Automatic overturning and welding device for machining

The utility model provides an automatic overturning and welding device for machining. The automatic overturning and welding device for machining comprises a bottom plate, a welding assembly, a fixing plate, a rotating device, a rotating wheel and a rack. According to the automatic overturning welding device for machining, through mutual cooperation of the rotating rod, the threaded ring, the moving ring, the moving block and the clamping device, when the other face of a workpiece needs to be welded, a worker moves the welding gun upwards through the second electric telescopic cylinder, then the first electric telescopic cylinder is started, and the welding gun is turned on; a first telescopic cylinder drives a rack to move through a sliding plate, under the action of the rack, a rotating wheel rotates, the rotating wheel drives a rotating rod to rotate, and therefore turning-over work of the workpiece is completed, a worker can weld the other face of the workpiece conveniently, turning-over work of the workpi