吸烟焊枪在药芯焊丝CO_(2)气保焊中的作用

Effect of fume extraction torch in CO_(2) gas shielded arc welding with flux-cored wire

采用吸烟焊枪进行药芯焊丝CO_(2)气保焊,通过记录烟尘扩散形态和焊接电流电压变化,采用高速摄像分析熔滴过渡过程,以及对比焊缝表面成形和采用X射线探伤揭示焊缝缺陷,并与未吸烟时对比,研究了不同吸烟功率和焊枪倾角下吸烟焊枪的吸烟行为及其对焊接过程和焊接质量的影响.结果表明:焊接烟尘被有效吸入吸烟焊枪,其烟尘扩散形态整体呈锥形,并随吸烟功率的增加,其气流挺度增加,吸尘效果增强.熔滴过渡仍表现为大滴排斥过渡,吸烟只是使熔滴过渡频率稍有增加.采用不同功率以及焊枪倾角,均能得到表面成形良好和无缺陷的焊缝.

Fume extraction torch was adopted to complete CO_(2) gas shielded arc welding with flux-cored wire.Through recording fume diffusion pattern and change of welding current and welding voltage,analyzing droplet transition form by high-speed camera,comparing appearance of welds and revealing the weld defects by X-ray non-destructive testing technology,and comparing them with the situation without fume extraction,the performance of fume extraction torch under different fume extraction powers and torch inclination angles and its influence on welding process and welding quality are studied.The results show that welding fumes are effectively absorbed into fume extraction torch,the overall shape of the fumes is conical,and as the increase of fume extraction power,its stiffness increases and the effect of fume extraction is enhanced.The droplet transition form still appears as repelled globular transfer,and fume extraction only slightly increases the droplet transition frequency.Under different powers and given torch inclination angles,the welds are well formed and there are no defects in welds.