无辅助光源图像法TIG焊焊缝跟踪传感系统

Image Method Seam Tracking Sensing System without Auxiliary Light in TIG Welding

焊接过程中焊炬自动跟踪焊缝对保证焊接质量 ,提高自动化程度有着极其重要的实际意义。焊缝自动跟踪技术的关键是焊缝位置的传感方法 ,本文在深入研究TIG焊电弧发光行为的基础上 ,结合实际的焊接工况 ,建立了一套利用电弧弧光检测焊缝位置的图像传感系统。该系统在硬件方面解决了图像采集与焊接电流的同步以及图像品质的提高等问题 ,在计算机软件方面解决了阈值与图像品质相匹配以及焊缝位置的提取等问题。生产实际应用结果表明 ,该系统在检测精度、处理速度、稳定性、可靠性及实际工况的适应性等方面完全满足高质量焊缝对焊接过程自动对中的要求。

In the welding process,it is very important for welding torch automatically tracking the weld seam to assure welding quality and improve welding automation level.The striking point of seam tracking technique is how to sense the seam position.Through deep going research on activity of arc light emitting and linking with the practical welding condition,a image sensor system was built in this paper,which could detect the weld seam position utilizing the arc light.This system solved many difficulties in hardware,for example,the synchronization between image acquisition and welding current,the enhancement of image quality and so on.Moreover,the difficulties in computer software were solved as well such as matching of image quality with image threshold,detecting of weld location and so on.The result of using this system in practical welding production shows that the system could fully satisfy the requirement of automatic seam tracking to acquire high quality weld in many respects such as detection precision,processing speed,stability,reliability and adaptation to practical industry condition.