Numerical Simulation of Molten Pool Dynamics in Laser Deep Penetration Welding of Aluminum Alloys

Crystals

Weimin Long¹  Shuai Li²  Hongqiao Xu²  Xingxing Wang²  Jin Peng²  Xiaohong Yang³  Jian Zhang⁴ 

[1] China Innovation Academy of Intelligent Equipment Co., Ltd., Ningbo 315700, China;Henan International Joint Laboratory of High-Efficiency Special Green Welding, Material College, North China University of Water Resources and Electric Power, Zhengzhou 450045, China;Jinhua Polytechnic, Jinhua 321017, China;State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;

关键词: laser welding;    numerical simulation;    welding speed;    molten pool;    keyhole;   

DOI  :  10.3390/cryst12060873

来源: DOAJ

【 摘 要 】

In this paper, the numerical simulation of molten pool dynamics in laser deep penetration welding of aluminum alloys was established based on the FLUENT 19.0 software. The three-dimensional transient behavior of the keyhole and the flow field of molten pool at different welding speeds were analyzed, and the influence of the welding speed on the molten pool of aluminum alloys in laser welding was obtained. The results indicated that the generation of welding spatters was directly related to the fluctuation of the diameter size in the middle of the keyhole. When the diameter in the middle of the keyhole increased by a certain extent, welding spatters occurred. When welding spatters occurred, the diameter in the middle of the keyhole became smaller. In addition, the size of the spatters at the welding speed of 9 m/min was larger than that of the spatters at the welding speeds of 3 m/min and 6 m/min. The welding spatter formed in laser deep penetration welding included: spatter created by an inclined liquid column behind the keyhole; splash created by a vertical liquid column behind the keyhole; small particles splashed in front of the keyhole. With the increase of the welding speed, the tendency of the welding spatter to form in front of the keyhole and to form a vertical liquid column behind the keyhole became weaker. When the welding speed was 9 min, only an obliquely upward liquid column appeared on the molten pool surface behind the keyhole. Compared with the welding speeds of 6 m/min and 9 m/min, the maximum flow velocity fluctuation of the molten pool at the welding speed of 3 m/min was obviously higher.

【 授权许可】

Unknown