Laser-electric arc hybrid welding device and method for U rib

The invention provides a laser-electric arc hybrid welding device and method for a U rib, and relates to the technical field of bridge manufacturing. The laser-electric arc hybrid welding device for the U rib comprises a laser welding head and an electric arc welding gun, the laser welding head and the electric arc welding gun are arranged in a spaced mode, and the laser welding head comprises an optical fiber installation module, a collimation module, a focusing module, a reflection module, a protection lens module and an air knife module which are detachably connected in sequence. The reflecting module is arranged behind the focusing module, so that the length of a follow-up module of the laser welding head can be shortened, the distance between the optical lens set and the to-be-welded position is effectively prolonged, the situation that the stability of the welding process is affected due to the fact that the optical lens set is damaged by welding spatter is avoided, and therefore laser beams can be inci