Characterization of metal transfer modes of GMAW based on metallurgical reaction

The characteristics of droplet transfer modes of GMAW involving welding metallurgy reactions were reviewed. The results showedthat the main metallurgical reactions in the arc had different effects on the dominant force acting on the droplet. The relationship between the metallurgical reaction of welding wire and the mode of droplet transfer depended on the mechanical conditions of droplet transfer. When the metallurgical reaction increased the F^s or decreased the F_h,the droplet transfer mode could be improved. For flux cored wire,increasing the content of TiO₂,Si-Fe,Al₂O₃ and SiO₂ additives in the flux core,increasing the welding current,increasing the Ar content in the shielding gas and increasing the filling rate of the flux core could improve the droplet transfer moge. For solid wire,the coating composition of copper-free wire,as well as increasing the welding current,reducing the wire diameter,increasing the Ar content in the shielding gas,and using direct current electrode positive could improve the droplet transfer mode.