Brazing process of turbine stator blade of gas turbine

Abstract

The invention discloses a brazing process of a turbine stator blade of a gas turbine. The whole surface of the stator blade is cleaned to ensure that the surface is clean, and then, the stator blade is brazed. The brazing process comprises the following steps: flaw detection is conducted on the turbine stator blade of the gas turbine through FPI, detected penetrating cracks are repaired through argon arc welding, detected non-penetrating fine cracks are removed through grinding, and a to-be-brazed area is formed after repairing and grinding; a plurality of square lattices in the to-be-brazed area are fully coated with a brazing material, and the height of the brazing material is larger than the height of a welding seam formed by 0.5mm argon arc build-up welding; the coated blade is put into a vacuum furnace, the vacuum furnace is heated to a certain temperature and then slowly cooled, and the blade is taken out after the furnace body is cooled; the area higher than the blade is removedby grinding, and flaw detection is carried out on the welding area by using FPI; and the area with insufficient plate thickness or more fine cracks is repeatedly brazed, and thus, a brazing process is finished.

Description

technical field [0001] The invention relates to the field of brazing of stator blades, in particular to a brazing process for turbine stator blades of gas turbines. Background technique [0002] Brazing refers to a welding method in which the solder below the melting point of the weldment and the weldment are heated to the melting temperature of the solder at the same time, and then the gaps in the solid workpiece are filled with liquid solder to connect the metals. When brazing, the oxide film and oil stain on the contact surface of the base metal should be removed first, so as to facilitate the function of the capillary after the solder is melted, and increase the wettability and capillary fluidity of the solder. According to the melting point of the solder, brazing is divided into hard brazing and soft brazing; the brazing deformation is small, the joint is smooth and beautiful, and it is suitable for welding precision, complex and components composed of different materia...

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: the purpose of the invention is to solve the deficiencies in the prior art, providing a kind of brazing process of gas turbine turbine vane blade, the gas turbine turbine vane blade surface is a complex curved surface, and the position to be brazed is after being packed into a vacuum furnace In the vertical or inclined state, the method of welding small squares on the surface of the vane to be brazed by argon arc welding can prevent the solder from flowing after the parts are brazed in a vacuum furnace; and the argon The weld seam height of arc welding can be used as a reference for the height of solder coating. In the area where wall thickness repair is required, use a solder with a melting point of 1300-1400°C and another solder with a melting point of 1120-1150°C The solder is mixed according to the ratio of 1:1, put in as little glue as possible, put in acetone to make a suitable viscosity, and make it into a solder paste to improve production efficiency

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