Diffusion welding process method for combustion chamber structure member made of Ti2AlNb alloy

Abstract

The invention discloses a diffusion welding process method for a combustion chamber structure member made of Ti2AlNb alloy, successfully solves the problem of welding of a large-size Ti2AlNb structure, and provides a better solving way for a large-size hard-to-weld material. According to the method, the connection surfaces between a first blank part and a second blank part and between the second blank part and a third blank part are positioned by adopting two positioning rings, so that the problem of inaccurate butting in the process of welding the structure member can be effectively avoided; bosses are processed on the connection surfaces of the three blank parts, so that the influence on the shape of the combustion chamber structure member due to larger-range collapse caused by intense pressure in the process of welding the combustion chamber structure member is avoided; in addition, the processed bosses can be also used for enhancing the welding strength; and a bearing column is arranged in the center of the structure member, and a supporting column is arranged on the edge of the lower end surface of the second blank part, so that the possibility of collapse of the structure member caused by larger pressure intensity on the upper end surface of the first blank part in the diffusion welding process can be avoided.

Description

technical field [0001] The invention relates to the technical field of welding technology, in particular to a Ti 2 The invention discloses a diffusion welding process method of a combustion chamber structure made of AlNb alloy material. Background technique [0002] In the process of product processing and manufacturing, welding different parts is a common process method to ensure the strength and design structure. For most materials, welding can be accomplished by fusion welding techniques. Such as figure 1 As shown in , it is a structural schematic diagram of an important load-bearing structural part of a certain type of aerospace engine combustion chamber. Due to the large size of the structural part, Ti 2 It is made of AlNb alloy, which is not suitable for processing by traditional methods. Therefore, in actual engineering realization, it is usually considered to divide the structural part into several parts, and weld each part after processing. In the process of prod...

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Problems solved by technology

Ti 2 AlNb intermetallic compounds have the advantages of high specific strength, room temperature plasticity, fracture toughness and creep resistance, good oxidation resistance, and non-magnetism, but their microstructure and mechanical properties are sensitive to welding processing, and are not suitable for welding. The heating and cooling speed requirements of the process are strict, the welding parameter range is relatively narrow, and the structure of the weld seam and heat-affected zone is complex. If the traditional fusion welding technology is used, defects such as cracks and pores are prone to occur

Especially for Ti 2 Large-scale structural parts of AlNb intermetallic compounds, lack of relevant engineering experience at present, resulting in substandard weld quality of structural parts, making it difficult to use normally

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