Method for evaluating repair welding performance of complex thin-wall high-temperature alloy casting

The invention provides a method for evaluating the repair welding performance of a complex thin-wall high-temperature alloy casting. The method comprises the steps of: designing a thin-plate-shaped casting and/or a variable-cross-section step-shaped casting; simulating the casting defects by machining round holes in the thin-plate-shaped casting and/or the variable-cross-section step-shaped casting; performing repair welding on the circular holes of the thin-plate-shaped casting and/or the variable-cross-section step-shaped casting; detecting the macroscopic quality condition of the sheet-shaped casting and/or the variable cross-section step-shaped casting after repair welding; selecting the sheet-shaped casting and/or the variable cross-section step-shaped casting meeting the technical requirements, and carrying out mechanical property test and microstructure analysis to obtain mechanical property data and microstructure evolution data of the casting after repair welding; performing multiple times of repair