碱性药芯焊丝熔滴过渡特性及工艺性分析

利用高速摄像和汉诺威弧焊分析仪,在富氩气体保护条件下,在不同的焊接参数下对3种碱性药芯焊丝样品进行了测试和分析. 结果表明,较小焊接参数时,熔滴过渡形式为粗熔滴排斥过渡,电弧稳定性差,飞溅大;随着焊接参数的增大,熔滴过渡逐渐转变为细熔滴过渡,过渡过程趋于稳定. 熔滴受到较大的排斥力以及熔体的表面张力大是造成大颗粒飞溅的主要原因,较长的渣柱对熔滴过渡具有导向作用,细化熔滴和形成稳定、较长的渣柱是改善碱性药芯焊丝工艺性的重要途径.

Metal transfer characteristics and usability of basic flux-cored wire

Using high-speed camera and Analysator Hannover, three kinds of basic flux-cored wires were tested and analyzed under different welding parameters with rich argon shield gas. The results show that the metal transfer mode was globular repelled transfer with poor arc stability and much spatter under lower welding parameters. With increasing of welding parameters, the metal transfer gradually changed to small droplet transfer and the process became stable. Large granular spatter was caused from the repulsive force acting on the molten droplet and the surface tension of the melt. The long slag column played a guiding role on the metal transfer. Refining the droplet and forming stable and long slag was important to improve the usability of basic flux-cored wire.