External Longitudinal Magnetic Field Effect on MIG Droplet Transfer Numerical Simulation Study Note

Literature Overview

This paper published in Hot Working Technology (Volume 52, Issue 1, 2023, pp. 127-130) by Huang Zehan, Han Shaohua, Xue Dingqi, and Gu Tianqi from Fuzhou University investigates the effect of an external longitudinal magnetic field on droplet transfer in gas metal arc welding (GMAW/MIG). The research was supported by the Fujian Natural Science Foundation (2017J05077). The authors established a two-dimensional axisymmetric numerical model considering the external longitudinal magnetic field to simulate droplet temperature, size, and detachment velocity using ER304 stainless steel wire with argon shielding gas. The simulated droplet size results showed good agreement with experimental measurements.

Core Technical Findings

The study reveals that when other welding parameters remain constant, increasing the external longitudinal magnetic field within a certain range causes the droplet radial length at detachment to gradually increase while the axial length gradually decreases. The droplet shape transitions from an elongated spherical form to a flattened spherical form. The transition frequency gradually decreases with increasing magnetic field strength. However, the effect of the external longitudinal magnetic field on droplet detachment temperature and detachment velocity is indirect and relatively small.

Droplet Transfer Mechanism Analysis