应用激光, 2019, 39 (4): 535, 网络出版: 2019-10-12   

基于LabVIEW的激光熔覆熔池特征的在线监测及分析

On-line Monitoring and Analysis of Laser Cladding Molten Pool Features Based on LabVIEW
作者单位
大连理工大学机械工程学院, 辽宁 大连 116024
摘要
为了研究激光熔覆过程中熔池的形状和尺寸信息, 采用与激光头同轴集成的CMOS相机对熔池进行拍摄, 借助LabVIEW视觉模块的图像采集和图像处理功能, 自主开发了一套激光熔覆熔池图像实时处理系统。通过此系统, 可在激光熔覆过程中在线监测熔池并快速有效提取熔池特征信息, 并得出激光熔覆三个主要工艺参数对熔池长度、宽度、面积的影响规律。采用半导体激光器对316L不锈钢粉末进行单道激光熔覆实验, 结果表明, 随着扫描速度由6 mm/s减至2 mm/s, 激光功率由700 W增至1 300 W, 熔池面积和宽度增大, 熔池长度相对其单道熔池长度平均值的波动程度增大, 熔池长度和面积随着送粉量在4.2 g/min至14.8 g/min 范围内的增加而增加, 而熔池宽度变化并不明显。熔池监测结果可作为激光熔覆闭环控制的输出, 通过控制输入参数维持熔池稳定, 获得良好熔覆效果, 为激光熔覆闭环控制研究奠定基础。
Abstract
In order to investigate the shape and size information of the molten pool in the laser cladding process, the CMOS camera integrated with the laser head is used to shoot the molten pool. With the help of the image acquisition and image processing functions of the LabVIEW vision module, a set of real-time processing system for the laser cladding molten pool image is developed. Through the system, the molten pool features of laser cladding process is monitored and extracted quickly and effectively, and the effects of three main process parameters on the length, width and area of the molten pool are obtained. The single track laser cladding experiment of 316L stainless steel powder was carried out by using semiconductor lasers. The results show thatthe area and width of the molten pool increase, and the fluctuation of the molten pool length relative to the average value of its single track increases when the scanning speed decreases from 6 mm/s to 2 mm/s, and the laser power increases from 700 W to 1300 W. The length and area of the molten pool increase as the amount of powder feeding increases in the range of 4.2 g/min to 14.8 g/min, and the change in molten pool width is not obvious. The detection results of molten pool can be used as the output of closed loop control of laser cladding, and the stability of the molten pool is maintained by controlling the input parameters, therefore, the good effect of the cladding is obtained, which lays the foundation for the study of the closed loop control of laser cladding.

刘旭阳, 刘伟嵬, 唐梓珏, 王振秋. 基于LabVIEW的激光熔覆熔池特征的在线监测及分析[J]. 应用激光, 2019, 39(4): 535. Liu Xuyang, Liu Weiwei, Tang Zijue, Wang Zhenqiu. On-line Monitoring and Analysis of Laser Cladding Molten Pool Features Based on LabVIEW[J]. APPLIED LASER, 2019, 39(4): 535.

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