Thermal modelling of a brazing process of vacuum interrupters

Aranaga, S.; Izcara, Jesús; Río, Laura del; Vallejo, Haritz; Seco, Miguel

doi:10.1109/deiv.2016.7763943

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…We decided to describe the brazing process with the parameters and aspects vital for its industrial application. Modeling activities are processed by defining the following inputs [7][8][9][10][11][12][13][14]:…”

Section: Descriptionmentioning

confidence: 99%

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Electromagnetic Modeling and Thermal Analysis of a Non-Axisymmetric System for Induction Brazing

2020

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The electromagnetic process happening between an induction brazing coil and the brazing assembly was studied and is described in the following pages. Using the tools of numerical analysis, we managed to achieve 3-D simulation of the process, which includes presentation of the magnetic field, thermal heat transfer, and time dependence. The results presented are considered for two of commonly used materials—copper and stainless steel in the shape of pipes. The induction brazing coil is a complex C-shape to match with the real industrial practices. The results obtained from the model are in accordance with the experimental results, as in both the model and the experiment, the required temperature was reached in about 6 s. It was found that during the brazing process, the inductance of the winding increases by about 4 nH and the resistance by 1.5 mΩ, which is important for the coordination of the power supply.

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Section: Descriptionmentioning

confidence: 99%

“…Because of the water cooling, the increase of R1 with time is relatively weak. The behavior of ∆R is more complicated (12). At R 2 = 0 and R 2 = ∞, its value is zero.…”

Section: Coil Analysismentioning

confidence: 99%

Electromagnetic Modeling and Thermal Analysis of a Non-Axisymmetric System for Induction Brazing

2020

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“…All these examples illustrate the extraordinarily high demands on the control of component distortion in vacuum brazing processes which require a lot of experience. The situation is further complicated by a wide range of influencing variables for distortion, large industrial batches of different components and, in particular, the fact that component distortion cannot be determined during the process [16,17]. From a brazing point of view, component deformation primarily leads to a widening of the joint gap, so that a depletion of the applied filler metal occures and results in the formation of large cavities in the joint.…”

Section: Introductionmentioning

confidence: 99%

Finite element modeling and simulation of vacuum brazing processes with a focus on cycle-dependent component distortion

Tillmann¹,

Henning

Wojarski³

et al. 2023

Preprint

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For the production of high-strength connections by brazing, it is very important to control component distortion and the gap size that depends on it. In particular, nickel-based filler metals will form brittle phases at larger gaps which extraordinarily reduce the joint strength. Thus, a model using fi nite element analysis was developed in Ansys Workbench to calculate the cycle-dependent component deformation of brazing assemblies during the joining process. At first, this cpaper describes the most important aspects to consider when simulating thermal radiation in a vacuum furnace from a constructive point of view. Furthermore, a new model strategy is shown which keeps the calculation times moderate by a clever choice of supports and boundary conditions. It could be shown that the component deformation during heating can be easily kept in the elastic range and can be almost completely eliminated by using a geometry-dependent soaking time. In contrast, high cooling rates were shown to result in thermally induced stresses well above the elastic yield limit, causing signifi cant component deformation. With further cooling, the deformation decreases signifi cantly, but it depends on the initial stress, the geometry and the cooling rate if the deformation can be completely leveled out during the shrinkage of the component. In addition, it was shown that the distortion of the component is highly aff ected by the local position in the heating chamber. As a result of the analyses, the simulation results were used to design a fi xture for vertical positioning which signifi cantly reduced the distortion of the brazed component.

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Finite element modeling and simulation of vacuum brazing processes with a focus on cycle-dependent component distortion

Tillmann

Henning

Wojarski

et al. 2023

Int J Adv Manuf Technol

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Vacuum brazing is a black box process, so component distortion that occurs during the heat treatment is difficult to prove experimentally. Thus, a novel FE-model was developed in ANSYS Workbench to calculate the time and location resolved component deformation of AISI 316L/B-Ni2 brazing assemblies. In this regard, a new method of radiation and contact modeling was developed that enabled a significant reduction of the calculation times and solved the convergence issue for simulating the distortion of large-scale, thin components. The results showed that the component deformation during heating can be easily kept in the elastic range and can be almost completely eliminated by using a geometry-dependent soaking time. In contrast to this, high cooling rates were found to result in thermally induced stresses well above the elastic yield limit, causing significant component deformation. With further cooling, the deformation decreases significantly, but it depends on the initial stress state, the geometry, and the cooling rate whether the deformation can be completely leveled out during the shrinkage of the component. Thus, the initially high cooling rates were identified to be responsible for the final distortion. Furthermore, this was highly affected by the local position in the heating chamber. The simulation results were used to design a fixture for vertical positioning, which reduced the max. temperature difference in the brazing assembly from 141 to 79 °C, the max. interim distortion from 275 to 31 µm, and the final distortion from 14 to 8 µm.

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Thermal modelling of a brazing process of vacuum interrupters

Cited by 4 publications

References 1 publication

Electromagnetic Modeling and Thermal Analysis of a Non-Axisymmetric System for Induction Brazing

Electromagnetic Modeling and Thermal Analysis of a Non-Axisymmetric System for Induction Brazing

Finite element modeling and simulation of vacuum brazing processes with a focus on cycle-dependent component distortion

Finite element modeling and simulation of vacuum brazing processes with a focus on cycle-dependent component distortion

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