Influence of oxidation on flow structure in laser-oxygen cutting

Abstract

In this paper, a three-dimensional axial symmetrical model of laser cutting is established by adopting N–S equation and shearing-stress transport k-ω turbulent model. Numerical simulation is carried out to analyze the flow field of shield gas inside a cut kerf; the results include velocity and pressure distribution and mass flow rate. The effects of oxidation on flow field are examined, and the formation of gas flow separation and vortex are predicted. The results show that the gas flow structure in the kerf is directly affected by the reaction between iron and oxygen in the case of laser-oxygen cutting.

A new thin sheet heat source model for active gas melt laser cutting

“…A constant temperature heat source model was used to analyze the thermal stress by Yilbas et al [5], and the results showed that the increase of cutting speed would increase the thermal stress level of the cutting edge. The flow field of active gas was analyzed by Hu et al [6], and the results show that the gas flow structure in the kerf is directly affected by the reaction between iron and oxygen in the case of laser-oxygen cutting. An analytical model for striation formation in the laser cutting was proposed by Wee et al [7], and power absorption over the cut front, effect of oxidation and melt film thickness were predicted in the model.…”