|About this Abstract
||Materials Science & Technology 2019
||Joining of Advanced and Specialty Materials XXI
||Theoretical Analysis of Keyhole Dynamics Based on Calculation of Coupled Multiphase Transfer during Laser Beam Welding for Aluminum
||Hiroaki Mori, Qiaofeng Zhou, Fumikazu Miyasaka
|On-Site Speaker (Planned)
In order to clarify the mechanism of porosity formation during Laser beam welding (LBW) process, the fluid dynamics and molten pools were modeled using an original coupled phase transfer method and an adaptive heat source model was proposed for the absorption of laser beams into the molten metal. As using the developed calculation code, factors considered in the simulations include buoyancy force, Marangoni force and recoil pressure; furthermore, the models can also lead to the phenomenon of keyhole collapse. Models to calculate the shear stress on the keyhole surface and of the heat transfer into the molten pool via a plasma plume are introduced. As compared with the calculated bubbles’ formation and in-situ observation of bubble formed during LBW, the calculation was in good agreement with experimental results. Therefore, it suggested that the developed simulation method can be useful technique to predict the formation of porosity during LBW.