Effect of Si to Mn Mass Ratio in Weld Metal on Droplet Transfer and Arc Stability of Stainless Steel Flux-cored Wire During Low-current Welding

The effect of Si to Mn mass ratio in weld metal on droplet transfer and arc stability of E08L3T0-1 flux-cored wires during welding with the current of less than 100 A were investigated by self-made droplet collection device, high speed photometer and arc welding quality analyzer. The results show that with the increase of Si to Mn mass ratio in weld metal, the proportion of large-scale droplet decreased first and then increased, and the proportion of small-scale droplet increased first and then decreased. When Si to Mn mass ratio was 0.311, the proportion of small-scale droplet was the largest, and the proportion of large-scale droplet was almost the smallest. The droplet transfer form of stainless steel flux-cored wire was non-axial short-circuit transition. When Si to Mn mass ratio was 0.311, the stability of deoplet transfer was the best, and the degree of splash was the lowest; also, the arc stability was the best.