Abstract
The effects of welding parameters and wire compositions on the droplet transfer of CO2 arc welding by flux-cored wire, have been examined by means of photograph by a high speed camera.As the welding current and the argon content in CO2 shielding gas are increased, the droplet transfer becomes more preferable; the average droplet diameter decreases and the transfer frequency increases.The wire cross-sectional shape has almost no influence on the droplet transfer. Increase of flux percentage in wire is effective in the improvement of the droplet transfer.As the increase of TiO2, Fe-Si and Al2O3 or the decrease of CaF2 content in flux, the droplets become smaller and transfer more frequently. The effect of iron powder and Fe-Mn content is almost none. These variations of droplet transfer can be mainly explained by the repulsive force of slag vaporization in the droplet suspended at the tip of the wire.
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