Positioning device for assembling and welding pressure tank

The utility model discloses a positioning device for pressure tank assembly welding, which relates to the technical field of pressure tank welding and comprises a bottom plate, a front end supporting block is arranged at the front end of the bottom plate, a stand column is arranged behind the bottom plate, rear end limiting seats are arranged on the left side and the right side of the stand column, a supporting plate is arranged above the stand column, and positioning mechanisms are distributed on the supporting plate. A positioning mechanism is arranged below the stand column in a penetrating mode and comprises a positioning supporting pipe, a handle and a positioning pipe. The semi-automatic welding device is very convenient to use, the front side and the rear side of the pressure tank body are limited and supported through the limiting cambered surface and the supporting cambered surface, then a connector and a support which need to be assembled are fixed through the positioning mechanism, five handles are