双丝脉冲MIG电弧与熔池传热传质数值模拟  

Numerical Simulation of Heat and Mass Transfer between Double-Wire Pulsed MIG Arc and Molten Pool

作　　者：申孟伟 陈毅腾 梁志敏[1,2] 饶宇中 闫德俊 SHEN Mengwei;CHEN Yiteng;LIANG Zhimin;RAO Yuzhong;YAN Dejun(School of Material Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships,CSSC Huangpu Wenchong Shipbuilding Company Limited,Guangzhou 510715,China;Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships,Foshan University,Foshan 528051,China)

机构地区：[1]河北科技大学材料科学与工程学院,河北石家庄050018 [2]中船黄埔文冲船舶有限公司广东省舰船先进焊接技术重点实验室,广东广州510715 [3]佛山大学广东省舰船先进焊接技术重点实验室,广东佛山528051

出　　处：《电焊机》2024年第12期49-55,共7页Electric Welding Machine

基　　金：广东省舰船先进焊接技术企业重点实验室基金(2023B1212070026)。

摘　　要：分别建立了双丝脉冲MIG的电弧模型和熔滴-熔池耦合模型,并考虑焊丝之间的相互作用,定量分析了双丝脉冲MIG焊接过程中的电弧物理行为和熔池的传热传质,揭示双丝焊接过程中的熔化和传热传质机理。结果表明,双丝脉冲MIG的电弧等离子体之间存在的电磁力使电弧偏转,并向两焊丝之间集中,从而增加对熔池的搅拌作用;前后两焊丝形成的热源可增加熔深和熔宽,且熔滴交替滴落的方式有利于熔池稳定;熔滴在过渡至熔池表面时,由于表面张力和重力的作用,其速度会突增,对熔池造成更强烈的冲击效应;熔池前端的流动性大于熔池后端,熔滴过渡对熔池流动的影响最为显著,其次是表面张力的影响。A dual-wire pulsed MIG arc model and a droplet-molten pool coupling model were established,taking into ac‐count the interaction between the welding wires.The physical behavior of the arc and the heat and mass transfer of the mol‐ten pool during the dual-wire pulsed MIG welding process were quantitatively analyzed,revealing the melting and heat and mass transfer mechanisms in the dual-wire welding process.The results show that the electromagnetic force existing be‐tween the plasma arcs of the dual-wire pulsed MIG causes the arc to deflect and concentrate between the two welding wires,thereby increasing the stirring effect on the molten pool.The heat sources formed by the front and rear welding wires can in‐crease the depth and width of the melt,and the alternating droplet falling method is conducive to the stability of the molten pool.When the droplets transition to the surface of the molten pool,their speed will surge due to the effects of surface ten‐sion and gravity,causing a more intense impact effect on the molten pool.The fluidity at the front end of the molten pool is greater than that at the rear end,and the influence of droplet transition on the flow of the molten pool is the most significant,followed by the influence of surface tension.

关 键 词：双丝焊 电弧 熔滴过渡 传热传质 流场 

分 类 号：TG402[金属学及工艺—焊接] TG403