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Heat Source Models in Numerical Simulations of Laser Welding
1Department of Welding Engineering, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland.
Materials (Basel, Switzerland)
|June 14, 2020
Summary
This study enhances laser welding simulations by modifying heat source models for solid-state and high-power diode lasers (HPDL). The improved models offer more accurate predictions of stresses and strains in welded materials.
Area of Science:
- Materials Science
- Mechanical Engineering
- Computational Modeling
Background:
- Laser welding simulations require accurate heat source models.
- Existing models may not fully capture the unique characteristics of different laser types, such as solid-state disc lasers and high-power diode lasers (HPDL).
- Variations in laser beam power distribution and shape necessitate model adjustments for precise simulation outcomes.
Purpose of the Study:
- To propose and validate modified heat source models for numerical simulations of laser welding processes.
- To improve the accuracy of simulations for welding with solid-state disc lasers and high-power diode lasers (HPDL).
- To compare simulation results using standard versus modified heat source models, focusing on stress and plastic strain.
Main Methods:
- Modification of predefined heat source models within VisualWeld (SYSWELD) software.
- Calibration and validation of proposed models using metallographic tests and thermal cycle data from real laser welding processes.
- Comparative analysis of stress and cumulative plastic strain distributions between standard and modified models.
Main Results:
- Successfully developed and validated modified heat source models tailored for specific laser types (solid-state disc lasers, HPDL).
- Demonstrated differences in simulation outcomes, particularly in stress and cumulative plastic strain distributions, when using modified versus standard models.
- The modified models provide a more accurate representation of heat distribution and its impact on material behavior during laser welding.
Conclusions:
- Modified heat source models significantly enhance the accuracy of laser welding simulations.
- The proposed approach allows for more precise prediction of residual stresses and plastic strains, crucial for structural integrity.
- This work provides a valuable tool for optimizing laser welding parameters and process design.
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