In order to reduce the porosity defects in laser welding of aluminum alloy, a 3D numerical model is presented to study the temperature field and flow field characteristics of the molten pool during laser welding of 5052 aluminum alloy with different scanning shape. The welding with “∞” shaped scanning welding and single welding are calculated based on the numerical simulation model. The results show that the weld pool is more stable due to the low line energy and recoil pressure in the “∞” shaped laser scanning welding compared to the single beam laser welding. With the increase of scanning amplitude and scanning frequency in the “∞” shaped scanning welding, the ratio of depth to width of molten pool decreases. The keyhole also decreases with the increase of scanning amplitude, which can improve the stability of molten pool. In addition, it can be seen that the molten pool can be heated repeatedly in the scanning laser welding, which results in improving the temperature distribution and molten pool stability. Simultaneously, the eddy currents in vertical direction formed in the molten pool under scanning welding condition leads to the bubble reduction in the molten pool and then decrease the porosity in the weld.

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
  • 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
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
Track: Laser Materials Macroprocessing
Session: Process Optimization and Modeling
Day of Week: Monday
Date/Time:
Location:

Keywords

  • Aluminum Alloy
  • Amplitude And Frequency
  • Eddy Current
  • Laser Scanning Welding
  • Porosity