驱动力对2219铝合金DLBSW焊接熔池行为的影响  

Effect of driving force on molten pool behavior of 2219 aluminum alloy DLBSW process

作　　者：康悦 赵艳秋[1] 李悦[1] 陈丹[1] 綦娜 占小红[1] KANG Yue;ZHAO Yanqiu;LI Yue;CHEN Dan;QI Na;ZHAN Xiaohong(Nanjing University of Aeronautics and Astronautics College,Nanjing,210000,China)

机构地区：[1]南京航空航天大学,南京210000

出　　处：《焊接学报》2022年第2期82-87,I0007,I0008,共8页Transactions of The China Welding Institution

基　　金：国防科技重点实验室基金(6142005200402)。

摘　　要：为了探索激光焊接熔池驱动力与焊接过程中熔池流动之间的关系,构建2219铝合金T形结构双激光束双侧同步焊接(dual laser-beam bilateral synchronous welding,DLBSW)过程热-流耦合模型.分析表面张力、反冲压力、重力及热浮力对熔池流动的驱动作用,并阐述这些驱动力共同作用下的熔池流动机理.结果表明,熔池表面的流体,其主要受到表面张力的驱动作用;对于熔池下端左侧及后方形成的环流,其主要受到表面张力、热浮力及重力的共同驱动作用;匙孔下方熔池底部在重力及热浮力的共同作用下沿熔池边缘流动.The thermal-fluid coupling model of 2219 aluminum alloy T-type structure with dual laser-beam bilateral synchronous welding(DLBSW) was established to explore the relationship between the driving force of molten pool and flow field during DLBSW process. The driving effects of surface tension, recoil pressure, gravity and thermal buoyancy on molten pool flow field were analyzed, and the mechanism of molten pool flow field under combined influence of driving forces was indicated. The results show that: the flow fluid on the surface of molten pool is mainly driven by surface tension;the circulation formed at the left and back of the bottom of the molten pool are mainly co-driven by surface, gravity and thermal buoyancy;the bottom of molten pool below keyhole flows along the edge of molten pool under co-driven of gravity and thermal buoyancy.

关 键 词：双激光束双侧同步焊接 表面张力 反冲压力 重力 热浮力 

分 类 号：TG456.7[金属学及工艺—焊接]