Steel rail induction friction composite welding device and welding method

According to the steel rail induction friction composite welding device and method, the far ends of two to-be-welded steel rails are clamped and fixed through a fixed end clamping mechanism and a movable end clamping mechanism, and the two to-be-welded surfaces of the two to-be-welded steel rails are matched and aligned under the action of a vibration clamping mechanism and a friction vibrator; the two to-be-welded faces are heated through the induction heating coil, after the two to-be-welded faces are both heated to the target temperature, the friction vibrator starts to vibrate, and after the amplitude and the frequency are stable, the two to-be-welded faces are tightly jacked through the upsetting mechanism for vibration friction, so that grains in a friction area are refined, more eutectic structures are formed, and the welding quality is improved. When the grain refinement degree and the eutectic number both meet the preset requirements, friction vibration is stopped, and upsetting force is applied thro