Effect of plasma main arc on droplet transfer in skew-coupling arc welding
Effect of plasma main arc on droplet transfer in skew-coupling arc welding
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DOI：
10.1016/j.jmatprotec.2020.116799
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发表时间：
2020-11
影响因子：
6.3
通讯作者：
Shanwen Dong;Bin Xu;Zhenyang Lu;Shujun Chen;F. Jiang
中科院分区：
文献类型：
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作者：
Shanwen Dong;Bin Xu;Zhenyang Lu;Shujun Chen;F. Jiang
针对斜耦合双丝间接电弧焊（SCA）大电流下阴极斑点力阻碍阴极熔滴过渡的问题，提出了一种等离子弧控制熔滴过渡的方法。从等离子弧电流（PAC）和等离子气体流量（PGFR）的角度分析了等离子弧对熔滴过渡的影响。采用电信号和高速摄像采集系统，对电弧的电流电压波形、电弧形态和熔滴过渡过程进行了研究。结果表明，等离子弧控制SCA焊熔滴过渡是可行的、有效的。随着PAC的增加，等离子弧偏转的程度增加，并且增加PGFR对SCA的顶部有收缩作用。增加PAC或PGFR使TWIA电流在小范围内变化，等离子弧电压增加。增加PGFR比增加PAC更能有效地促进阴极熔滴的过渡，因为等离子弧和TWIA的双轴推力增强了TWIA对阴极熔滴的等离子体流体力。等离子体气体对阳极熔滴的冷却作用减弱了等离子体气体对阳极熔滴转捩的促进作用。悬在阴极丝上的流体束的存在对改善阴极熔滴的转捩有重要意义。PGFR和PAC可以协同调节，促进阳极和阴极液滴的过渡过程。
A method of controlling droplet transfer by plasma arc was proposed to solve the problem that cathode spot force hindered the transition of cathode droplet under high current of twin-wire indirect arc (TWIA) in skew-coupling arc (SCA) welding. The effects of the plasma arc on droplet transfer were analyzed from the perspectives of plasma arc current (PAC) and plasma gas flow rate (PGFR). The current-voltage waveform, arc shape and the transition process of droplet were studied by using an electric signal and high-speed camera acquisition system. The results show that controlling droplet transfer by the plasma arc is feasible and effective in the SCA welding. With the increase of the PAC, the degree of the plasma arc deflection increased, and increasing the PGFR has a shrinkage effect on the top of the SCA. Increasing the PAC or the PGFR made the TWIA current vary in a small range, and the plasma arc voltage increase. Increasing the PGFR is more effective to promote the transition of cathode droplet than increasing the PAC, because the plasma fluid force of the TWIA on cathode droplet is enhanced by the double axial thrust of the plasma arc and the TWIA. The cooling effect of the plasma gas on anode droplet weakens the promoting effect of the plasma gas on the transition of anode droplet. The existence of the fluid beam hanging at the cathode wire is important to improve the transition of cathode droplet. The PGFR and the PAC could be cooperatively adjusted to promote the transition process of anode and cathode droplet.