Welding device for box column in steel structure

The invention discloses a welding device for a box column in a steel structure. The welding device comprises a clamping and positioning device and a bottom frame, the clamping and positioning device is configured to be a device capable of fixing the box-shaped column and increasing clamping pressure so that the side plate can be tightly attached to the transverse partition plate, the clamping and positioning device comprises a fixed part and a movable part, the fixed part is fixedly connected to the upper portion of the bottom frame, and the movable part is arranged on the upper portion of the bottom frame; the transverse displacement can be performed on the upper part of the bottom frame; the bottom frame comprises a sliding rail and a sliding block, and the sliding block is movably connected to the upper portion of the sliding rail through a sliding groove. The fourth side plate is clamped through the fixed part and the movable part, so that gaps between the fourth side plate and the other three side plates