Processing Research Of Tandem Pulsed MIG Welding

The efficiency, environmentalism and intelligentize of welding have become the urgent need of the development of the steel structure in 21st century. As for the normal MIG/MAG, welding defects such as incomplete penetration, worsening formation of weld would be caused when the welding speed was increased. To solve the problems above in premise, an efficient and applied Tandem pulsed MIG has been studied in this paper.The research developed Tandem pulsed MIG system, in which the two welding power sources were connected by the double-wire pulsed controller. The controller implemented the push-pull output of the two welding power sources and thus reduced the interference between the two arcs. The two arc welding torches were independent without electric connection and their power received from two respective welding power sources. This design avoided the influence between the two welding power sources and made the arc well controlled.This paper has analyzed the theory of the double-wire pulsed MIG for the main parameters influenced the welding process through a lot of trials. This research adopted two welding process method which including the both wire used ?1.2mm wire and the leading wire used ?1.2mm wire while travling wire used ?1.6mm wire, then compared the parameters in the two welding process such as the welding current, welding voltage, pulsed frequency, pulsed width ratio, wire angle and the stem elongation which affected the welding process. Using high-speed camera/photography, the metal transfer and arc behavior under different welding parameters were observed and recorded, combined the photo electricity signal testing system for this trial, the parameter range which was the guidelines for the practice welding project was ascertained.