铝合金等离子-MIG复合焊接电弧行为  

Arc behavior of plasma-MIG hybrid welding of aluminum alloy

作　　者：韩蛟 韩永全[1] 洪海涛[1] 王学龙 HAN Jiao;HAN Yongquan;HONG Haitao;WANG Xuelong(Inner Mongolia University of Technology,Engineering Research Center of Development and Processing Protection of Advanced Light Metal materials of the Ministry of Education,Hohhot,010051,China)

机构地区：[1]内蒙古工业大学,教育部先进轻金属材料开发与加工防护工程研究中心,呼和浩特010051

出　　处：《焊接学报》2022年第2期45-49,I0005,共6页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51665044);内蒙古自治区科技厅项目(2020GG0313);内蒙古自然科学基金项目(2019LH05017)。

摘　　要：试验发现铝合金等离子-MIG复合焊中,等离子弧焊接电流为130 A,MIG焊接电流为180 A(基值电流95 A)时,基值时期的MIG电弧在等离子弧附近燃弧阻抗小,复合焊中MIG电弧电压在脉冲基值时期低于单独MIG焊,电荷流效应使MIG电弧在基值时期偏向等离子弧,偏向等离子弧方向的MIG电弧主要电离介质为氩气.当MIG焊接电流增加到240 A(基值电流122 A)后,以上现象消失.由于焊接电弧存在热惯性,当MIG电弧在基值时期偏向等离子弧时,在脉冲电流上升阶段,以及电流刚达到峰值时,MIG电弧仍会偏向等离子弧,此阶段复合焊中MIG电弧电压高于单独MIG焊.当复合焊中存在MIG电弧偏向等离子弧燃弧的现象时,MIG电弧稳定性有所下降,随着MIG焊接电流的增加,电弧稳定性增加.It is found that in the plasma-MIG hybrid welding of aluminum alloy, when the plasma arc welding current is 130A and the MIG welding current is 180A(base current is 95A),the resistance of MIG arc near the plasma arc in the base current time is small, and the voltage of MIG arc in the hybrid welding is lower than that in the single MIG welding in the pulse base period, and the main ionization medium of the MIG arc biased towards the plasma arc is Ar. When the MIG welding current increases to 240A(base current is 122A), the above phenomenon disappears. Due to the thermal inertia of the welding arc, when the MIG arc is biased towards the plasma arc in the base current period, the MIG arc will still be biased towards the plasma arc in the pulse current rising stage and when the current has just reached the peak current, the MIG arc voltage in the hybrid welding is higher than that in the single MIG welding. When the MIG arc is biased towards plasma arc in hybrid welding, the stability of MIG arc decreases. With the increase of MIG welding current, the arc stability increases.

关 键 词：复合焊接 等离子-MIG复合焊接 电弧行为 特征粒子 

分 类 号：TG403[金属学及工艺—焊接]