Effect of He-Ar shielding gas composition on the arc physical properties of laser-arc hybrid fillet welding:numerical modeling  

作　　者：Yaowei Wang Wen Liu Peng Chen Wenyong Zhao Guoxiang Xu Qingxian Hu 

机构地区：[1]School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China

出　　处：《China Welding》2025年第1期28-38,共11页中国焊接(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant No.52375340,51975263,52405366).

摘　　要：A three-dimensional numerical model of laser-arc hybrid plasma for aluminum alloy fillet joints is developed in this study.This mod-el accounts for the geometric complexity of fillet joints,the physical properties of shielding gases with varying He-Ar ratios,and the coupling between arc plasma and laser-induced metal plume.The accuracy of the model is validated using a high-speed camera.The effects of varying He contents in the shielding gas on both the temperature and flow velocity of hybrid plasma,as well as the distribu-tion of laser-induced metal vapor mass,were investigated separately.The maximum temperature and size of arc plasma decrease as the He volume ratio increases,the arc distribution becomes more concentrated,and its flow velocity initially decreases and then sharply increases.At high helium content,both the flow velocity of hybrid plasma and metal vapor are high,the metal vapor is con-centrated on the right side of keyhole,and its flow appears chaotic.The flow state of arc plasma is most stable when the shielding gas consists of 50%He+50%Ar.

关 键 词：He-Ar shielding gas components Laser-arc hybrid welding Plasma physical properties Numerical model Aluminum alloy fillet welding 

分 类 号：TG456.7[金属学及工艺—焊接]