Welding device for steel structural member

The invention discloses a welding device for a steel structural member, and belongs to the field of steel structural welding.The welding device comprises a first supporting seat, a supporting rod is rotatably connected to the outer surface of the top of the first supporting seat, a fixing shell is fixedly mounted on the outer surface of the top end of the supporting rod, and a welding mechanism is arranged in the fixing shell; the welding mechanism is used for welding the spliced steel structural members, by arranging the welding mechanism, a transmission part is driven by a rotating motor to rotate, then a threaded rod is driven by the transmission part to rotate, then a welding part is driven to move under the action of a moving block, and the steel structural members are evenly welded through the welding part; and under the effect of constant-speed rotation of the rotating motor, constant-speed movement of a welding part is achieved, then the welding quality is improved, and the problems that the labor int