Numerical analysis on the effect of process parameters on deposition geometry in wire arc additive manufacturing

Abstract

Here we develop a two-dimensional numerical model of WAAM to determine the relationship between process parameters and deposition geometry, and to reveal the influence mechanism of process parameters on deposition geometry. From the predictive results, a higher wire feed rate matched with a higher current could generate a larger and hotter droplet, and thus transfer more thermal and kinetic energy into melt pool, which results in a wider and lower deposited layer with deeper penetration. Moreover, a higher preheat temperature could enlarge melt pool volume and thus enhance heat and mass convection along both axial and radial directions, which gives rise to a wider and higher deposited layer with deeper penetration. These findings offer theoretical guidelines for the acquirement of acceptable deposition shape and optimal deposition quality through adjusting process parameters in fabricating WAAM components.

Research on arc root stagnation when small current is interrupted in self-excited circuit breaker

“…(3) The arc plasma fluid is locally neutral Newtonian fluid and incompressible turbulence flow [41,42]. (4) The effect of metal vapor is ignored here [41].…”

“…(5) The arc column has complete ionization [41], and its physical property parameters are only the function of temperature and air pressure [3,28].…”