Welding process for titanium alloy workpiece

Abstract

The invention discloses a welding process of a titanium alloy workpiece, which comprises the following steps: pre-treating the surface of a titanium alloy, combining and fixing with other workpieces to be welded, putting into a vacuum heat treatment furnace, heating to 900-950 DEG C along with the furnace in a three-section heating manner, preserving heat, and cooling along with the furnace to obtain the titanium alloy workpiece. The three-stage heating mode comprises the following steps: heating to 400-450 DEG C along with a furnace, preserving heat for 10-20 minutes, heating to 700-800 DEG C at a heating rate of 5-15 DEG C / min, preserving heat for 30-40 minutes, continuously heating to 900-950 DEG C at a heating rate of 5 DEG C / min, preserving heat for 30-40 minutes, and cooling along with the furnace. The titanium alloy workpiece has good tensile strength; the welding technology is simple and convenient, the production efficiency is high, meanwhile, alloy strength reduction caused by a traditional common annealing technology can be effectively avoided, and good application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of alloy preparation, and particularly relates to a welding process for titanium alloy parts. Background technique [0002] Titanium alloys are alloys based on titanium with other elements added. Titanium and titanium alloys are a very important structural metal that emerged in the 1950s. Compared with other structural metals, it has a series of outstanding advantages. The first is that the specific gravity of titanium is small and the specific strength is high. The specific gravity of titanium is 4.5, which is between aluminum (2.7) and iron (7.6), but the specific strength is higher than that of aluminum and iron. The heat resistance of titanium alloys is also much higher than that of aluminum and magnesium alloys. For example, at 300°C to 350°C, the strength of titanium alloys is about one grade higher than that of aluminum and magnesium alloys, while at 400°C to 500°C, aluminum and magnesium alloys l...

AI Technical Summary

Problems solved by technology

Solution aging is mainly used for heat treatment of small-sized bars, and is not suitable for post-weld heat treatment of welded parts. It is easy to cause serious deformation of parts. The titanium alloy obtained after complex double annealing has better tensile strength, but the disadvantage of this process is that it is too It is complex and requires two vacuum heat treatments, among which rapid air cooling is required after heat preservation at 740-760°C, and a large-scale vacuum air quenching heat treatment furnace is required to achieve the required cooling speed; the main disadvantage of the ordinary annealing process is the low tensile strength of the matrix, and The requirement on the cooling rate is too strict (3-5°C / min), while the cooling rate of the vacuum heat treatment furnace in the factory is generally 0.5-3°C / min

[0005] Therefore, there is an urgent need to develop a titanium alloy welding process that is simple in process, high in production efficiency, and can effectively avoid the reduction of alloy strength caused by traditional ordinary annealing processes.

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