Plasma–weld pool interaction in tungsten inert-gas configuration

Mougenot, Jonathan; Gonzalez, Jean‐Jacques; Freton, Pierre; Masquère, Mathieu

doi:10.1088/0022-3727/46/13/135206

Cited by 43 publications

(41 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Such idealization did not incorporate any conditions of running of real welding arcs, and required further improvement of mathematical models of the arc, in order to allow for a number of additional physical factors, related to multicomponent nature of arc plasma. Publications devoted to allowing for evaporation of anode material in simulation of nonconsumableelectrode welding arc, appeared in the world scientific literature comparatively recently [11][12][13]. When describing diffusion of ionized metal vapour in arc plasma, however, these works do not differentiate between vapour atoms and ions, having diffusion coefficients, differing significantly by their magnitude [1].…”

Section: Abstract : Electric Arc Refractory Cathode Evaporatmentioning

confidence: 99%

Simulation of electric arc with refractory cathode and evaporating anode

Krikent¹,

Krivtsun²,

Demchenko³

2014

The Paton Welding J.

View full text Add to dashboard Cite

Equation of convective diffusion of ionized metal vapour in arc plasma, allowing for the difference in coefficients of diffusion of atoms, single-and double-charged metal ions, presence of thermodiffusion flows of metal particles, as well as ion drift in the electric field, was proposed to more precisely define the earlier developed complex model of the processes of energy, mass and charge transfer in the column and anode region of electric arc with refractory cathode and evaporating anode, running in inert gas. Based on the thus precised complex mathematical model, numerical analysis of the influence of diffusion-induced evaporation of anode material (Fe) on heat, gas-dynamic and electromagnetic characteristics of multicomponent plasma of the column and anode region of stationary electric arc with refractory cathode (W) at its running in inert gas (Ar) was performed. An essential influence of metal surface temperature distribution in the region of anode binding of the arc on distribution of temperature and electric current density in near-anode plasma, as well as on distributed and integral characteristics of its thermal impact on evaporating anode surface, is shown. 18 Ref., 12 Figures. K e y w o r d s : electric arc, refractory cathode, evaporating anode, arc column, anode region, multicomponent plasma, metal vapour, diffusion, mathematical simulationElectric arc plasma in inert-gas nonconsumableelectrode welding, as a rule, is multicomponent, as alongside shielding gas particles, it contains atoms and ions of metal vapour coming to the arc gap due to evaporation of anode metal from weld pool surface. Presence of an even small amount of metal component in inert gas arc plasma has an essential influence on its ionization composition, thermodynamic, transport and optical properties. It leads to a significant difference of heat, electromagnetic and gas-dynamic characteristics of plasma in near-anode zone of arc column in nonconsumable-electrode welding from respective characteristics of arc discharge with refractory cathode and nonevaporating, for instance, water-cooled anode. Characteristics of welding arc anode region, determining the conditions of thermal and electromagnetic interaction of the arc with metal being welded and, consequently, nature of its penetration, are also different [1].In the first publications, devoted to mathematical simulation of the processes of heat, mass and charge transfer in refractory cathode arcs [2-10], arc plasma was assumed to be single-component, i.e. containing atoms and ions of just the shielding gas. Such idealization did not incorporate any conditions of running of real welding arcs, and required further improvement of mathematical models of the arc, in order to allow for a number of additional physical factors, related to multicomponent nature of arc plasma. Publications devoted to allowing for evaporation of anode material in simulation of nonconsumableelectrode welding arc, appeared in the world scientific literature comparatively recently [11][12][13]. When describing...

show abstract

Section: Abstract : Electric Arc Refractory Cathode Evaporatmentioning

confidence: 99%

Simulation of electric arc with refractory cathode and evaporating anode

Krikent¹,

Krivtsun²,

Demchenko³

2014

The Paton Welding J.

View full text Add to dashboard Cite

show abstract

“…According to, e.g., Edstorp [4], since the state of the related quantities is strongly influenced by phenomena such as arc and droplet impingement, non-isothermal phase change, surface tension, Marangoni forces, and Lorentz forces, much effort is necessary for modeling the phenomenon. Mougenot et al [10] stated that, when surface deformation is assumed negligible, the weld pool movement is driven by four forces: the Marangoni (due to the of surface tension gradient); the drag force (due to the interaction of the plasma velocity with the surface); the Laplace; and buoyancy. As conclusion, they highlighted the influence of the parameters used in the Marangoni formulation.…”

Section: Resultsmentioning

confidence: 99%

“…As conclusion, they highlighted the influence of the parameters used in the Marangoni formulation. It is important to state that Mougenot et al [10] investigated autogenous TIG modeling.…”

Section: Resultsmentioning

confidence: 99%

A contribution to the study of negative polarity in GMA welding

Li¹,

Hurtig

Högström

et al. 2017

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Gas metal arc welding (GMAW) using the electrode with negative polarity (DCEN) has been frequently suggested as a potential means of increasing production capacity. The objective of this work was to further study the performance of negative polarity in GMAW of carbon steels. In this project phase, bead-on-plate welds were carried out in flat position to assess the effect of different potential shielding gas compositions on bead geometry, finishing and spattering. The characteristics were compared with DCEP at the same current, but depositing the same volume of material per unit of length (more industrial related comparison). The arc length was kept the same by adjusting voltage to reach shortest arcs, yet with suitable non short-circuiting metal transfer mode. An approach to measure bead convexity was also proposed and assessed. The results showed that DCEN is feasible as a means of increasing GMAW production capacity. However, to become DCEN applicable with GMAW, the results suggest an Ar-based blend with around 6.5% of O 2 is the most appropriate shielding gas, as much as that there is a demand for a standard electronic controlled power source able to work in constant current mode.

show abstract

“…High-speed imaging is a relevant method in that kind of issue [7], [8]. Existence of numerical models [1], [9], [10] also allow us to compare our results. Fig.…”

mentioning

confidence: 98%

“…It is thus essential to understand those phenomena to control the process. Currently, several models can be found in the literature describing only the material [4], [5] or the whole process with the interaction [9], [10]. Nevertheless, due to the lack of experimental data, only few literature works are related to the confrontation and comparison on the weld pool movements.…”

mentioning

confidence: 99%

High-Speed Camera on Molten Pool in Transferred Arc Configuration

Stadler

Masquère

Mougenot

et al. 2014

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

During tungsten inert gas (TIG) welding process, heat transfer between plasma and the work piece leads to a metallic weld pool. Combination of different forces produces movements on the molten pool surface. Following the predominance of the forces, the depth and width of the weld pool differ, affecting the weld quality. One of our aims is to observe the flow motion applying different experimental conditions and nature of materials. This provides a set of observations that allows us to quantify the velocity, the weld pool shape, and dimensions. These quantities are essential to validate numerical models used to adjust TIG parameters. In this paper, visualization of an AISI 304L stainless steel molten pool with high-speed imaging, velocity estimation, and microscopic observation are presented.Index Terms-Image processing, iron alloys, plasma welding.

show abstract

Plasma–weld pool interaction in tungsten inert-gas configuration

Cited by 43 publications

References 44 publications

Simulation of electric arc with refractory cathode and evaporating anode

Simulation of electric arc with refractory cathode and evaporating anode

A contribution to the study of negative polarity in GMA welding

High-Speed Camera on Molten Pool in Transferred Arc Configuration

Contact Info

Product

Resources

About