Control system and method of special welding machines for multiple-unit trains

The invention discloses a control system and method of special welding machines for multiple-unit trains. The control system comprises a PLC control box, a software control program and the plurality of special welding machines, wherein the PLC control box comprises a controller, a touch screen and a plurality of servo motors; the controller is used for programming control; the touch screen is usedfor receiving different operation signals; the servo motors are connected to the controller and the touch screen to accomplish energy supply; the software control program is arranged in the controller of the PLC control box so as to input a corresponding operation program; and the controller is used for controlling the special welding machines to accomplish the welding operation. Welding spot records can be recorded and permanently stored. The welding pressure is compared with the running speed in real time, so that the welding quality is guaranteed. Whole-process automatic welding can be achieved, so that the workin