Mixing of multiple metal vapours into an arc plasma in gas tungsten arc welding of stainless steel

Park, Hunkwan; Trautmann, M.; Tanaka, Keigo; Tanaka, Manabu; Murphy, Anthony B.

doi:10.1088/1361-6463/aa8b06

Cited by 20 publications

(17 citation statements)

References 38 publications

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“…This result suggests the presence of chromium ions near the electrode deformation region. It has also been reported that chromium ions are transported to the electrode by cataphoresis inside helium TIG arc plasma [9, 10]. For example, in thin film formation, metal ions are deposited on a solid surface when metal ions accelerated by an electric field collide with the solid surface [14].…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, results clarified that, especially, chromium ions reached the arc centre and the electrode tip as time passed [7,8]. The transport mechanism of metal vapour inside an arc plasma was clarified using a two-dimensional axisymmetric computational model with a combined diffusion coefficient method developed by Park et al [9,10]. The combined diffusion coefficient method incorporates diffusion caused by four driving forces: gradient of the composition, temperature, pressure, and the applied electric field [11].…”

Section: Introductionmentioning

confidence: 99%

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Electrode contamination caused by metal vapour transport during tungsten inert gas welding

Tanaka

Shigeta

Komen

et al. 2021

Science and Technology of Welding and Joining

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Tungsten electrode contamination caused by metal vapour from a base metal during a tungsten inert gas welding was investigated. The metal ions transported from the weld pool surface were deposited on the tungsten electrode surface during welding. The tungsten fraction of the electrode surface layer was decreased because the deposited metal vapour diffused inside the tungsten electrode. The melting point of the electrode surface layer was lowered, decreasing to the electrode operating temperature. Results show that the electrode melted and deformed. This electrode contamination was promoted when a larger amount of metal ions was transported to the electrode surface.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrode contamination caused by metal vapour transport during tungsten inert gas welding

Tanaka

Shigeta

Komen

et al. 2021

Science and Technology of Welding and Joining

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“…copper and nickel, which evaporate at different rates. Including both of them self-consistently would be very difficult, although not impossible [43]. However we can use of a uniform distribution of copper vapour as an approximate approach to understanding the influence of metal vapour.…”

Section: Cfd Simulationmentioning

confidence: 99%

Modelling and experimental investigations of composition-dependent heat and mass transfer during Cu–Ni alloy nanoparticle synthesis in a transferred arc helium plasma

Dhamale¹,

Das²,

Murphy³

et al. 2022

J. Phys. D: Appl. Phys.

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In the synthesis of alloy nanoparticles via arc evaporation and fast quenching, the composition of the synthesized nanoparticles differs significantly from that of the precursor. The properties of the nanoparticles formed following evaporation of a copper-nickel anode by a helium arc are investigated using a nucleation model coupled to the thermal and flow fields derived from a magneto-hydrodynamic simulation of the arc, and experimentally. Results are obtained for three different Cu:Ni precursor compositions, 10:90, 50:50 and 90:10 at%. The synthesized particles are spherical with different size distributions and have a higher concentration of Cu than the precursor in all three cases, in contrast to previous observations, but in accordance with the predictions of the model. Emission spectroscopic measurements of copper and nickel lines indicate that the concentration of atomic copper in the plasma region near the anode is much higher than that of the nickel, in accordance with the predictions of the model. The higher vapour pressure of copper compared to nickel, and its higher activity in the alloy precursor (anode), immersed in a self-consistent thermal and flow field maintained by the transferred arc are found to play a critical role. The thermodynamic, radiative and transport properties of the helium plasma contaminated with evaporated precursor are important in determining the thermal and flow fields.

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“…Temperature distribution and the pool geometry do change with time during welding. Heat transfer occurs during the welding process due to different temperature distributed in the workpiece by local heating [17,18]. The fundamental modes of heat transfer are conduction, convection and radiation.…”

Section: Theoretical Analysismentioning

confidence: 99%

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2021

EJMSE

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Simulation of welding temperature fields during TIG arc the welding process of Cr-Mo steel bar (ASTM A304) was studied. The results of Simulation models of welding processes help to predict welding parameters effects on the temperature field during and after welding and by this, the failure rate could be estimated and minimized. This paper presents the welding profile model, assembled from 100 mm by 50 mm by 20 mm thick, a Double-Sided Half V-Groove Weld Joint, moving heat source was employed to methodically examine welding temperature fields and transformation in the single-pass butt-welded joint. Unfortunately, the precision of the model rests on many parameters, which cannot be precisely dictated. To resolve this proposition, a calibration process was made by using a Datalogger type K thermocouple -3 channel-LU-MTM-380SD during the welding process on Cr-Mo steel bar. The obtained Experimental results were used as input to run the simulation. Depending on weld joint profile, temperature fields were discovered to vary with distance from the weld centerline which altered the yield stress of weld metal. To realize this goal, a pattern of the 3D model of heat transfer with a moving heat source during welding was simulated in Autodesk Inventor Simulation CFD 2018 Application Software. The results shown that the welding temperature fields have a higher value at the welding center line and decreased towards the edges of the bar. An indication that simulation is a veritable tool to access likely consequence of the welding process at both welded and non-welded portions of steel bar before real machine structural development.

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Mixing of multiple metal vapours into an arc plasma in gas tungsten arc welding of stainless steel

Cited by 20 publications

References 38 publications

Electrode contamination caused by metal vapour transport during tungsten inert gas welding

Electrode contamination caused by metal vapour transport during tungsten inert gas welding

Modelling and experimental investigations of composition-dependent heat and mass transfer during Cu–Ni alloy nanoparticle synthesis in a transferred arc helium plasma

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