基于视觉的MAG焊气孔缺陷图像特征初步探讨

Preliminary discussion about image character of gas pore in MAG welding based on vision sensing

关键词:  MAG焊  视觉传感  焊接缺陷  熔池特征

Key words:  metal active-gas welding  vision sensing  welding defect  molten pool character

摘要:

针对MAG焊特点,利用被动式熔池视觉传感系统,采集到清晰的熔池图像;通过同步对比试验方法,系统地对焊接气孔缺陷与熔池图像特征信息之间的关系进行了研究,提取了表面气孔、内部气孔(夹渣)对应的熔池图像特征,并从灰度均值和标准差的角度研究了焊接气孔缺陷产生过程中熔池图像变化情况及奇异特征。试验表明,通过熔池视觉图像特征判断气孔焊接缺陷,具有良好的可行性,为基于视觉传感的焊接缺陷自动识别提供了技术依据;一种图像特征可能预示有多种焊接缺陷产生的可能,一种焊接缺陷可能有多种图像特征显示。

Abstract:

A passive vision sensing system to acquire the image of molten pool inMAG welding was set up and many typical molten pool imageswere obtained.The relationship between the typical gas pores and the characteristics of molten pool images were studied by sync contrast experiments. Many molten pool imageswith surface gas pores and inner gas pores were obtained, and the change of the images and the strange characters were studied from the view of gray mean and gray standard deviation. The experimentsindicate that it is feasible to judge the pores by characteristics of the vision images which offers the technological foundation for automatic identification of welding defect on the base of vision sensing.The experiments and the analysis indicate that one type of image may predicate several types of welding defect, one type of welding defect may also shows several types of image characters.