The Relation Between Electrode Lifetime and Additive Consumption During TIG Welding

Tanaka, Keigo; Yamada, Tetsuo; Shigeta, Masaya; Tanaka, Manabu; Nakabayashi, Seiji

doi:10.2207/qjjws.37.4wl

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…Time-dependent computations using the model clarified that the additive concentrations gradually decreased from the electrode tip as time passed. These computational results showed the same tendency as the experimentally obtained results [4]. They also indicated that the coverage ratio of the additives on the electrode surface decreased dramatically and that the electrode temperature increased at a certain time.…”

Section: Introductionsupporting

confidence: 84%

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: Introductionsupporting

confidence: 84%

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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“…123,124) Especially in a GTA welding, the transport of emitter additives in a tungsten electrode is also important because it affects the stability of arc discharge and the lifetime of the electrode. The investigations were carried out experimentally 125,126) and computationally. 127) Additionally, the thermal energy transferred from an arc plasma to a base metal was measured for a GTA welding condition.…”

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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“…Haidar et al [38] measured the electrode temperature distribution of a free-burning arc with a current of 200 A, electrode diameter of 3.2 mm and tip angle of 60 deg, and found the maximum electrode temperature was about 3600 K that was higher than the melting point of the ThO 2 emitter material. Tanaka et al found that during the high current TIG welding, the tungsten electrode was also melted [39]. As shown in figure 12, in this study, owing to the higher current and the constraint effect by the water-cooled Cu nozzle, the maximum electrode temperature (3960 K) is much higher than the melting point of the ThO 2 emitter material With the aid of the advanced x-ray transmission system, the flow patterns of the tungsten particles in the molten pool can be clearly observed.…”

Section: Validation Of the Numerical Simulationmentioning

confidence: 99%

Coupled mechanisms of the keyhole, energy transfer and compositional change associated with the variable polarity plasma arc process

Wu¹,

Tashiro²,

Hua³

et al. 2021

J. Phys. D: Appl. Phys.

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A three-dimensional numerical model that coupled the arc, keyhole and weld pool was developed to investigate the keyhole behavior and energy transfer of an aluminum alloy in a variable polarity plasma arc welding process. The convective pattern in the weld pool was measured using an advanced x-ray transmission system. The elemental distribution of the bead was determined using an electron-probe microanalyzer. The coupled mechanisms of the keyhole, energy transfer, and compositional change were revealed. With a keyhole, both the arc energy loss and energy input increase, while the total energy transported from the arc to the weld pool decreases a bit, so the arc energy efficiency decreases. The heat flux at the keyhole is low and decentralized, resulting in low keyhole temperature; thus, the loss of elements with low boiling points due to evaporation can be ignored. Elements can be sufficiently mixed and distributed uniformly throughout the bead.

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The Relation Between Electrode Lifetime and Additive Consumption During TIG Welding

Cited by 9 publications

References 7 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

Progress of computational plasma fluid mechanics

Coupled mechanisms of the keyhole, energy transfer and compositional change associated with the variable polarity plasma arc process

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