MAG焊中的驼峰焊道形貌与临界焊接速度

High-speed MAG welding experiments were conducted, the corresponding critical welding speed was obtained through observing the humping beads of weld formation. The spacing of adjacent humps under different welding velocities and same welding velocity but different welding currents was compared. The changing regularity and the generating tendency of humping bead are determined. the morphology characteristics of the humping bead were further analyzed based on the transverse section photos of the “hump” and the “ valley” in a humping bead. The effects of the parameters including welding current, welding voltage and the compositions of shielding gases on the critical welding speed of MAG welding were investigated.