Post weld vacuum heat treatment process of TC18 titanium alloy welding component

The invention relates to a post weld vacuum heat treatment process of TC18 titanium alloy welding component. The method comprises the following steps of: (1) placing a clean high-intensity TC18 titanium alloy welding component and a furnace test sample into a vacuum heat treatment furnace, wherein the vacuum working pressure in the vacuum chamber is not greater than 6.7*10-2Pa; (2) heating the welding component with the temperature of the furnace to 810-850 DEC G via a step temperature increasing method, and maintaining the temperature for 1-2h; (3) cooling the TC18 titanium alloy welding component and the furnace test sample below 300 DEC G at the cooling speed of 0.3-5 DEG G/min, and taking the component and the sample out of the furnace to cool via air; and (4) carrying out the heat treatment on the component, and carrying out the tension performance test on the furnace test sample for testing the tension performances of the welding component substrate and the welding joint. The intensity of the component acquired by adopting the process can reach above 1030MPa required by the design index. The post weld vacuum heat treatment process has simple process, high production efficiency and can effectively avoid the alloy intensity reduction caused by the conventional annealing process at the same time.