Welding device for steel structure building construction and welding method thereof

The invention relates to the technical field of steel structures, and discloses a welding device for steel structure building construction and a welding method thereof.The welding device comprises a welding table, a protection mechanism is arranged at the top of the welding table, the protection mechanism comprises a flat groove formed in the top of the welding table, and a filter plate is fixedly mounted in the flat groove; and an air suction cover is fixedly mounted on the inner wall of the top of the welding table. Carbon monoxide entering the water tank can be dissolved in water, so that the carbon monoxide is subjected to water treatment, after gas is continuously discharged into the water tank, the gas insoluble in the water can increase the air pressure in the water tank, the rotating threaded rod is reversely rotated after welding is completed, and under the elastic pushing of the adaptive spring, the pressurizing plate can reach the thread of the rotating threaded rod, so that the gas pressure in the