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中文摘要：
双丝旁路耦合电弧GMAW是一种新型高效的焊接方法,在实现高熔敷率的同时,可以显著降低母材的热输入.采用被动式视觉传感的方法对双丝旁路耦合电弧GMAW焊接熔滴过渡的行为进行高速摄像采集,获得不同形式下的熔滴过渡过程并进行对比分析.结果表明：当保护气体为纯氩气时,旁路熔滴尺寸较大且难以向熔池过渡;当保护气体为φ（Ar）=80%和φ（CO2）=20%的混合气体时,由于CO2中氧元素的引入改变旁路熔滴表面的受力形式,使得旁路熔滴尺寸明显减小,熔滴过渡形式转变为稳定的射滴过渡,并且焊缝成形较好.
英文摘要：
Double-wire bypass coupled arc（GMAW）is a new high-efficiency welding method,which can be used to reduce obviously the heat input of work-piece along with the realization of high metal melt-laying rate.The metal drop transfer process of the double-wire GMAW is taken with a high speed camera based on passive vision sensing method and the transient process of melting drop is obtained and analyzed by means of comparison.The result shows that the size of bypass melting droplet is larger when pure argon gas is taken as shielding gas and it is difficult for the droplet to transit into the weld pool.When the mixed gas of 80% Ar and 20% CO2 is taken as shielding gas,the mode of force action upon the bypass droplet surface is changed due to the introduction of oxygen element from CO2,making its dimension reduced evidently,also its transfer style changed from globular transition to spray transition,resulting in a good weld appearance.
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