Alkali furnace header welding device

The utility model discloses an alkali furnace header welding device. The alkali furnace header welding device comprises a supporting table, two supports are arranged on the supporting table in a spaced mode, a pipe clamp is arranged at the top ends of the supports and used for clamping the end of a header barrel to be welded, and a jacking and stretching mechanism is arranged between the two supports and used for applying acting force to the header barrel clamped and fixed by the pipe clamp. And the header barrel generates pre-deformation for counteracting welding deformation. The header is subjected to arch-shaped pre-deformation in the direction opposite to the welding deformation direction through the jacking and stretching mechanism before welding, then welding is conducted, the pre-deformation can offset or compensate deformation generated after welding, and therefore the post-welding deformation amount is effectively reduced, the working efficiency is greatly improved, and the header welding quality is