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1
Content available Numerical Model of Large-Scale Levitation Melting Process
Golak S., Panic B.
Archives of Metallurgy and Materials
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2019
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Vol. 64, iss. 2
627--632
EN
The levitation melting has a potentially wide range of applications, especially in the processing of reactive metals whose contact with the crucible material causes their contamination and damage to the crucible itself. Despite its advantages, levitation melting, already proposed in the 1920s, has not yet found significant use in industrial conditions. This is due to the nature of the electromagnetic field used in previously developed devices. The disappearance of this field in the system axis causes overcoming, in the case of larger charges, surface tension forces and metal leakage from the device. The article contains a comparative analysis of a conventional solution and a newly developed levitation melting device, whose completely different design eliminates the previous weight limit of the charge.
2
Content available remote Experimental validation of electromagnetic-thermal coupled modelling of levitation melting
Hectors D., Van Reusel K., Driesen J.
Przegląd Elektrotechniczny
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2008
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R. 84, nr 11
140-143
EN
This paper verifies whether levitation melting can be modelled in a reliable way using commercial finite element software. An inductor without and with load is studied. Two different levitated materials are treated. Results from simulations are compared with measurement results.
PL
W pracy sprawdzono, czy topienie lewitacyjne może być zamodelowane w niezawodny sposób przy użyciu oprogramowania komercyjnego wykorzystującego metodę elementów skończonych. Przeanalizowano przypadek wzbudnika z obciążeniem i bez obciążenia. Jako wsadu użyto dwóch różnych materiałów Wyniki symulacji porównano z pomiarami.
3
Content available remote The kinetics of nitrogen dissolution in levitation and arc-melted Fe-C-Mn filler metals
Gruszczyk A.
Journal of Achievements in Materials and Manufacturing Engineering
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2008
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Vol. 26, nr 2
115-122
EN
Purpose: The influence of melting method on the kinetics of nitrogen absorption by Fe-C-Mn filler metals has been analysed. The industrial heats of the Fe-C-Mn (SpG1) type welding filler metals were selected for own researches. Design/methodology/approach: The research of the nitrogen absorption kinetics was carried out in the levitation and TIG arc-melting conditions in the Ar+N2 atmosphere. The conditions of experiments were made possibly close to those existing in a molten metal drop in the welding processes. Findings: Based on the models of nitrogen absorption during levitation and arc melting of Fe-C-Mn filler metals, the time-dependent changes of nitrogen content were determined as well as the mass transfer coefficients b and the rates of nitrogen absorption. Nitrogen absorption rate decreases along with the increase of oxygen content in the Fe-C-Mn filler metals arc-melted in the Ar+N2 atmosphere. Research limitations/implications: Investigation of the Fe-C-Mn complex alloys with the specified amount of impurities makes the detailed analysis of the elementary stages of nitrogen dissolution more difficult, yet brings the experiment conditions closer to those occurring in the actual welding processes. Practical implications: Recognizing the mechanisms of nitrogen absorption under arc and non-arc melting to make possible the control of nitrogen level in the welds. Originality/value: Obtained results explain the influence of oxygen and melting conditions on kinetics of nitrogen dissolution in Fe-C-Mn alloys.
4
Content available remote The kinetics of nitrogen dissolution in levitation and arc-melted Fe-C-Mn filler metals
Gruszczyk A.
Archives of Materials Science and Engineering
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2008
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Vol. 31, nr 2
109-112
EN
Purpose: The influence of melting method on the kinetics of nitrogen absorption by Fe-C-Mn filler metals has been analysed. The industrial heats of the Fe-C-Mn (SpG1) type welding filler metals were selected for own researches. Design/methodology/approach: The research of the nitrogen absorption kinetics was carried out in the levitation and TIG arc-melting conditions in the Ar+N₂ atmosphere. The conditions of experiments were made possibly close to those existing in a molten metal drop in the welding processes. Findings: Based on the models of nitrogen absorption during levitation and arc melting of Fe-C-Mn filler metals, the time-dependent changes of nitrogen content were determined as well as the mass transfer coefficients b and the rates of nitrogen absorption. Nitrogen absorption rate decreases along with the increase of oxygen content in the Fe-C-Mn filler metals arc-melted in the Ar+N₂ atmosphere. Research limitations/implications: Investigation of the Fe-C-Mn complex alloys with the specified amount of impurities makes the detailed analysis of the elementary stages of nitrogen dissolution more difficult, yet brings the experiment conditions closer to those occurring in the actual welding processes. Practical implications: Recognizing the mechanisms of nitrogen absorption under arc and non-arc melting to make possible the control of nitrogen level in the welds. Originality/value: Obtained results explain the influence of oxygen and melting conditions on kinetics of nitrogen dissolution in Fe-C-Mn alloys.
5
Content available remote Computer simulation of free boundary in process of levitation induction melting
Dolezel I., Mach M.
Przegląd Elektrotechniczny
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2006
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R. 82, nr 12
69-71
EN
The paper deals with computer modeling of selected processes accompanying levitation melting that is controlled by electromagnetic field. Particular attention is paid to the free boundary of melt whose shape follows from the balance of all forces acting on its surface. The paper presents the mathematical and computer models of the problem and algorithm of its solution. The theoretical analysis is illustrated on a typical example whose results are discussed.
PL
W artykule przedstawiono modelowanie komputerowe wybranych procesów towarzyszących topieniu lewitacyjnemu, sterowanej polem elektromagnetycznym. Szczególną uwagę zwrócono na swobodne brzegi płynnego stopu, które kształtuje równowaga sił działających na jego powierzchni. Zademonstrowano model matematyczny i model komputerowy oraz algorytm jego rozwiązania. Analiza teoretyczna została zilustrowana typowym przykładem obliczeniowym.
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