Modelling and measurements of gas tungsten arc welding in argon–helium mixtures with metal vapour

Xiang, Junting; Tanaka, Keigo; Chen, Fiona F.; Shigeta, Masaya; Tanaka, Manabu; Murphy, Anthony B.

doi:10.1007/s40194-020-01053-4

Cited by 14 publications

(3 citation statements)

References 39 publications

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“…．溶接アークプラズマに対して発光分光分析を適用することで，近年では重ねすみ肉アーク溶接時のガスシールド性 16) やガスメタルアーク溶接現象に与えるシールドガス組成の影響 17) ，ティグ溶接中の金属蒸気輸送およびそれに伴う電極消耗メカニズム [18][19][20][21][22][23][24] Table 6 Ionization energies of cerium and thorium 31) .…”

unclassified

Identification of light emitting elements around tungsten electrode during TIG welding using optical emission spectroscopy

Tanaka

Shigeta

Komen

et al. 2021

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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Identification of light emitting elements around tungsten electrode during TIG welding using optical emission spectroscopy

Tanaka

Shigeta

Komen

et al. 2021

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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“…4,5) Simulations were also used to obtain numerical information in arc plasmas, which could hardly be measured. 8,9,[111][112][113][114][115][116][117][118] The molten metals produced during arc welding have also been investigated. The melting and deforming behaviors of weld pools and molten fluxes in SA welding were captured by an Xray transmission imaging technnique 119,120) to support the mechanism clarifications.…”

Section: Mpbulkmentioning

confidence: 99%

Progress of computational plasma fluid mechanics

Shigeta

2023

Jpn. J. Appl. Phys.

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This article reviews and discusses the recent progresses of studies with the concept of “Computational plasma fluid mechanics”. Computational demonstrations show that the inhouse simulation codes such as PLASTIPC (PLasma All-Speed Turbulence with Implicit Pressure Code) have captured hydrodynamic instabilities and reproduced flow dynamics in thermal plasma – nonionized gas coexisting systems. A unique method has made it feasible to study collective growth of binary alloy nanoparticles by numerical analysis. SPH (Smoothed Particle Hydrodynamics) method with incompressibility modification has achieved complex behaviors of molten metal involving phase change, flow, heat transport, material mixing, and large deformation during arc welding. It is essential to study thermal plasma processes as comprehensive fluid systems in which hot plasma, cold nonionized gas, and materials coexist. The viewpoint and approaches of fluid mechanics as well as plasma physics are indispensable. Computational study will play a more important role in giving us new and deeper insights.

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“…It was preferred over argon as it offers faster evaporation of the anode precursor. Helium's higher specific heat capacity and thermal conductivity and reduced electrical conductivity compared to argon result in an increased arc voltage and higher heat flux to the anode substrate [39,40].…”

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.

show abstract

Modelling and measurements of gas tungsten arc welding in argon–helium mixtures with metal vapour

Cited by 14 publications

References 39 publications

Identification of light emitting elements around tungsten electrode during TIG welding using optical emission spectroscopy

Identification of light emitting elements around tungsten electrode during TIG welding using optical emission spectroscopy

Progress of computational plasma fluid mechanics

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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