Positioning fastening device for steam turbine medium-pressure control valve operation seat bracket welding

The utility model provides a positioning fastening device for steam turbine medium-pressure control valve operation seat bracket welding, and relates to a positioning fastening device, in particular to the positioning fastening device for the steam turbine medium-pressure control valve operation seat bracket welding. In order to solve the problems that during the existing steam turbine medium-pressure control valve operation seat bracket welding, a welding position of a circular arc plate and a T-shaped plate is manually found, the positioning accuracy is poor, and the welding position precision is low. The positioning fastening device is characterized in that a threaded hole is formed in the center part of a perforation plate in the thickness direction of the perforation plate, a screw bolt is arranged in the threaded hole, each second baffle plate is integrally made of one straight plate and one arc-shaped plate, the two second baffle plates are symmetrically arranged at the two sides of the screw bolt along a center line in the length direction of the screw bolt, the inner arc surfaces of the two arc plates are in opposite arrangement, and a third baffle plate is arranged between a first baffle plate and the second baffle plates. The positioning fastening device is used for the steam turbine medium-pressure control valve operation seat bracket welding.