Numerical simulation of arc characteristics in narrow gap TIG welding

Dong, Bolun; Cai, Xiaoyu; Ni, Zhida; Lin, Sanbao; Fan, Chenglei; Yang, Chunli

doi:10.1016/j.ijmecsci.2019.105031

Cited by 19 publications

(8 citation statements)

References 28 publications

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“… Comparison between simulated and experimental arc pressure of four points, experimental data from [ 7 ]. …”

Section: Figurementioning

confidence: 99%

“…Because the trajectory of the high speed rotating arc approached a circle, they developed a four-point heat source model for the rotating arc and successfully reported the distribution of the temperature field. Dong studied the theoretical foundation of process design for narrow gap gas tungsten arc welding and pointed out that the heat efficiency of the welding arc was different during weaving [ 7 ]. The fluid flow of the molten pool in narrow gap welding was also studied experimentally [ 8 ] and numerically [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of the Heating Characteristics of Magnetic Oscillation Arc and the Fluid Flow in Molten Pool in Narrow Gap Gas Tungsten Arc Welding

Jian

Yang

et al. 2020

Materials

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Magnetic oscillation arc (MOA) technology was developed to avoid insufficient fusion defects appearing at the sidewalls in narrow gap gas tungsten arc welding (NG-GTAW). In this work, a unified model was developed to simulate the process of MOA assisted NG-GTAW. The model included the MOA, welding pool, workpiece and the coupling interaction between them. The heating characteristic of the MOA and the flow of liquid metal were simulated, and the mechanism of forming a uniform welding bead under MOA was investigated. It was found that if the magnetic flux density increased to 9 mT, the MOA could point to the sidewall directly; the maximum heat flux at the bottom declined by almost half and at the side, it increased by more than ten times. Additionally, the heat flux was no longer concentrated but dispersed along the narrow groove face. Under the effect of MOA, there were mainly two flow vortexes in the molten pool, which could further increase the heat distribution between the bottom, sidewall and corner, and was beneficial for the formation of a good-shape weld. The model was validated by experimental data.

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“… Comparison between simulated and experimental arc pressure of four points, experimental data from [ 7 ]. …”

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Heating Characteristics of Magnetic Oscillation Arc and the Fluid Flow in Molten Pool in Narrow Gap Gas Tungsten Arc Welding

Jian

Yang

et al. 2020

Materials

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“…Ogino et.al [17,18] investigated the arc behavior and heat input distribution of a TIG arc with a groove surface based on a 3D numerical model, and found that the maximum heat input was located at side surfaces of the groove, and energy efficiency was increased. Dong et.al [19] proposed that in a narrow gap TIG welding process, as the shape of the workpiece surface changed from concave to convex, the arc root shrank, and the energy efficiency was decreased. During the high speed tandem TIG welding of titanium tubes, the anode surface is convex upward, which may also has a great influence on the energy propagation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Industrial Application of High Speed Tandem TIG Welding

Huang

Kong

et al. 2021

Preprint

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Self-developed high speed tandem TIG welding equipment were adopted to manufacture titanium welded tubes with high efficiency and high quality. The joint made by this high efficient welding process met Chinese standard requirements. A coupled electrode, arc and weld pool numerical model was also developed to investigate temperature and velocity distributions, and energy propagation of this welding process. The numerical results showed that the Marangoni stress was much higher than the arc shear stress, and was mainly positive after leading and trailing arcs in the x and y directions, so the molten metal flowed backward on the top weld pool surface. Previous studies proposed that a “pull-push” flow pattern defined as a backward molten metal flow after the leading arc and a forward molten metal flow before the trailing arc existed on the top weld pool surface in tandem arc welding processes, while it was not observed in this case. The calculated arc efficiency of the high speed tandem TIG welding was about 79.8%.

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“…For instance, Oleg et al developed a model assumed by LTE for cathodic heating and cathode arc attachment to achieve reasonable results of heat and current for the conditions present in Gas Metal Arc (GMA) welding [15]. Bolun et al established an arc plasma simulation model for the application of narrow gap GTA welding and an arc column was assumed in LTE [16]. Junting et al suggested an arc plasma model considering metal vapor which affected the welding process.…”

Section: Introductionmentioning

confidence: 99%

Arc Plasma Flow Variation by Obstruction Structures between Anode and Cathode

Cho

Jeong

Kim

et al. 2021

Metals

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Arc plasma flow between electrodes has been investigated in several studies. However, in the industrial field, arc plasma flow between electrodes is hindered by interfering materials such as filler metal in arc welding, substrates in chemical vapor deposition, and powders in sintering. Therefore, in this study, high temperature arc plasma flow analysis via three obstruction structure shapes was performed to understand the inter-electrode interference phenomena. COMSOL Multiphysics was used for the analysis; COMSOL interface such as electric field, magnetic field, heat transfer, and fluid flow (laminar flow) was applied and Multiphysics such as plasma heat source and temperature coupling were considered. The temperature and velocity of the arc plasma were determined and the energy transfer between the electrodes was analyzed. We confirmed that the concave shape has a lower average heat flux than the other shapes, with the arc pressure evenly distributed in the anode. It is concluded that the concave shape can reduce the flow of the plasma from the anode and obtain even distribution of the arc plasma in the radial direction.

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Numerical simulation of arc characteristics in narrow gap TIG welding

Cited by 19 publications

References 28 publications

Numerical Analysis of the Heating Characteristics of Magnetic Oscillation Arc and the Fluid Flow in Molten Pool in Narrow Gap Gas Tungsten Arc Welding

Numerical Analysis of the Heating Characteristics of Magnetic Oscillation Arc and the Fluid Flow in Molten Pool in Narrow Gap Gas Tungsten Arc Welding

Numerical Simulation and Industrial Application of High Speed Tandem TIG Welding

Arc Plasma Flow Variation by Obstruction Structures between Anode and Cathode

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