Modelling of electromagnetic processes in system ‘welding arc – evaporating anode’ Part 1 – Model of anode region

Krivtsun, I.V.; Demchenko, V.; Lesnoi, A.; Krikent, I.V.; Poritsky, P.V.; Mokrov, Oleg; Reisgen, Uwe; Zabirov, Alexander; Pavlyk, V.

doi:10.1179/136217110x12665778348506

Cited by 17 publications

(9 citation statements)

References 21 publications

(51 reference statements)

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“…Furthermore, we consider the temperature-dependant surface tension for the system argon-iron determined by Siewert et al [7] whose values are much higher (1.6 to 1.8 Nm) than the constant value of 1.2 Nm used in previously numerical models [8][9][10][11][12][13][14][15][16].…”

Section: Droplet Transfer Modelmentioning

confidence: 99%

“…the current path and the attachment of the arc at the wire electrode, dramatically change with increasing vaporization rates [12]. Krivtsun et al [13] present a complex model of the electric charge transfer in the anode region of an evaporating anode and couple it with a simplified arc model in which the changes in the electrode shapes are omitted as well [14]. In accordance to [11,12], it becomes evident that the arc attachment at the wire electrode is essentially determined by the metal vaporization.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of arc and droplet transfer in pulsed GMAW of mild steel in argon

2016

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The process capability of gas metal arc welding (GMAW) processes is mainly determined by the arc properties and the material transfer. In recent years, numerical methods are being used increasingly in order to understand the complex interactions between the arc and material transfer in gas metal arc welding. In this paper, we summarize a procedure to describe the interaction between an arc and a melting and vaporizing electrode. Thereafter, the presented numerical model is used to investigate the arc properties and the metal transfer for a pulsed GMAW process of mild steel in argon. The results of the numerical simulation are compared with OES measurements as well as high-speed images at different times in the pulse cycle and show excellent agreement. The results illustrate the high influence of the changing vaporization rate on the arc attachment at the wire electrode in the high current phase. It could be shown that a substantial part of the current does not participate in the constriction of the wire electrode via the resulting lorentz force which explains the nearly spatter-free droplet detachment in pulsed GMAW processes of mild steel in argon shielding gas.

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Section: Droplet Transfer Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical simulation of arc and droplet transfer in pulsed GMAW of mild steel in argon

2016

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“…A mechanism involving surface oxides has also been reported 14. The anode spot is the least understood aspect of the electrode in GMAW, and there is no agreement on what equations to use to represent it, even in the absence of oxides 10, 11, 15, 16. Volumetric energy inputs in the melt from joule heating and frictional heating are typically neglected.…”

Section: Multiphysics In Weldingmentioning

confidence: 99%

Synthesis and generalisation of welding fundamentals to design new welding technologies: Status, challenges and a promising approach

Méndez

2011

Science and Technology of Welding and Joining

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The present paper addresses the renewed need to focus on the physics of welding to realise the full potential of the latest welding technologies which include fibre and disc lasers, friction stir welding and inverter power supplies. The approach to understanding, synthesis and generalisation in other engineering branches is reviewed, highlighting the central role of handbook type solution in the conceptual design stage. It is shown that the multiphysics and multicoupled aspects of welding exceed the capabilities of other engineering approaches and the methodology of scaling is proposed as a promising alternative. The application of scaling to friction stir welding is shown through an example in which the maximum temperature in the metal is generalised into a power law, experimental and numerical data are synthesised into a general correction factor, and secondary effects are captured as dimensionless groups.

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“…Being the cheapest among inert gases, argon has a wide practical application in plasma technologies (see, for example, [1][2][3][4][5][6]). Therefore, this plasma has become the object of numerous physical studies.…”

Section: Introductionmentioning

confidence: 99%

Nature of Deviations From the Regularities of Three-Particle Recombination in Dense Plasma

Zhovtyansky¹

2022

Problems of Atomic Science and Technology

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An explanation is proposed for the phenomenon of deviations from the functional laws of three-particle recombination in dense electric arc plasma of argon at an initial electron density of ~ 1016 cm-3. Experimental data, which are the basis of the work, were obtained by spectral and probe methods during the study of plasma decay of a microsecond pulse electric arc in argon 6 µs at an initial pressure of 70...700 Pa and a discharge current amplitude of 6 kA. Theoretical estimates show that the reason of the observed effects is the self-absorption of resonant spectral lines of argon, which significantly limits the recombination flow of electrons in the energy structure of atoms.

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Modelling of electromagnetic processes in system ‘welding arc – evaporating anode’ Part 1 – Model of anode region

Cited by 17 publications

References 21 publications

Numerical simulation of arc and droplet transfer in pulsed GMAW of mild steel in argon

Numerical simulation of arc and droplet transfer in pulsed GMAW of mild steel in argon

Synthesis and generalisation of welding fundamentals to design new welding technologies: Status, challenges and a promising approach

Nature of Deviations From the Regularities of Three-Particle Recombination in Dense Plasma

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