Numerical investigations of Lorentz force influenced Marangoni convection relevant to aluminum surface alloying

Velde, O.; Gritzki, Ralf; Grundmann, R.

doi:10.1016/s0017-9310(00)00299-4

Cited by 28 publications

(9 citation statements)

References 9 publications

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“…The present investigation deals with the numerical calculation and experimental validation of the electromagnetic weld support system for 20 mm stainless steel AISI 304. Representative simulation studies of a fluid flow simulation coupled with an electromagnetic processing are presented in [12][13][14]. Experimental setup.…”

Section: Abstract : Laser Welding High Power Austenitic Staimentioning

confidence: 99%

High-power laser welding of austenitic stainless steel with electromagnetic control of weld pool

Bachmann¹,

Avilov²,

Gumenyuk³

et al. 2014

The Paton Welding J.

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Section: Abstract : Laser Welding High Power Austenitic Staimentioning

confidence: 99%

High-power laser welding of austenitic stainless steel with electromagnetic control of weld pool

Bachmann¹,

Avilov²,

Gumenyuk³

et al. 2014

The Paton Welding J.

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“…Reviews on the use of magnetohydrodynamics in materials processing are given in [14,15]. Especially the Hartmann effect was also used in crystal growth [16], surface alloying [17] and continuous casting [18] reporting a distinct flow deceleration and a reduction of turbulence levels.…”

Section: Introductionmentioning

confidence: 99%

Numerical assessment and experimental verification of the influence of the Hartmann effect in laser beam welding processes by steady magnetic fields

Bachmann

Avilov

Gumenyuk

et al. 2016

International Journal of Thermal Sciences

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Controlling the dynamics in the weld pool is a highly demanding challenge in deep-penetration laser beam welding with modern high power laser systems in the multi kilowatt range. An approach to insert braking forces in the melt which is successfully used in large-scaled industrial applications like casting is the so-called Hartmann effect due to externally applied magnetic fields. Therefore, this study deals with its adaptation to a laser beam welding process of much smaller geometric and time scale. In this paper, the contactless mitigation of fluid dynamic processes in the melt by steady magnetic fields was investigated by numerical simulation for partial penetration welding of aluminium. Three-dimensional heat transfer, fluid dynamics including phase transition and electromagnetic field partial differential equations were solved based on temperature-dependent material properties up to evaporation temperature for two different penetration depths of the laser beam. The Marangoni convection in the surface region of the weld pool and the natural convection due to the gravitational forces were identified as main driving forces in the weld pool. Furthermore, the latent heat of solid-liquid phase transition was taken into account and the solidification was modelled by the Carman-Kozeny equation for porous medium morphology. The results show that a characteristic change of the flow pattern in the melt can be achieved by the applied steady magnetic fields depending on the ratio of magnetic induced and viscous drag. Consequently, the weld bead geometry was significantly influenced by the developing Lorentz forces. Welding experiments with a 16 kW disc laser with an applied magnetic flux density of around 500 mT support the numerical results by showing a dissipating effect on the weld pool dynamics.

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“…Braking of the flow velocities in the weld pool was observed; the evolutions of spatter and melt ejections were reduced. Another research of steady magnetic field was on the laser alloying using numerical investigation method [18]. With the influence of steady magnetic field, the system of vortices was suppressed and the solute was concentrated in the shallower alloying layer.…”

Section: Introductionmentioning

confidence: 99%

Suppression effect of a steady magnetic field on molten pool during laser remelting

Wang

Yao

et al. 2015

Applied Surface Science

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Numerical investigations of Lorentz force influenced Marangoni convection relevant to aluminum surface alloying

Cited by 28 publications

References 9 publications

High-power laser welding of austenitic stainless steel with electromagnetic control of weld pool

High-power laser welding of austenitic stainless steel with electromagnetic control of weld pool

Numerical assessment and experimental verification of the influence of the Hartmann effect in laser beam welding processes by steady magnetic fields

Suppression effect of a steady magnetic field on molten pool during laser remelting

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