送粉式激光熔覆熔池深度的分析模型及其影响因素  

Analytical Model and Relevant Factors of Molten Pool Depth in Case of Laser Cladding with Powder Feeding

作　　者：张庆茂[1] 刘喜明[2] 孙宁[1] 关振中[3] 

机构地区：[1]解放军军需大学,长春130062 [2]吉林工学院材料科学系,长春130012 [3]中国科学院长春光学精密机械研究所,长春130025

出　　处：《焊接学报》2000年第4期42-45,共4页Transactions of The China Welding Institution

基　　金：吉林省工业发展基金资助项目(19980101-08)

摘　　要：在分析送粉式激光熔覆过程中能量分配和粉末颗粒云对激光束衰减规律的 基础上，通过建立能量平衡方程，推导出熔池深度与工艺参数之间的定量关系表达式， 系统分析了影响熔池深度的因素。结合相关的物理参数、工艺参数和金相检测的熔覆 层宏观参数，对方程进行了理论计算。同金相法实际检测的熔池深度相比，理论值高于 实际值，两者反映的规律是一致的，客观地反映了激光熔覆中工艺参数和工艺结果之间 的关系。在激光参数保持不变的条件下，熔池深度随扫描速度和送粉速率的增大而减 小。为熔覆工艺参数的优化、熔覆层质量的评定和现场控制系统的设计提供了理论依 据。On the basis of an analysis on the feeding pattern of the coating material, its behavior in the laser beam, distribution of laser energy and the attenuation of laser beam caused by particle's cloud during the process of laser costing, the methods to calculate the interaction efficiency of laser and particle's speed are presented. Then an analytical model of the molten oppl depth was establised, relating to the parameters of the processes. As the molten pool depth was calculated by the oretical method and compared with measurments of metallography, itis found that the theoretical results is higher than the experimental results, but they coincide well with each other quantitatively and are consistent in reflecting the objective realty of the process. For given laser parameters, the molten pool depth becones smaller with the increase of powder feeding the and scanning sped. This model is helpful to optimize process parameters, understand the major relationship between the process parameters and the results, and design on -- time control system.

关 键 词：熔池深度 熔覆工艺 能量平衡 现场控制系统 

分 类 号：TG456.7[金属学及工艺—焊接]