Modeling and finite element analysis on GTAW arc and weld pool

Lu, Fenggui; Yao, Shun; Song-nian, Lou; Li, Yong Bing

doi:10.1016/j.commatsci.2003.10.009

Cited by 67 publications

(34 citation statements)

References 9 publications

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“…in both systems. Rewriting Equation 13 for the absolute model and substituting in Equations 1 and 2 results in Equation 21,…”

Section: Similitude Modelling Equationsmentioning

confidence: 99%

“…This model is to avoid the temperature boundary condition at the cathode (3,500 K) that is assumed by many researchers [19][20][21] to resolve the issue of zero electric conductivity at room temperature. The model is represented in Figure 3 and its boundary conditions are listed in Table 1 …”

Section: Initial Electric Conductivity Modelmentioning

confidence: 99%

“…Considering the previous research a number of these works have simulated the arc-plasma region with imposed temperature values at the cathode and anode boundaries [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…Herein the lightning strike electric arc model is based on the preceding Gas Tungsten Arc (GTA) models available in the literature [19][20][21][22][23][24][25][26][27][28][29]. In general the preceding plasma modelling has assumed the thermal plasma to be in local thermodynamic equilibrium.…”

Section: Introductionmentioning

confidence: 99%

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A Multiphysics Simulation Approach for Efficient Modeling of Lightning Strike Tests on Aircraft Structures

Abdelal

Murphy

2017

IEEE Trans. Plasma Sci.

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A numerical approach is proposed and demonstrated for efficient modelling of the thermal plasma behaviour present during a lightning strike event. The approach focuses on events with time-scales from microseconds to milliseconds and combines the finite element method, Magnetohydrodynamics and Similitude theory. Similitude theory is used to scale the problem to require considerably less computing resource. To further reduce the computational burden and to resolve the numerical difficulty of simulating the nearly zero electrical conductivity of air at room temperature an approach based on cold field electron emissions is introduced. Simulations considering turbulent flow have been considered, modelling a test configuration from literature designed to inspect composite material performance and applying an aerospace standard test profile (waveform-B). Predicted peak temperatures (of the order of ~40,000 K) and pressures (of the order of 0.1-0.2 MPa) suggest that the pressure loading during a waveform-B event will have a minimal effect on composite material damage.

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“…in both systems. Rewriting Equation 13 for the absolute model and substituting in Equations 1 and 2 results in Equation 21,…”

Section: Similitude Modelling Equationsmentioning

confidence: 99%

Section: Initial Electric Conductivity Modelmentioning

confidence: 99%

“…Considering the previous research a number of these works have simulated the arc-plasma region with imposed temperature values at the cathode and anode boundaries [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Multiphysics Simulation Approach for Efficient Modeling of Lightning Strike Tests on Aircraft Structures

Abdelal

Murphy

2017

IEEE Trans. Plasma Sci.

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“…The first one considers an explicit modelling approach of heat and mass transfer: electromagnetic fluxes inside the arc plasma are computed. They are next taken into account as the main heat source [4,5,7,8]. The second approach, such as the one presented in the present paper, uses analytical models to simulate the heat source and material supply: arc plasma phenomena are not explicitly modelled.…”

Section: Introductionmentioning

confidence: 99%

A level set approach for the simulation of the multipass hybrid laser/GMA welding process

Desmaison¹,

Bellet²,

Guillemot³

2014

Computational Materials Science

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A new 3D finite element model, developed in a level set approach, is proposed to model hybrid gas metal arc / laser welding in multipass conditions. This heat and mass transfer model couples the resolution of the heat conservation equation, the momentum and mass conservation equations and the weld bead development. The arc welding total power is divided in two parts: one corresponding to the energy transferred to the fusion zone by droplets of melted filler material, the rest being transferred to the workpiece by the surrounding plasma. The droplets energy input is modelled as a volumetric heat source. Regarding the heat surface fluxes associated with plasma and laser heating, the "Continuum Surface Force" approach is used to model them as volumetric heat sources concentrated in the immediate neighbourhood of the metal-gas interface. A resolution scheme, consisting in ignoring high velocity fluid flow in the fusion zone, through the use of an augmented liquid viscosity, is proposed and discussed. Accordingly, the liquid thermal conductivity is enhanced to result in a realistic heat transfer to the workpiece. The formation of the weld bead is obtained through the introduction of a source term in the mass conservation equation, and the application of the normal component of surface tension forces, proportional to the mean curvature of the metal-gas interface. This approach is proposed to reduce computation time. The resolution scheme is applied to the simulation of hybrid welding of 18MND5 (ASME SA 533) steel grade. Results are compared to experimental measurements and observations operated in conditions close to industrial ones. The influence of the enhancement applied to the liquid conductivity coefficient is shown and discussed. A strong sensitivity evolution is demonstrated when varying it from the physical value to the value proposed in the welding literature. As proposed, the simplified resolution scheme leads to a good estimation of the weld bead surface development. Nevertheless, there are still noticeable differences with the whole set of experimental results that are discussed and can be explained by model limitations and insufficient knowledge of material and interfacial properties.

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Thermal Process Analysis in Welding Prototyping of Metal Structures

Zhang

et al. 2011

Lecture Notes in Electrical Engineering

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Modeling and finite element analysis on GTAW arc and weld pool

Cited by 67 publications

References 9 publications

A Multiphysics Simulation Approach for Efficient Modeling of Lightning Strike Tests on Aircraft Structures

A Multiphysics Simulation Approach for Efficient Modeling of Lightning Strike Tests on Aircraft Structures

A level set approach for the simulation of the multipass hybrid laser/GMA welding process

Thermal Process Analysis in Welding Prototyping of Metal Structures

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