摘要
采用高速摄像机系统和NI AD数据采集系统研究了小电流MAG焊的熔滴过渡行为和电信号.结果表明,薄钢板小电流MAG焊接熔滴过渡方式以短路过渡为主.短路阶段电压迅速下降,电流快速上升,形成短路液柱;当电流增大到某一值时液桥爆断,熔滴携带热能与动能过渡到熔池中,电弧电压恢复到空载电压,电弧重新引燃;根据短路过渡中燃弧与短路阶段的不同热源特性,开发了小电流短路过渡的新型MAG热源模型;燃弧阶段采用不同功率的双椭圆热源模型,短路阶段采用考虑熔滴热能和动能的均匀体热源模型;通过双椭圆与均匀体热源周期加载描述小电流MAG焊接热输入.同时,研究了不同热输入MAG对熔池几何形貌和熔宽、熔深的影响,以进一步验证所开发的热源模型,计算结果与试验结果吻合较好.
The droplet transfer behavior and electrical signal of low-current MAG welding were studied by a high-speed camera system and an NI AD data acquisition system.The results show that the droplet transfer mode of low-current MAG welding of thin steel plate is mainly short-circuit transfer.In the short-circuit stage,the voltage drops rapidly,and the current rises rapidly,forming a short-circuit liquid column.When the current increases to a certain value,the liquid bridge bursts;the droplets carry heat and kinetic energy to the molten pool,and the arc voltage returns to the no-load voltage;the arc is re-ignited.According to the different heat source characteristics of the arcing and short-circuit stages in the short-circuit transition,a new MAG heat source model for the low-current short-circuit transition is developed.The double elliptical heat source model with different power is used in the arcing stage,and the homogeneous body heat source model,considering the droplet heat energy and kinetic energy,is used in the short-circuit stage.The heat input of low-current MAG welding is described by double elliptical and homogeneous body heat source periodic loading.At the same time,the effects of MAG welding on the geometric morphology,width,and depth of the molten pool under different heat inputs are studied to further verify the developed heat source model.The results show that the calculated are in good agreement with the experimental results.
作者
徐世祥
孙振邦
韩永全
李亚南
刘建平
尚瑞雪
XU Shixiang;SUN Zhenbang;HAN Yongquan;LI Ya'nan;LIU Jianping;SHANG Ruixue(School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot,010051,China;Engineering Research Center of Development and Processing Protection of Advanced Light Metals,Ministry of Education,Hohhot,010051,China;School of Materials Science and Engineering,Inner Mongolia University of Science&Technology,Baotou,014017,China)
出处
《焊接学报》
北大核心
2025年第8期89-96,共8页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(52265054)
内蒙古自治区自然科学基金项目(2022ZD03)
新型有色金属材料开发与加工成形关键技术集成攻关大平台建设项目(RZ2300001971)
内蒙古自治区军民融合重点科研项目(JMZD202302)
一流学科科研专项项目(YLXKZX-NGD-033)
内蒙古工业大学科学研究项目博士基金(BS2021004)。
关键词
薄钢板
小电流MAG
短路过渡
热源模型
thin steel plate
low-current MAG
short-circuit transition
heat source model
