Description

The mechanical performance of the welded joints is highly related to the microstructure in the weld in the aluminum alloy laser welding. A two-dimensional phase field model is proposed to investigate the dendrite formation process during the solidification in the 2A14 aluminum alloy laser welding. In the model, the temperature gradient, cooling rate and undercooling are coupling taken into account. Based on the two-dimensional phase field model, the solidification behavior and evolution of solidification microstructure in the welding pool are calculated and quantitatively predicted. The simulated results are compared with the literature and experimental results, which shows good agreement. The influence of temperature gradient, cooling rate and undercooling on the dendrite growth and microstructure has been analyzed in details and all of them play a major role in microstructure in weld, which will further has great effect on the welded joints quality. It is clearly seen that the proposed phase field model is effective for reducing the internal welding structure defects and selecting optimal welding process of desired weld with excellent microstructure and performance. Through the numerical simulation method for microstructure analysis, it can reduce the time and material consumption substantially in practical production and improve the welded joints quality.

Contributing Authors

  • Yuewei Ai
    Key Laboratory of Traffic Safety on Track, Central South University, Ministry of Education, China; School of Traffic & Transportation Engineering, Central South University, China
  • Yi Huang
    Key Laboratory of Traffic Safety on Track, Central South University, Ministry of Education, China; School of Traffic & Transportation Engineering, Central South University, China
  • Long Yu
    Key Laboratory of Traffic Safety on Track, Central South University, Ministry of Education, China; School of Traffic & Transportation Engineering, Central South University, China
  • Xiaoying Liu
    Key Laboratory of Traffic Safety on Track, Central South University, Ministry of Education, China; School of Traffic & Transportation Engineering, Central South University, China
Yi Huang
Key Laboratory of Traffic Safety on Track, Central South University, Ministry of Education, China; School of Traffic & Transportation Engineering, Central South University, China
Track: Laser Materials Macroprocessing
Session: On-demand Only
Date/Time:
Location:

Keywords

  • Dendrite Growth
  • Numerical Simulation
  • Phase Field Model
  • Solidification Behavior
  • Welding Structure Defects