Research on full position CMT welding process for circular pipes

Abstract

Abstract The CMT welding technology is adopted to solve the difficulties in full-position welding of circular pipes, and a robotic arm is controlled to achieve automatic full-position welding. The characteristics and laws of weld formation are studied by adjusting technology parameters like welding current, angle, and speed. The results show that once the welding current increases, the fusion depth and width of the weld simultaneously increase. However, as the welding speed increases, the depth and width of fusion decrease. Root welding experiments indicate that the optimal morphology of the root weld is achieved under the welding current of 200 A at the 0.2 m/min welding speed. In the weld filling experiment, both the left and right passes use the welding current of 260 A at the 0.2 m/min welding speed, which can fill the weld with two passes and achieve complete well formation.