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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Tanaka, Manabu
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Topics
Publications (10/10 displayed)
- 2024Synthesis of ternary titanium–niobium nitride nanoparticles by induction thermal plasma
- 2022Numerical Analysis of Metal Transfer Process in Plasma MIG Weldingcitations
- 2021Effect of alkaline elements on the metal transfer behavior in metal cored arc weldingcitations
- 2021Relationship among welding defects with convection and material flow dynamic considering principal forces in plasma arc weldingcitations
- 2020Numerical study of the metal vapour transport in tungsten inert-gas welding in argon for stainless steelcitations
- 2020Numerical study of the effects and transport mechanisms of iron vapour in tungsten inert-gas welding in argoncitations
- 2020Multiwall Carbon Nanotube Composites as Artificial Joint Materials.citations
- 2018A computational model of gas tungsten arc welding of stainless steel: the importance of treating the different metal vapours simultaneouslycitations
- 2017Mixing of multiple metal vapours into an arc plasma in gas tungsten arc welding of stainless steelcitations
- 2015Numerical analysis of fume formation mechanism in TIG weldingcitations
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article
A computational model of gas tungsten arc welding of stainless steel: the importance of treating the different metal vapours simultaneously
Abstract
A two-dimensional computational model of the mixing of multiple metal vapours into a helium arc in gas tungsten arc welding of stainless steel is presented. The combined diffusion coefficient method, extended to three-gas mixtures, is used to treat helium–chromium–iron and helium–manganese–iron mixtures. It is found that all the metal vapours penetrate to the arc centre and reach the cathode, with iron vapour confined near the cathode tip, while chromium and manganese vapours accumulate about 1.5 mm above the tip. The predicted distributions of chromium, manganese and iron show reasonable agreement with published photographic images and radial distributions of atomic line emission intensities. The results are also consistent with published measurements of the deposition of the metals on the cathode surface, which are explained in terms of the boiling points of the metals and the distributions of their vapours in the arc. A detailed examination of the influence of the different diffusion coefficients, net emission coefficients and vapour pressures of the metals on the metal vapour transport in the arc plasma is presented. It is shown that cataphoresis (diffusion due to applied electric fields) leads to the penetration of the metal vapours into the arc. The different distribution of iron vapour from those of chromium and manganese vapours near the cathode is strongly influenced by the lower ordinary diffusion coefficients of iron at lower temperatures. The radiative emission is found to be important since it leads to cooling of the arc, which decreases the influence of cataphoresis. The vapour pressure only influences the concentration of the metal vapour close to the workpiece. Finally, results for the two-gas helium–chromium and helium–iron systems are compared to those for the three-gas helium–chromium–iron system. It is shown that it is important to consider the different metal vapours simultaneously to obtain an accurate calculation of the metal vapour distributions and arc temperature.