Numerical simulation of the weld pool dynamics during pulsed laser welding using adapted heat source models
Numerical simulation of the weld pool dynamics during pulsed laser welding using adapted heat source models
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DOI：
10.1016/j.procir.2018.08.044
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
F. Lange;A. Artinov;M. Bachmann;M. Rethmeier;K. Hilgenberg
中科院分区：
文献类型：
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作者：
F. Lange;A. Artinov;M. Bachmann;M. Rethmeier;K. Hilgenberg
通过激光能量、金属熔化和熔池发展的瞬态模拟，观察了aisi304钢脉冲激光束焊接过程中蒸汽毛细管的演变和熔体的凝固过程。采用相场法研究了焊接过程中液气界面的演变和行为，描述了焊接过程中的冷凝相和气相。考虑了相变、反冲压力、热毛细管和自然对流、蒸发和温度相关材料性能的影响。采用考虑菲涅耳吸收模型的类高斯热源来模拟激光束的能量输入。热源模型通过一种新的描述锁孔内多束反射的经验方法得到了扩展。为了验证新模型的正确性，将数值计算结果与实验数据进行了比较，结果表明熔池的大小和形状符合较好。
A transient simulation including the impact of the laser energy, the melting of the metal and the development of the weld pool was conducted to observe the evolution of the vapor capillary and the solidification of the melt in pulsed laser beam welding of AISI 304 steel. The phase field method was implemented to investigate the evolution and behavior of the liquid-gas interface during welding and to describe the condensed and vapor phases. The effects of phase transition, recoil pressure, thermo-capillary and natural convection, vaporization and temperature dependent material properties were taken into account. A Gaussian-like heat source under consideration of the Fresnel absorption model was used to model the energy input of the laser beam. The heat source model was extended by a newly developed empirical approach of describing multiple beam reflections in the keyhole. To validate this new model, the numerical results were compared to experimental data and good agreement regarding the size and shape of the weld pool was observed.