高频复合双钨极氩弧焊电弧行为规律

高频复合双钨极氩弧焊是一种高效优质的新型焊接方法,为研究该焊接过程中的复合电弧行为规律,设计了电弧静态特性和动态特性试验,电弧静态特性试验中分别引入0~80kHz的高频脉冲电流并采用高速摄像技术拍摄电弧形态。结果表明,复合电弧形态明显异于不加高频的双钨极电弧形态,整体呈对称三角形,电弧外轮廓更趋直线化,电弧直径更小。脉冲频率低于50kHz时,随着脉冲频率的提高,复合电弧收缩效果越明显,电弧能量密度和电弧挺度越高。采用电弧上台阶的方法研究复合电弧的动态迁移行为,发现复合电弧稳定性强,电弧刚度高,具有尖端效应、非跳弧效应和高频自定位效应,深入分析其产生机理。

Arc behavior of high frequency hybrid twin-electrode TIG welding

High frequency hybrid twin-electrode TIG welding is a new type of welding method with high quality and efficiency. In order to study its arc behavior,the arc static characteristic and dynamic characteristic tests are designed by using high-speed photography technology to photograph arc profile. The high frequency pulse currents of 0~80 kHz are introduced in the arc static characteristic test. The results show that the hybrid arc shape with high frequency pulse current is obviously different from that without high frequency pulse current,and is symmetrical triangle on the whole, and the arc outer contour is more straight,the arc diameter is smaller. When the pulse current frequency is below 50 kHz,the higher the pulse current frequency,the greater the hybrid arc compression,and the higher the energy density and stiffness of the hybrid arc. The dynamic transition behavior of hybrid arc is studied by using the method of arc step-up,the results show that the hybrid arc has strong stability and high arc stiffness with the effects of cutting-edge,non-arc-jumping and high frequency self-localization,and its mechanism is deeply analyzed.