Pressure vessel girth welding device

The utility model relates to the field of welding, in particular to a pressure vessel girth welding device which comprises a workbench, two fixing rings are rotationally connected to the workbench and coaxially arranged, and a plurality of abutting air cylinders are connected to the inner side walls of the fixing rings; the abutting air cylinders are circumferentially arranged on the fixing rings with the axes of the fixing rings as the center, the workbench is connected with a first welding gun used for welding the outer side wall of the pressure container and a second welding gun used for welding the inner side wall of the pressure container, and the first welding gun is located between the two fixing rings. And the second welding gun is slidably connected with the workbench and penetrates through the first fixing ring and the second fixing ring, the first welding gun and the second welding gun are oppositely arranged, and the welding device has the effect of improving the welding efficiency. 本申请涉及焊接领域，尤其是涉