超声-MAG复合焊接熔滴过渡受CO_2含量的影响  

Effect of CO_2 content for droplet transfer in ultrasoundMAG hybrid welding

作　　者：范成磊[1] 谢伟峰[1] 杨春利[1] 庄小威[2] 林三宝[1] 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001 [2]中国航天科技集团公司川南机械厂,泸州646000

出　　处：《焊接学报》2015年第3期18-22,2,共6页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51275134)

摘　　要：介绍了一种新型MAG焊熔滴调控的方法,基于前期研究,首次将超声驻波场引入MAG焊.在不同保护气体成分(CO2含量)条件下,探索研究超声对MAG焊熔滴过渡的影响.结合高速摄像拍摄的电弧与熔滴图像,研究了电弧长度以及熔滴导电区域夹角变化,结果表明,低CO2含量条件下超声作用更加明显,但随着CO2含量增加,特别是超过20%时,短路过渡中超声对电弧压缩效果趋于恒定并最低.滴状过渡中阻碍熔滴过渡的电磁力逐渐增强,最终也抵消了超声的促进作用.显示出超声作用效果对CO2含量的选择性.最后利用纯CO2保护的超声-MAG复合焊试验验证了试验的有效性.Since the presence of CO2,the droplet control to MAG welding has always been a difficult problem. Based on preliminary studies,ultrasonic standing wave field,as a new method of droplet regulation,was introduced into MAG welding in this paper. In different conditions of shielding gas composition,the effect of ultrasound on droplet transfer was also studied.Under the conditions of low CO2 content,ultrasonic effect was still very significant. But with the increase of CO2 content,especially more than 20%,in short transition,the compression effect of ultrasound-arc tended to a constant and minimum. In droplet transition,this electromagnetic force gradually increased and eventually offset the downward ultrasound radiation force. Finally,the conclusions of the above analysis was verified by pure CO2ultrasonic-MAG welding experiment.

关 键 词：超声-MAG焊接 CO2含量 电弧压缩率 导电区域夹角 

分 类 号：TG456[金属学及工艺—焊接]