Turbine guide blade welding positioning method

The invention belongs to the technical field of aero-engine production, and relates to a turbine guide vane welding and positioning method, which comprises the following steps: when welding and positioning turbine guide vanes, establishing a three-dimensional rectangular coordinate system, and measuring the minimum distance between two adjacent groups of vanes under equal cylindrical section radiuses; finding a theoretical measurement point corresponding to the minimum distance of the blade, finding a theoretical measurement point at the tail edge under the equal cylindrical section radius, finding an auxiliary positioning point corresponding to the theoretical measurement point, and completing theoretical calculation; when the blade is actually positioned and adjusted, the actual measurement point of the blade is found through the auxiliary positioning point, and then effective coordinate positioning and coordinate system checking can be carried out by comparing two distance difference values between the the