基于图像处理的短路过渡过程稳定性分析

利用数字图像处理技术,对CO₂焊短路过渡过程的高速摄影图片进行了处理,获得了接触熔滴等效半径和残余熔滴等效半径的尺寸;分析了过渡频率和等效半径以及短路过渡过程稳定性的关系. 结果表明,当熔滴过渡频率最大时,并未达到最佳焊接条件;残余熔滴等效半径在小范围内离散分布,其平均值在最优焊接参数时达到最小;接触熔滴等效半径平均值与过渡熔滴体积成正比,该值越小,表明过渡过程越稳定.

Study on stability of short-circuiting transfer process based on digital image processing technology

The high-speed video images of short-circuiting transfer process in CO2 arc welding are processed by digital image processing technology, obtaining the equivalent radius size of contact droplet and residual droplet. The relationship between the transfer frequency and equivalent radius and the stability of short-circuiting transfer process is analyzed. The result shows that the welding parameter that corresponds to the largest transfer frequency is not the optimal parameter. Further, on a small scale the equivalent radius distribution of residual droplet is discrete, and the average value is minimum under the condition of optimal welding parameter. Meanwhile, the average equivalent radius of contact droplet is proportional to the volume of the transfer droplet. The smaller the average value of contact droplet size, the more stable of the transfer process.