Study on the Dispersion Behavior and Temperature of Spatter caused by CO₂ Gas Shielded Arc Welding

Abstract

The spatter is cooled during scattering by the air. So, many spatters change from the melt state to the solidification state. Spatter does not adhere to the base metal and peripheral equipment in the solidification state. But, the possibility of adhering to them rises, when the spatter melts. In other words, the adhesion of the spatter is influenced by its cooling condition, that is, the scattering route and velocity of the spatter. Therefore, in order to clarify its adhesion behavior, it is very important to estimate its scattering behavior. Then, is this study, the scattering behavior of the spatter is CO₂ gas shielded arc welding is measured and the scattering behavior and terperature of the spatter are simulated. As the results of examining 300 spatters, it is indicated that the initial velocity of the spatter which arise from welding point is about 10 m/s or less and the initial angle of elevation is 70 degree or less. In addition, it is indicated that the Reynolds number of scattering spatter is 7 from 2 and the drag coefficient is 30 from 10. Moreover, when scattering locus of the spatter are simulated by substituting the relationship between drag coefficient and Reynolds number into the momentum equation of the spatter, the results agree well with the experimental results.