The invention discloses a steel structure plate
butt welding device and a working method thereof. The steel structure plate
butt welding device comprises a bottom plate, a top plate and lateral supports on the two sides. A clamping
assembly used for clamping a steel structure plate is arranged on the lateral support, the
welding assembly comprises a
welding gun, a motor, a third lead screw, a sliding block and an electric push rod, and front-back movement and height adjustment of the
welding gun are achieved; the driving
assembly comprises a gear, a rotating rod, a
rotating disc and a rack, and
vertical displacement of the clamping assembly is achieved through gear and rack transmission. A positioning device is further arranged on the rack, comprises a second lead screw and an internal thread knob and is used for finely adjusting and locking the position of the clamping assembly. Coarse adjustment is achieved through the driving assembly, fine adjustment is achieved through the positioning device, the tops of the two plates with different thicknesses are adjusted to the same horizontal plane, it is ensured that welding faces are aligned, the problems that in the prior art, the welding faces are uneven and the welding seam quality is poor due to the plate thickness difference are solved, and the beneficial effects of being convenient and fast to operate, high in welding precision and high in adaptability are achieved.