Welding tool and welding production line

The utility model discloses a welding tool and a welding production line, the welding tool can be suitable for welding of a frame cross beam, the welding tool comprises a mounting bracket, a mounting body and a locking mechanism, the mounting body is rotatably supported on the mounting bracket, the rotating axial direction is parallel to the axial direction of a cross beam assembly to be welded, a positioning clamping mechanism is fixed on the mounting body, and the locking mechanism is fixed on the mounting body. The positioning and clamping mechanism is used for positioning and locking the cross beam assembly to be welded on the mounting body; the locking mechanism is used for locking or unlocking the relative rotation position of the mounting body and the mounting bracket; according to the welding tool, the cross beam assembly can be rapidly and accurately positioned and installed on the installation body through the positioning and clamping mechanism, the installation body can rotate relative to the insta