Abstract
Numerical simulations make the improvement of fabrication process and welding technology. Numerical simulations make the improvement of fabrication process and welding technology possible. Using finite element method the most important information about welded specimens can be determined such as deformed shape, residual stresses or even microstructural properties like phase proportions or hardness. The current study focuses on the modelling background of welding processes and the effects of different welding parameters on residual stresses and deformations. The paper focuses on heat sources, temperature dependent material properties and the development of a thermo-mechanical analysis. The virtually fabricated specimens are further analysed to investigate the stability behaviour.
Highlights
It is a fundamental expectation to speed up manufacturing processes while improving productivity and quality of steel structures
The current study focuses on the modelling background of welding processes and the effects of different welding parameters on residual stresses and deformations
In case of steel structures there are often manufacturing difficulties and resistance problems due to large weld sizes and high heat inputs. These effects can result in large deformations and residual stresses, which can reduce the resistance of the steel members for example for bridges where the applied plate thicknesses can be quite large
Summary
It is a fundamental expectation to speed up manufacturing processes while improving productivity and quality of steel structures. In case of steel structures there are often manufacturing difficulties and resistance problems due to large weld sizes and high heat inputs These effects can result in large deformations and residual stresses, which can reduce the resistance of the steel members for example for bridges where the applied plate thicknesses can be quite large (up to 100 mm). After the numerical simulation the deformed shape and the residual stress state of the specimen is determined and the virtually fabricated structure is ready for further analyses such as buckling or fatigue analysis. For arc and laser welding the uncoupled analysis technique gives appropriate results It means that in the developed numerical model the temperature fields are determined first during welding while in the mechanical analysis the temperature fields are applied as nodal loads.
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