Effects of process variables on laser direct formation of thin wall
Effects of process variables on laser direct formation of thin wall
复制标题
DOI：
10.1016/j.optlastec.2005.08.012
复制
发表时间：
2007-03
影响因子：
5
通讯作者：
JiChang Liu;Lijun Li
中科院分区：
文献类型：
--
作者：
JiChang Liu;Lijun Li
本文研究了工艺参数对单道次同轴激光熔覆金属薄壁的壁厚、粉末一次效率和成形速度的影响，建立了相应的分辨模型，并进行了实验验证。在一定的假设条件下，壁厚、粉末一次效率和成形速度均可定义为工艺变量的函数。壁厚等于单道激光熔覆形成的熔池宽度，由激光吸收率、激光功率、初始温度、扫描速度和熔覆材料的热物理性质决定。粉末的一次效率和成型速度都依赖于一个指数函数，该函数涉及熔池宽度与粉末流动直径的比率，该比率由工艺变量决定。另外，粉末进料速度对成形速度也有影响。本实验采用500W连续波(CW)CO_2激光器，采用单程同轴激光熔覆技术制备薄壁样品。实验结果与计算值吻合较好，但存在一定误差。
In this paper, effects of process variables on wall thickness, powder primary efficiency and speed of forming a thin metallic wall in single-pass coaxial laser cladding are investigated, and some resolution models are established and testified experimentally. With some assumptions, each of wall thickness, powder primary efficiency and formation speed can be defined as a function of the process variables. Wall thickness is equal to width of the molten pool created in single-pass laser cladding and determined by laser absorptivity, laser power, initial temperature, scanning speed and thermo-physical properties of clad material. Powder primary efficiency and formation speed are both dependent on an exponential function involving the ratio of melt pool width, which is decided by the process variables, to powder flow diameter. In addition, formation speed is influenced by powder feed rate. In present experiment, a 500W continual-wave (CW) CO2laser is used to produce thin-wall samples by single-pass coaxial laser cladding. The experimental results agree well with the calculation values despite some errors.