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熔滴旋转喷射过渡MAG焊是用于钢结构的一种高效焊接方法 ,在窄间隙焊和角焊缝时还可以克服焊接时侧壁的熔合不良等缺陷。本文用高速摄影方法拍摄了Ar+O2 保护气体时旋转喷射过渡的熔滴过渡形态 ,建立了液尖—液流束运动的相关分析模型 ,并由此分析讨论了熔滴运动的动态变化过程和旋转参数。结果表明 ,用本文提出的“相关分析”方法 ,可以确定液尖与液流束运动的主从关系。在脉冲旋转喷射过渡期间 ,液尖、液流束均绕焊丝轴线做旋转运动 ,但二者旋转速度不完全一致。液流束的旋转半径与液尖的偏转角有关。在液尖─液流束─阴极斑点组成的运动系统中 ,液尖的运动起主导作用 ,阴极斑点对液尖、液流束的运动有拖曳作用。作用于阳极斑点上的不平衡力 ,是影响熔滴旋转喷射过渡的主要因素。
Drop Rotating Spray Transition MAG welding is an efficient welding method for steel structures that overcomes defects such as poor fusion of the sidewalls during welding in narrow gap and fillet welds. In this paper, the transition morphology of the droplet during the rotation of the jet of Ar + O2 gas was photographed by high-speed photographic method, and the correlation analysis model of the liquid-tip-liquid flow was established. The dynamic change of droplet movement was analyzed and discussed. Rotate the parameter. The results show that using the “correlation analysis” method proposed in this paper, we can determine the principal and subordinate relations between the liquid tip and the liquid stream motion. During the pulse jet transition, both the liquid tip and the liquid jet rotate about the axis of the wire, but the rotational speeds of the two are not exactly the same. The radius of rotation of the fluid stream is related to the deflection angle of the liquid tip. In the liquid tip - flow stream - cathode spot motion system, the tip of the liquid plays a leading role in the movement of the cathode spot on the liquid tip, the flow of tow drag effect. The imbalance force acting on the anode spot is the main factor that affects the transition of droplet rotary jetting.