Abstract
The present study focuses on modelling numerous aspects of the welding process which include predictions of molten metal convection in the weld pool, size and shape of the fusion zone (FZ) and heat-affected zone (HAZ), temperature distributions in the FZ and HAZ, solidification conditions of the FZ, and phase transformation kinetics in the HAZ. Integrated models were developed taking into account the interactions of heat, fluid flow and microstructure. In particular, a three-dimensional heat transfer and fluid flow model was used to understand the weld pool phenomena and provided useful insight into the physics of the weld pool. Application of the computed thermal cycles and phase transformation models including Johnson-Mehl-Avrami equation and Monte Carlo simulation provided useful tools to understand the microstructural evolution during welding. The developed models were used to investigate several welding processes such as gas metal arc welding (GMAW) and gas tungsten welding (GTAW) and different materials including AISI 1005 low carbon steel, 1045 mild carbon steel, Ti-6AI-4V alloy and 2025 duplex stainless steel. This paper is an extensive summary of the doctoral research work carried out by the author at the Pennsylvania State University.
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This research work was supervised by Prof. Tarasankar DebRoy of the Pennsylvania State University, University Park, Pennsylvania, USA, and Dr. John W. Elmer of Lawrence Livermore National Laboratory, Livermore, California, USA.
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Zhang, W. Henry Granjon Prize Competition 2006 Co-Winner, Category A “Joining and fabrication technology” Numerical Modelling of Heat Transfer, Fluid Flow and Microstructural Evolution during Fusion Welding of Alloys. Weld World 50, 12–22 (2006). https://doi.org/10.1007/BF03263441
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DOI: https://doi.org/10.1007/BF03263441
IIW-Thesaurus keywords
- Simulating
- Heat flow
- Microstructure
- Prediction
- Fusion welding
- Fusion zone
- Weld zone
- Heat affected zone
- GMA welding
- Arc welding
- Gas shielded arc welding
- GTA welding
- Temperature distribution
- Solidification
- Transformation
- Thermal cycling
- Practical investigations
- Comparisons
- Low carbon steels
- Steels
- Unalloyed steels
- Duplex stainless steels
- Stainless steels
- Titanium alloys
- Reference lists