About the influence of a steady magnetic field on weld pool dynamics in partial penetration high power laser beam welding of thick aluminium parts

Bachmann, Markus; Avilov, Vjaceslav; Gumenyuk, Andrey; Rethmeier, Michael

doi:10.1016/j.ijheatmasstransfer.2013.01.015

Cited by 148 publications

(44 citation statements)

References 15 publications

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“…Simulating the weld pool support, the pressure differences between the upper and lower surfaces were analyzed to evaluate the degree of compensation of the hydrostatic pressure. The formula apparatus and simulation details can be found in detail in Bachmann et al (2012), Bachmann et al (2013) and Bachmann et al (2014).…”

Section: Numerical Simulation Of a Weld Pool Support By Oscillating Mmentioning

confidence: 99%

Experimental and Numerical Investigation of an Electromagnetic Weld Pool Control for Laser Beam Welding

et al. 2014

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The objective of this study was to investigate the influence of externally applied magnetic fields on the weld quality in laser beam welding. The optimization of the process parameters was performed using the results of computer simulations. Welding tests were performed with up to 20 kW laser beam power. It was shown that the AC magnet with 3 kW power supply allows for a prevention of the gravity drop-out for full penetration welding of 20 mm thick stainless steel plates. For partial penetration welding it was shown that an 0.5 T DC magnetic field is enough for a suppression of convective flows in the weld pool. Partial penetration welding tests with 4 kW beam power showed that the application of AC magnetic fields can reduce weld porosity by a factor of 10 compared to the reference joints. The weld surface roughness was improved by 50 %.

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Section: Numerical Simulation Of a Weld Pool Support By Oscillating Mmentioning

confidence: 99%

Experimental and Numerical Investigation of an Electromagnetic Weld Pool Control for Laser Beam Welding

et al. 2014

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“…Different from laser welding under the steady magnetic field [17], magnetic field has little effect on the temperature distribution of the molten pool during laser remelting. The heat conduction pays a more significant role than heat convection in the molten pool, in terms of the small Peclet number.…”

Section: Discussionmentioning

confidence: 94%

“…As a result, the weld surface roughness could be reduced by 50% [16]. In particular, a steady magnetic field has been applied in partial penetration high power laser beam welding [17]. The stationary simulation model and experiment were carried out to research the dissipating effect on the weld pool dynamics.…”

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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“… Heat losses by radiation were neglected due to the high relation of volume versus surface of the plate. [20,21].…”

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confidence: 99%

Numerical Simulation on the Origin of Solidification Cracking in Laser Welded Thick-Walled Structures

Bakir

Artinov

Gumenyuk

et al. 2018

Metals

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Abstract:One of the main factors affecting the use of lasers in the industry for welding thick structures is the process accompanying solidification cracks. These cracks mostly occurring along the welding direction in the welding center, and strongly affect the safety of the welded components. In the present study, to obtain a better understanding of the relation between the weld pool geometry, the stress distribution and the solidification cracking, a three-dimensional computational fluid dynamic (CFD) model was combined with a thermo-mechanical model. The CFD model was employed to analyze the flow of the molten metal in the weld pool during the laser beam welding process. The weld pool geometry estimated from the CFD model was used as a heat source in the thermal model to calculate the temperature field and the stress development and distributions. The CFD results showed a bulging region in the middle depth of the weld and two narrowing areas separating the bulging region from the top and bottom surface. The thermo-mechanical simulations showed a concentration of tension stresses, transversally and vertically, directly after the solidification during cooling in the region of the solidification cracking.

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About the influence of a steady magnetic field on weld pool dynamics in partial penetration high power laser beam welding of thick aluminium parts

Cited by 148 publications

References 15 publications

Experimental and Numerical Investigation of an Electromagnetic Weld Pool Control for Laser Beam Welding

Experimental and Numerical Investigation of an Electromagnetic Weld Pool Control for Laser Beam Welding

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

Numerical Simulation on the Origin of Solidification Cracking in Laser Welded Thick-Walled Structures

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