摘要
提出双旁路耦合电弧熔化极惰性气体保护(Dual bypass metal inert-gas,DB-MIG)电弧焊方法并建立试验系统。该方法以传统熔化极惰性气体保护焊接电弧为主弧,引入两路对称的电流可控的非熔化极旁路电弧并与主弧形成耦合电弧进行焊接。由于旁路电弧的分流作用,在保持较高焊丝熔化电流的同时可有效降低母材输入电流,并且旁路电弧力的作用对熔滴过渡也有显著的影响。设计专用的窄带滤光系统,实现无激光背光的焊接熔滴过渡行为的高速摄像,获得不同旁路电流参数条件下的铝合金DB-MIG焊熔滴过渡的高速摄影图像并进行分析。试验结果表明总电流恒定的情况下,熔滴过渡形态随旁路电弧电流参数改变而改变。对DB-MIG焊条件下作用于熔滴上的电弧力的分布进行理论分析,解释试验现象,理论分析和研究表明双旁路耦合电弧可以促进熔滴过渡并可显著降低喷射过渡的临界电流。
The dual bypass metal inert gas（DB-MIG） arc welding method is presented and an experimental system is established.In this method,a conventional MIG welding arc is used as main arc and two symmetrical TIG welding arcs with controllable current are introduced as bypass arc.A coupled arc is formed by main and bypass arcs to carry out welding.Due to the shunt effect of bypass arc,base metal input current can be decreased effectively while wire melting current keeps high,and bypass arc force has great influence on metal transfer.A special narrow-band-filter system is built to realize high speed video of metal transfer behaviors without laser backlight,and high speed photographic images under different bypass current parameter conditions are obtained.Analysis results show that metal transfer mode changes with the change of current parameters of bypass arc.Then the changes in the forces acting on the droplet and the effects of these changes on the metal transfer behaviors are analyzed and the experimental phenomena are explained.Analysis shows that the bypass arcs and currents lower the critical current needed to achieve the desired spray transfer
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2010年第20期76-79,85,共5页
Journal of Mechanical Engineering
基金
国家自然科学基金(50805073)、国家自然科学基金国际合作(50710105060)
兰州理工大学优秀青年教师培养计划(Q200901)资助项目
