Numerical Simulation of Droplet Filling Mode on Molten Pool and Keyhole during Double-Sided Laser Beam Welding of T-Joints
Jin Peng,
Jigao Liu,
Xiaohong Yang,
Jianya Ge,
Peng Han,
Xingxing Wang,
Shuai Li,
Zhibin Yang
Affiliations
Jin Peng
International Joint Laboratory of High-Efficiency Special Green Welding, Material College, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
Jigao Liu
International Joint Laboratory of High-Efficiency Special Green Welding, Material College, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
Xiaohong Yang
School of Mechanical and Electrical Engineering, Jinhua Polytechnic, Jinhua 321017, China
Jianya Ge
School of Mechanical and Electrical Engineering, Jinhua Polytechnic, Jinhua 321017, China
Peng Han
International Joint Laboratory of High-Efficiency Special Green Welding, Material College, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
Xingxing Wang
International Joint Laboratory of High-Efficiency Special Green Welding, Material College, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
Shuai Li
International Joint Laboratory of High-Efficiency Special Green Welding, Material College, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
Zhibin Yang
School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China
The effects of droplets filling the molten pools during the double-sided laser beam welding (DSLBW) of T-joints was established. The dynamic behavior of the keyhole and the molten pool under different droplet filling modes were analyzed. The results indicated that compared with the contact transition, the stability of metal flow on the keyhole wall was reduced by free transition and slight contact transition. At the later stage of the droplet entering the molten pool via free transition, slight contact transition, and contact transition, the maximum flow velocity of the keyhole wall was 5.33 m/s, 4.57 m/s, and 2.99 m/s, respectively. When the filling mode was free transition or slight contact transition, the keyhole collapsed at the later stage of the droplet entering the molten pool. However, when the filling mode was contact transition, the middle-upper part of the interconnected keyholes became thinner at the later stage of the droplet entering the molten pool. At the later stage of the droplet entering the molten pool via free transition, the flow vortex at the bottom of the keyhole disappeared and the melt at the bottom of the keyhole flowed to the rear of the molten pool, however, the vortex remained during slight contact transition and contact transition.
