The humping bead formation mechanism in the thick-wire(φ3. 2) high-speed MAG welding process was studied. Using the high-speed camera system, the arc shape and weld pool flow were investigated. By analyzing the captured image , the viewpoint of dynamic equilibrium point was presented. The distance between the dynamic equilibrium point and the arc is the cause of humping bead formation. Any factors to prompt the dynamic equilibrium point to move to the arc, will prevent formation of humping bead. In contrast, any factors to prompt the dynamic equilibrium point away from the arc, will lead to the appearance of humping bead. Furthermore, the uphill and downhill welding experiments were designed to verify the correctness of the above discussion about humping bead formation mechanism.%对粗丝((Φ)3.2)高速MAG焊驼峰焊道缺陷的形成机理进行了研究.采用高速摄像采集系统对焊接过程中的电弧形态和熔池流动状况进行了高速摄像,通过对试验所得图像的认真分析,重点研究了粗丝((Φ)3.2)高速MAG焊驼峰焊道缺陷的形成机理,提出了动态平衡点的观点,认为动态平衡点远离电弧是焊缝产生驼峰焊道缺陷的根本原因.任何促使动态平衡点移向电弧的因素都有利于抑制焊缝产生驼峰焊道缺陷；任何促使动态平衡点远离电弧的因素都有利于驼峰焊道缺陷的形成.同时利用上坡焊和下坡焊试验对驼峰焊道形成机理进行了焊接试验验证.
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