基于电弧力调控的CO2气体保护焊熔滴激振技术研究  

Excitation of droplet oscillation in CO_2 shielded welding based on arc force regulating

作　　者：陈树君 曾扬博 肖珺 白立来 贾亚洲 Chen Shujun;Zeng Yangbo;Xiao Jun;Bai Lilai;Jia Yazhou(College of Mechanical Engineering and Applied Electronic Technology,Engineering Research Center of Advanced Manufacturing Technology for Automotive Components,Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学机械工程与应用电子技术学院汽车结构部件先进制造技术教育部工程研究中心,北京100124

出　　处：《焊接》2018年第8期1-5,65,共6页Welding & Joining

摘　　要：基于能量最小原理采用Surface Evolver软件对CO_2气体保护焊熔滴形态进行了数值模拟,分析了不同尺寸的熔滴在不同焊接电流下的稳定熔滴形态,从理论上预测得出了CO_2气体保护焊在由大电流切换到小电流时,熔滴可由排斥状态转变为垂顺状态,甚至可以激发焊丝轴向的熔滴振荡。进而采用脉冲电流波形对此进行了试验验证,结果表明,将电流由峰值切换到基值,可以使熔滴由被托起状态转变为下垂状态,在熔滴较小、脉冲峰值较高且脉宽较小时,熔滴在峰值期间被轴向托起压缩没有径向排斥偏转,切换到基值后熔滴由排斥压缩状态回弹并开始较强烈的熔滴振荡,随着振幅衰减逐渐达到基值电流下的稳定形态。利用这一振荡将有助于实现CO_2气体保护焊稳定轴向自由无飞溅熔滴过渡的控制。Numerical simulation of droplet surface in CO 2 shielded welding was performed based on Surface Evolver software.The droplet profile of different size at different welding current were predicted.The results indicates that the droplet can change from repelled status to pendant status when the current switches from peak to base.During this process,the droplet even can be excited to oscillation.Experiments with pulsed current waveform were conducted to verify these predictions.Results show that the droplet is repelled during the peak duration and changed to vertical pendant profile when the current is changed to base.When the droplet size is properly controlled to be relatively small,the droplet will not be repelled during the peak but only wire-axially compressed.In this case,when the current changes to base,the droplet would be excited to a damping oscillation.This kind of oscillation could be synchronously utilized to enhance the droplet detachment.

关 键 词：CO2气体保护焊 熔滴过渡 电弧力调控 熔滴激振 

分 类 号：TG444.2[金属学及工艺—焊接]