Numerical Simulation Of A Wire Of Laser Cladding Of Inconel 625 On A36 Steel Plate

For the optimization of laser hot-wire cladding technology and its cladding quality, a transient heat transfer numerical model for laser cladding of Inconel 625 on A36 steel plate is established to investigate cladding heat fields. The control equation was dispersed under some boundary condition, and the simulation program was compiled in FOTRAN.A combined heat source with plate heat source and body heat source is built based on the characteristic of bigger depth in laser wire cladding than that in laser powder cladding. And the optimize proportion between Gauss heat source and hemispherical body heat source was choose. The optimize radius of laser beam was determined by comparison of numerical data with experimental data. According to statics analysis method, the partial differential equation of the two dimensional geometry for cladding layer was established, with for order Runge- Kutta method, the function expression of two dimensional geometry for cladding layer was solved. With the comparison of the temperature field for different thermal conductivity of air, optimize thermal conductivity of air which is included in lase hot-wire cladding system was determined.What contained laser heat source model and laser beam radius and optimize thermal conductivity of air was input into built numerical model. With the use of complied program for temperature field, it could predict the variation of temperature filed and shape of weld pool in different process parameters(laser power and laser scanning rate). The results show that while both the penetration and pool width increase with the increase of laser power, the volume of molten pool expanded at the same time. When the laser scanning rate increase, the volume of molten pool became narrow, but both the penetration and pool width decreased at the same time. The maximum temperature would increase along with the increase of the laser power, but it would decrease along with the increase of the laser scanning rate.The research of this paper could provide basic data and theoretical guidance for the industrial production of laser hot-wire cladding...