Three-dimensional modelling of the laser-induced plasma plume characteristics in laser welding

摘要: Modelling results are presented concerning the spatial distribution of plasma parameters in a laser-induced plume with laser welding as research background. In modelling, characteristics affected by many factors, such temperature and flow velocity the?metal vapour leaving welded workpiece surface, shielding gas injected coaxially beam, assisting laterally respect to workpiece, energy absorption radiation heat loss plume. Typical computed distributions temperature, velocity, concentration, coefficient refraction index within continuous-wave (CW) CO2 an iron calculation example. The predicted temperatures shown be reasonably consistent corresponding experimental data. It is also that metal-vapour/shielding-gas momentum ratio plays important role determining height formed welding. Due cooling effect gas, dimensions will become smaller thus can reduced increasing shielding-gas velocity. may significantly affect used control on process.