铝合金Plasma-GMAW-P复合焊接电弧特性及熔滴过渡行为  

Arc Characteristic and Droplet Transfer Behavior in Plasma-GMAW-P Hybrid Welding

作　　者：韩蛟 韩永全[1] 洪海涛[1] 王学龙 Han Jiao;Han Yongquan;Hong Haitao;Wang Xuelong(Key Laboratory of Material Forming,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学材料成型重点实验室,内蒙古呼和浩特010051

出　　处：《稀有金属材料与工程》2022年第6期2027-2032,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51665044);Science and Technology Programs of Inner Mongolia(2020GG0313);Natural Science Foundation of Inner Mongolia(2019LH05017);Foundation of Inner Mongolia University of Technology(ZZ201806)。

摘　　要：研究了Plasma-GMAW复合焊接过程中的电弧特性以及熔滴过渡行为。结果表明,不同电流的等离子弧通过改变GMAW电弧的导电以及受力状态来影响GMAW电弧形态以及熔滴过渡行为。等离子弧电流较小时,GMAW电弧的等离子流效应对GMAW电弧形态影响显著,基值时期的GMAW电弧基本沿焊丝轴线燃弧,峰值时期由于在焊接方向上同时受到方向相反的2个力而被压缩,熔滴所受的等离子流力以及等离子流力垂直向下的分力因此增加,对熔滴过渡的促进作用增强,熔滴更易从焊丝脱落。等离子弧电流增加,氛围中金属蒸气增多,电荷流效应对GMAW电弧的影响增强,基值时期GMAW电弧偏向等离子弧方向燃弧,由于焊接电弧存在热惯性,MIG电弧在峰值时仍偏向等离子弧,熔滴所受等离子流力垂直向下的分力因此减小,熔滴脱离焊丝的时间增加。The arc characteristics and droplet transfer behavior in plasma-GMAW-P hybrid welding were investigated.The effect of plasma arc current on GMAW-P arc shape and metal transfer was discussed.The results indicate that the plasma arc will change the electrical conductivity and stress state of GMAW arc to affect the morphology of GMAW arc and droplet transfer behavior.When the plasma arc current is small,the GMAW arc in the base current period basically burns along the wire axis,and the bell-shaped GMAW arc in the peak current period is compressed due to two opposite forces(the electromagnetic force generated by the plasma arc and the wire)in the welding direction.At this time,the drag force of plasma flow and its downward component increase,the droplet transition is promoted,and the detached time of droplet is shortened.When the plasma arc current reaches a certain value,the metal vapor in the atmosphere near the plasma arc increases,and the conductive path of the GMAW arc will be changed to bias the GMAW arc to the plasma arc.At this time,the downward component of the drag force of the plasma flow on the droplet decreases,the promotion of the droplet transition is weakened,and the detached time of droplet is increased.

关 键 词：电弧特性 熔滴过渡 复合焊接 Plasma-GMAW-P 

分 类 号：TG457.14[金属学及工艺—焊接]