CO_2气体保护焊短路过渡熔滴尺寸的研究

Research on droplet size in short-circuiting transfer with CO_2 gas shielded arc welding

利用高速摄影系统拍摄了CO_2气体保护焊熔滴过渡过程,借助高速摄影图像,通过椭球-球转换法精确测量了短路时的熔滴尺寸,分析了焊接电流、电弧电压、焊丝伸出长度和焊接速度对熔滴尺寸的影响。结果表明,熔滴尺寸与焊接电流成反比,与电弧电压成正比,随着焊丝伸出长度的增加,熔滴尺寸先减小后增大,在可焊的范围内,焊接速度几乎不影响熔滴尺寸。研究结果可为精确控制熔滴尺寸、提高焊接质量提供参考。

In order to observe the metal transfer process in CO_2 gas shielded arc welding,a high-speed photography system was established and the droplet images were captured by high-speed camera. Based on these images,the droplet size at the moment of short-circuit was accurately measured by ellipsoid-sphere conversion method,and the effects of welding parameters including welding current,welding voltage,wire extension and welding speed on droplet size were also analyzed. The results show that,the droplet size is inversely proportional to welding current and proportional to welding voltage,with the increase of the length of wire extension,the droplet size decreases first and increases later. Welding speed hardly affects the droplet size within the allowable welding range. All the study provides a reference for precisely controlling droplet size and improving weld quality.