Simulation between Soldering and Brazing of Copper at 450 Temperature by Zn-Sn Fillet Alloy

Kahlol, Kadhim K.; Aldhaidhawi, Mohanad; Nawi, Sami A.

doi:10.1088/1757-899x/1076/1/012074

Cited by 2 publications

(1 citation statement)

References 1 publication

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“…On the one hand there are assemblies with thin or greatly varying material thicknesses [1,2]. In additon to this, different materials are frequently used, so that significant stresses are induced in the brazed part during cooling due to differing coefficients of thermal expansion [3][4][5]. Examples of this are cemented/carbide-steel-and ceramic/steel-joints, in which cracks occur in the cemented carbide or in the ceramic when stress conditions are too high, despite the often small joining surfaces [3,4,[6][7][8].…”

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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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

View full text Add to dashboard Cite

show abstract

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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Simulation between Soldering and Brazing of Copper at 450 Temperature by Zn-Sn Fillet Alloy

Cited by 2 publications

References 1 publication

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

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

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