A three dimensional numerical simulation model of optical laser drilling weld was established,by using adaptive heat source with real-time variation of keyhole shape.The laser heat source was loaded at the time-varying gas/liquid interface,considering heat and mass transfer in the process of gas and liquid phase transition.The momentum loss and latent heat due to solidification and melting was dealt with by enthalpy-porosity technique.The keyhole wall was calculated by solving VOF equation,mainly considering recoil pressure induced by the metal evaporation and surface tension.The result shows that the welding process may produce flash,overlap and reinforcement.Welded joint is formed when the metal liquid flows back from the front to the rear of the keyhole,and a swirl may occur on the left and right sides the welding pool at the rear of the keyhole.The time of plasma generation is very short,and the maximum velocity of plasma increases rapidly to about 102.95 m/s before drilling,then it drops to about 80 m/s after drilling.The simulation analysis provides a theoretical basis for the actual welding process.
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吴家洲,张华,张奇奇,罗兵兵.激光穿孔焊接过程热流场数值模拟[J].激光与红外,2018,48(1):24~29 WU Jia-zhou, ZHANG Hua, ZHANG Qi-qi, LUO Bing-bing. Numerical simulation of temperature and velocity field in laser drilling weld[J]. LASER & INFRARED,2018,48(1):24~29