基于高速影像的激光焊金属蒸汽周期性分析  

Periodic analysis of metal vapor during laser welding based on high-speed camera

作　　者：刘桂谦[1] 高向东[1] 

机构地区：[1]广东工业大学机电工程学院,广东广州510006

出　　处：《焊接技术》2013年第6期7-9,84,共3页Welding Technology

基　　金：国家自然科学基金资助项目(51175095);广东省自然科学基金资助项目(10251009001000001;10251009001000001);中国高等学校博士学科点专项科研基金资助项目(20104420110001)

摘　　要：在激光焊接过程中,材料表面强烈气化,形成较强电离的金属蒸汽。这种致密的气体可以逆着光束入射方向传输,对激光有着显著屏蔽作用,大大降低了入射到材料内部的能量密度,影响焊接质量。以10 kW大功率光纤连续激光焊接不锈钢钢板为试验对象,应用高速摄像机摄取金属蒸汽图像,将数据图像进行处理、分割,提取金属蒸汽面积特征值,作为衡量研究金属蒸汽周期性的稳定参数。分析结果表明,金属蒸汽图像的面积能有效地反映金属蒸汽周期性变化。During the laser welding,the surface of the material gasifies strongly and produces the ionized metal vapor.This dense vapor transmits against the direction of the laser beam.It has a significant shielding effect to obtain good welding quality.An infrared sensitive high speed camera arranged off-axis orientation of laser beam was used to capture the dynamic thermal images of a molten pool during welding of type 304 stainless steel plates at a continuous wave fiber laser power of 10 kW.The area of metal vapor were calculated as the charecteristic parameter by using image processing technology.Experimental results showed that the area of the image of metal vapor could reflect the periodic changes in the welding,which was the foundation for monitoring and control of welding quality in real time.

关 键 词：大功率光纤激光焊接 金属蒸汽 图像处理 

分 类 号：TG456.7[金属学及工艺—焊接]