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A tial/tc4 electron beam melting and brazing method with an alloy intermediate layer added

An electron beam welding and intermediate layer technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of material cracking, increasing cracking tendency, reducing joint plasticity, etc., so as to improve crack resistance and optimize mechanical properties. , the effect of improving the strength of the joint

Active Publication Date: 2017-03-15
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for the brittle material TiAl, after the welding melting-solidification process, the microstructure in the weld changes from a microstructure with good plasticity to a brittle supersaturated Ti 3 Al phase, the supersaturated phase has a large internal stress of the structure, and the structure is very brittle, which greatly reduces the plasticity of the joint and increases the tendency of cracking
In addition, during the welding process, due to the concentration of electron beam welding energy, the cooling rate is significantly higher than other welding methods. The increase in cooling rate will increase the residual tensile stress at the weld position. In the welding process of brittle materials, the residual stress The increase of will cause the material to crack and form cracks, so in the process of electron beam welding brittle materials, how to eliminate cracks is a problem that must be studied

Method used

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  • A tial/tc4 electron beam melting and brazing method with an alloy intermediate layer added
  • A tial/tc4 electron beam melting and brazing method with an alloy intermediate layer added

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) The base metal to be welded is cleaned before welding, and the oil stain and oxide layer on the surface of the material are removed by physical and chemical methods. The base metal is TiAl and TC4 plate, and the thickness of the plate is 1.5mm.

[0039] (2), prepare the intermediate layer alloy by wire cutting, the intermediate layer alloy elements Nb, Ni, the Nb foil is 1 layer, and the Ni foil is 1 layer. The foil is spot welded and positioned by a spot welding machine, and then the intermediate layer Spot welding to the welding surface of TC4 base metal; the thickness of each layer of Nb foil is 100 μm, and the thickness of each layer of Ni foil is 100 μm.

[0040] (3) Fix the workpiece with a fixture to ensure the tight connection between TC4 and TiAl;

[0041] (4) Put the workpiece into the vacuum chamber of the electron beam welding machine and start vacuuming;

[0042] (5), when the vacuum degree reaches 5×10 -2 Pa, adjust the electron beam welding process ...

Embodiment 2

[0046] (1) The base metal to be welded is cleaned before welding, and the oil stain and oxide layer on the surface of the material are removed by physical and chemical methods. The base metal is TiAl and TC4 plate, and the thickness of the plate is 1.5mm.

[0047] (2) Prepare the intermediate layer alloy by wire cutting, the intermediate layer alloy elements Nb, Ni, the Nb foil is 2 layers, and the Ni foil is 1 layer. Use a spot welding machine to spot weld the foil and then spot weld the intermediate layer To the welding surface of TC4 base metal; the thickness of each layer of Nb foil is 100 μm, and the thickness of each layer of Ni foil is 100 μm.

[0048] (3) Fix the workpiece with a fixture to ensure the tight connection between TC4 and TiAl;

[0049] (4) Put the workpiece into the vacuum chamber of the electron beam welding machine and start vacuuming;

[0050] (5), when the vacuum degree reaches 5×10 -2 Pa, adjust the electron beam welding process parameters to prepar...

Embodiment 3

[0054] (1) The base material to be welded is cleaned before welding, and the oil stain and oxide layer on the surface of the material are removed by physical and chemical methods. The base material is TiAl and TC4 ring, with a thickness of 2mm.

[0055] (2) Prepare the intermediate layer alloy by wire cutting, the intermediate layer alloy elements Nb, Ni, the Nb foil is 2 layers, and the Ni foil is 1 layer. Use a spot welding machine to spot weld the foil and then spot weld the intermediate layer To the welding surface of TC4 base metal; the thickness of each layer of Nb foil is 100 μm, and the thickness of each layer of Ni foil is 100 μm.

[0056] (3) Fix the workpiece with a fixture to ensure the tight connection between TC4 and TiAl;

[0057] (4) Put the workpiece into the vacuum chamber of the electron beam welding machine and start vacuuming;

[0058] (5), when the vacuum degree reaches 5×10 -2 Pa, adjust the electron beam welding process parameters to prepare for weldi...

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Abstract

The invention relates to a TiAl / TC4 electronic-beam melting-brazing method with addition of an alloy middle layer. The TiAl / TC4 electronic-beam melting-brazing method comprises the following steps: presetting the middle metal layer consisting of Ni and Nb at the positions of welding seams by TiAl / TC4 electronic beams; and obtaining a high-strength and no-crack TiAl / TC4 electronic-beam welding joint by selecting reasonable middle-layer components, the middle-layer distribution mode, the middle-layer thickness and electronic-beam welding process parameters. In addition, the TiAl / TC4 electronic-beam melting-brazing method is short in welding process flow, simple in operation and easy in implementation and has strong practicability.

Description

technical field [0001] The invention relates to a TiAl / TC4 electron beam melting and brazing method with an alloy intermediate layer added, belonging to the field of brittle material welding. Background technique [0002] In the aerospace industry, the structural service conditions are harsh, and they often work in harsh environments such as high temperature, heat resistance, corrosion, and low temperature, so there are high requirements for the performance of materials. In addition, strict restrictions on the weight of the structure put forward higher requirements for the lightweight of materials. Therefore, TiAl, a new material with light weight, high strength, high specific modulus, and high specific strength, has been widely used in the aerospace field. Cracks occur, which greatly limits its popularization and application. [0003] The electron beam welding process carried out in a vacuum environment eliminates the harm of harmful impurities in the air to the weld and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/00
CPCB23K1/005B23K1/0056B23K1/20
Inventor 康黎胡太文张俊杰戎磊赵青蒋元清沈江红刘志华
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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