激光熔覆工艺参数对马兰戈尼效应的影响

Influence of laser cladding process parameters on Marangoni effect

纯铜表面激光熔覆铜钨复合涂层相当困难,而马兰戈尼效应对于激光熔覆形成的熔池具有很重要的作用,所以有必要研究激光功率扫描速度以及光斑半径的变化对于马兰戈尼效应的影响。因此,本研究采用COMSOL软件对于纯铜表面熔覆铜钨复合涂层进行数值模拟,结合对流换热分析了不同激光功率、扫描速度以及光斑半径下马兰戈尼效应的变化情况。结果表明,在纯铜上激光熔覆铜钨复合涂层时,激光功率、扫描速度以及光斑半径越小,马兰戈尼效应越大。因此,适当地增大激光功率扫描速度以及光斑半径会使得马兰戈尼效应减弱,从而为得到更加优异的铜钨复合熔覆层做出理论指导。

It is very difficult to laser cladding copper-tungsten composite coating on pure copper surface,and the Marangoni effect plays an important role in the molten pool formed by laser cladding,so it is necessary to study the influence of the laser power scanning speed and the change of spot radius on the Marangoni effect.Therefore,in this study,COMSOL software was used to conduct numerical simulation of copper-tungsten composite coating on the surface of pure copper,and combined with convective heat transfer,the changes of Marangoni effect under different laser power,scanning speed and spot radius were analyzed.The results show that the smaller the cladding power,scanning speed and spot radius,the larger the Marangoni effect is.Therefore,the appropriate increase of laser power scanning speed and spot radius will weaken the Marangoni effect,so as to provide guidance for obtaining more excellent copper-tungsten composite cladding layer.