorentz force on the arc plasma and increase the arc axial contraction degree, as reported by [18][19][20][21]. When the transverse magnetic field is applied, the arc will deflect to the side under the action of electromagnetic force.…”

Section: Introductionmentioning

confidence: 93%

“…The commercial Ar is used for the shielding gas with a flow rate of 20 L/min. The thermodynamic and transport properties of Ar are taken from Murphy [19]. The material of the feeding wire and the substrate is 316L stainless steel, and its thermo-physical properties are described in the literature [14].…”

Section: The Experimental System and Boundary Conditionsmentioning

confidence: 99%

“…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%

See 2 more Smart Citations

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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Section: Introductionmentioning

confidence: 93%

Section: The Experimental System and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…Various researchers have studied the plasma arc and the weld pool regions in steady or transient states, via computer simulations [14,15]. Substantial work is available in the study of heat transfer and fluid flow in gas metal arc welding (GMAW) with consumable wire [16][17][18][19][20][21][22], but minimal work can be found for GTAW.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Melt Flow and Heat Transfer in Stationary Gas Tungsten Arc Welding with Vertical and Tilted Torches

et al. 2021

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A 3D numerical simulation was conducted to study the transient development of temperature distribution in stationary gas tungsten arc welding with filler wire. Heat transfer to the filler wire and the workpiece was investigated with vertical (90°) and titled (70°) torches. Heat flux, current flux, and gas drag force were calculated from the steady-state simulation of the arc. The temperature in the filler wire was determined at three different time intervals: 0.12 s, 0.24 s, and 0.36 s. The filler wire was assumed not to deform during this short time, and was therefore simulated as solid. The temperature in the workpiece was calculated at the same intervals using heat flux, current flux, gas drag force, Marangoni convection, and buoyancy. It should be noted that heat transfer to the filler wire was faster with the titled torch compared to the vertical torch. Heat flux to the workpiece was asymmetrical with both the vertical and tilted torches when the filler wire was fully inserted into the arc. It was found that the overall trends of temperature contours for both the arc and the workpiece were in good agreement. It was also observed that more heat was transferred to the filler wire with the 70° torch compared with the 90° torch. The melted volume of the filler wire (volume above 1750 °K) was 12 mm3 with the 70° torch, compared to 9.2 mm3 with the 90° torch.

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Design and construction for theory and method of magnetic-controlled negative pressure GTAW arc model based on multi-physics simulation

Xu,

Luo,

Cui

et al. 2024

Int J Adv Manuf Technol

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Numerical Investigation of Arc-Pool-Metal Vapor Behavior in GTAW with an External Magnetic Field

Cited by 5 publications

References 18 publications

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

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

Modeling of Melt Flow and Heat Transfer in Stationary Gas Tungsten Arc Welding with Vertical and Tilted Torches

Design and construction for theory and method of magnetic-controlled negative pressure GTAW arc model based on multi-physics simulation

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