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Electron beam weld joint micro-crack control method for Ti2AlNb material

A technology of electron beam welding seam and control method, which is applied in electron beam welding equipment, welding equipment, manufacturing tools, etc., can solve the problem of cracks that cannot be welded, and achieves high machining cost, expanded application scope, and reliable electron beam welding seam. effect of connection

Active Publication Date: 2020-12-18
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Aiming at the deficiencies of the prior art, the present invention proposes a microcrack control method for electron beam welds of Ti2AlNb material, which solves the problem of Ti2AlNb 2 A1Nb material will cause cracks and cannot be welded by conventional fusion welding methods, and Ti 2 The welding connection of A1Nb material provides technical support for the application of electron beam welding process of parts of this material

Method used

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  • Electron beam weld joint micro-crack control method for Ti2AlNb material
  • Electron beam weld joint micro-crack control method for Ti2AlNb material
  • Electron beam weld joint micro-crack control method for Ti2AlNb material

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Embodiment 1

[0032] The object of welding in this embodiment is two Ti 2 For parts of AlNb material, the welding surface is flat. The welding process steps are as follows:

[0033] Step 1: Weld cleaning

[0034] Clean Ti with a scraper or wire wheel 2 AlNb welding surface and joint surface, expose the fresh surface, and then use a white cloth to dip alcohol or acetone to clean the welding joint to ensure that there is no dirt, impurities or other oxides. After cleaning, the weld should be welded within 120 hours.

[0035] Step 2: Soldering Assembly

[0036] For Ti to be welded 2 AlNb parts are welded and assembled to ensure that the maximum fit gap of the weld seam is ≤0.1m and the maximum misalignment is ≤0.5mn.

[0037] Step 3: Weld Preheating

[0038] The electron beam defocusing method is used to scan and preheat the electron beam weld. The parameters are shown in Table 1. The temperature before welding is increased, and the temperature gradient and stress during the weld heating...

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Abstract

The invention belongs to the field of welding of intermetallic compounds, and particularly relates to an electron beam weld joint micro-crack control method for an intermetallic compound Ti2AlNb material. In order to solve the problems that a Ti2A1Nb material is low in plasticity, large in brittleness, poor in weldability, prone to generating micro-cracks and the like, according to the property and the reason of crack generation, in combination with the characteristics of an electron beam welding process, key parameters such as reasonable welding speed and current are determined, a reasonableelectron beam preheating and slow cooling process and a reasonable post-welding stepped heat treatment process are designed, and control over electron beam weld joint cracks is achieved. According tothe method, reliable electron beam weld joint connection of a Ti2AlNb structural part can be achieved, the manufacturing difficulty, cost and weight are reduced, the performance of parts is improved,the room temperature and high temperature performance of a weld joint reaches 90% or above of that of a base material, the quality can meet the standard I-level weld joint requirement, and the application range of Ti2AlNb in the aerospace field is widened.

Description

technical field [0001] The invention belongs to the field of intermetallic compound welding, in particular to an intermetallic compound Ti 2 Electron beam weld microcrack control method for AlNb material. Background technique [0002] Ti 2 AlNb material, as an intermetallic compound, is one of the options to replace nickel-based superalloys. Its excellent comprehensive mechanical properties meet the urgent needs of future aero-engines for lightweight superalloy structural materials with high specific strength and high stiffness. It is of great significance to reduce the self-weight of the engine and improve the structural efficiency, thrust-to-weight ratio and high-temperature service performance of the engine. Its goal is to replace the GH4169 alloy, which can achieve about 35% weight reduction. It is a new type of high-temperature light-weight material that is urgently needed for the new generation of aero-engines . [0003] However, Ti 2 A1Nb alloy has low plasticity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/00
CPCB23K15/0053B23K15/0033
Inventor 葛沁赵伟刘海强方建明赵强
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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