The invention discloses an operation method of an automatic turnover
welding frame for the front and back sides of a three-wheeled motorcycle frame. The automatic turnover
welding frame comprises a bottom plate, a
welding flux tank, a balancing weight groove, a balancing weight, fixing plates, fixing holes, brackets, a first mounting frame, a turnover motor, a first turnover shaft, a distance sensor, a limiting block, a spring seat, a spring rod, a
cushion rubber block, a turnover
assembly, a second turnover shaft, a second mounting frame, a transmission bearing and a bearing seat, wherein brackets are arranged on the periphery of the top of the bottom plate through welding, the tops of the brackets are provided with the first mounting frame and the second mounting frame through bolts correspondingly, the turnover motor is arranged on one side of the top of the first mounting frame through a bolt, and the bearing seat is arranged in the center of the top of the second mounting frame through the bolt. The automatic turnover welding frame is simple to operate, firm in installation and fixation and good in supporting stability during welding; and the turnover of the turnover frame canbe limited, so that the welding effect is greatly improved.