Study on the Dynamic Behavior of Molten Pool during the Stationary Pileup of the Double-electrode Micro Plasma Arc Welding

doi:10.3901/JME.2018.02.070

Abstract

Abstract: Aiming at the dynamic behavior of the droplet on the molten pool during the stationary pileup process of the double-electrode micro plasma arc welding, a mathematical model of the coupling effect between the droplet and the molten pool is established, the flow shape of the molten pool and the complex fluid flow are mainly calculated by the combination of surface tension and droplet impact momentum. It is found that, when the droplet carries heat to hit the molten pool, the bath temperature rises. When the droplets impact the pool of the moment, the maximum speed in the pool can be increased to 2.06 m/s. With the increase in the number of droplets entering the molten pool, the bath height increases, the melting width increases, the penetration depth is almost constant. As the bypass current increases, the base metal temperature is low. Resulting in a lighter depth, a higher height and a smaller weld width. Molten pool liquid metal flow is not stable. After increasing the cooling time, the radius of each layer decreases as the number of layers increases.

Key words: double-electrode micro plasma arc welding, droplet impingement, numerical simulation, stationary pileup, weld pool dynamics

CLC Number:

TG452

HUANG Jiankang, YANG Maohong, YU Shurong, SHI Yu, FAN Ding. Study on the Dynamic Behavior of Molten Pool during the Stationary Pileup of the Double-electrode Micro Plasma Arc Welding[J]. Journal of Mechanical Engineering, 2018, 54(2): 70-76.

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