Electron beam welding method for thin-walled high-temperature titanium alloy castings

Abstract

Disclosed is a welding method for a high-temperature titanium alloy thin-wall casting electron beam. High-temperature titanium alloy is preheated, subjected to heat preservation and then welded. A weld joint can obtain high energy through preheating before welding. A molten pool can be pushed forwards continuously during welding, so that the shape of the weld joint is beautiful. In addition, the area scanned by preheating before welding is larger than that obtained during welding, thus the structure of a weldment weak link, namely a heat affected zone, is heated, the temperature gradient of the weld joint and the heat affected zone is reduced, thus the structure in the heat affected zone can achieve smooth transition, and the influence caused by incoordinate deformation is weakened. For a thick weldment, the condition of incomplete melting of the weld joint can be avoided through preheating before welding. The area scanned by postweld heat treatment is the same as that of preheating before welding, the cooling rate of the weld joint and part of the heat affected zone is lowered, many acicular martensite and widmannstatten structures are prevented from being generated, and the quality of the weld joint is improved obviously.

Description

technical field [0001] The invention belongs to the technical field of processing titanium alloy materials, and in particular relates to an electron beam welding method for high-temperature titanium alloy thin-walled castings. Background technique [0002] Most high-temperature titanium alloys are near-α-type alloys, which have good high-temperature performance, structural stability and welding performance. As one of the key materials for aerospace vehicles, the addition of high-temperature titanium alloys can reduce the weight of the body and increase the thrust-to-weight ratio. In view of the large, complex and thin-walled titanium alloy structural parts for aerospace and the increasingly urgent demand for high-temperature titanium alloys for high-speed aircraft structural parts, integrated forming components have become the key to the development of high-speed aircraft. Due to the complexity and difficulty of forming, it is often necessary to connect key parts by means o...

AI Technical Summary

Problems solved by technology

Aiming at the problems of poor weld formation after electron beam welding of titanium alloys, porosity and cracking tendency in the joints, it is an important topic for scientific research and production personnel to explore a simple and efficient method to improve the efficiency of electron beam welding of titanium alloys.

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