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Gradient solder layer preparation and integrated brazing process based on laser fused deposition additive manufacturing technology

An additive manufacturing and laser melting technology, applied in the field of welding, to avoid joint cracking and deformation, improve efficiency, and improve service performance.

Active Publication Date: 2021-07-30
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the brazing of aluminum alloy, stainless steel, titanium alloy and other complex structural heat exchange parts and the same / dissimilar metal materials manufactured based on laser selective melting technology, and designs and invents a high-temperature and medium-temperature step brazing based on laser fusion deposition additive manufacturing technology Welded gradient solder layer to meet the needs of temperature gradient brazing and make up for the shortcomings of the existing process

Method used

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  • Gradient solder layer preparation and integrated brazing process based on laser fused deposition additive manufacturing technology
  • Gradient solder layer preparation and integrated brazing process based on laser fused deposition additive manufacturing technology
  • Gradient solder layer preparation and integrated brazing process based on laser fused deposition additive manufacturing technology

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Effect test

Embodiment 1

[0040] A preparation method based on a temperature gradient solder layer and an integrated process for vacuum brazing and heat treatment of 6-series aluminum alloys aimed at laser selective melting manufacturing technology, the specific steps are as follows:

[0041] Step 1, the 6-series aluminum alloy manufactured by laser selective melting and additive manufacturing, after fine cutting and polishing, the surface to be brazed with a surface roughness of 6.3 is used as a substrate, and placed on the laser fusion deposition additive manufacturing equipment table;

[0042] Step 2, use the mass fraction of Si: 10.0%, Mg: 0.60%, Fe: 2.0%, Al: the balance of AlSi10Mg alloy melt gas atomization to obtain pre-alloyed powder with a particle size of 50 μm, under the protection of argon atmosphere, use laser Fused deposition additive manufacturing technology, fixed laser power fixed laser power 650W, scanning speed 6m min -1 , the scanning distance is 90 μm, the phase angle is 90°, the ...

Embodiment 2

[0050] A method for preparing a solder layer based on a temperature gradient and an integrated process for austenitic stainless steel vacuum brazing and heat treatment for laser selective melting manufacturing technology, the specific steps are as follows:

[0051] Step 1, the austenitic stainless steel manufactured by laser selective melting and additive manufacturing, after fine cutting and polishing, the surface to be brazed with a surface roughness of 6.3 is used as a substrate, and placed on the laser fusion deposition additive manufacturing equipment table;

[0052] Step 2, using the mass fraction of Cr: 11%, Fe: 4.2%, B: 2.8%, Si: 5%, C: 0.03%, Ni: the balance of B-Ni2 nickel-based alloy melt gas atomization to obtain Pre-alloyed powder with a particle size of 50 μm, under the protection of argon atmosphere, using laser fusion deposition additive manufacturing technology, the power parameters used are: laser power 1100W, scanning speed 10m min -1 , the scanning distance...

Embodiment 3

[0060] A preparation method based on a temperature gradient solder layer and a Ti-6Al-4V titanium alloy vacuum brazing and heat treatment integrated process for laser selective melting manufacturing technology, the specific steps are as follows:

[0061] Step 1: For the Ti-6Al-4V titanium alloy manufactured by laser selective melting and additive manufacturing, after fine cutting and polishing, the surface to be brazed with a surface roughness of 6.3 is achieved, as a substrate, and placed on the laser fusion deposition additive manufacturing equipment table ;

[0062] Step 2, use the pre-alloyed powder with a particle size of 50 μm obtained after gas atomization of the Ti-Cu-Ni alloy melt with a mass fraction of Ti: 65%, Cu: 12%, and Ni: the balance, and use a laser under the protection of an argon atmosphere to Fused deposition additive manufacturing technology, the power parameters used are: laser power 1000W, scanning speed 10m min -1 , the scanning distance is 90 μm, the...

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Abstract

The present invention provides a gradient solder layer preparation and an integrated brazing process based on laser fusion deposition additive manufacturing technology, aiming at the brazing process of the same / dissimilar metal materials of complex structure heat exchange parts manufactured based on laser selective melting technology. Due to the lack of technology, a gradient solder layer based on laser fusion deposition additive manufacturing technology was designed and invented to meet high temperature and medium temperature gradient brazing. The multi-level brazing seam with a single melting temperature is replaced by gradient solder layers with different melting temperatures, which reduces the melting point of the solder and improves the brazing quality. Aiming at the problems of large residual stress and low elongation of metal parts manufactured by laser selective melting and additive technology, the present invention is suitable for combining metal parts manufactured by laser selective melting and additive with the same / different kind by traditional processing techniques (casting, forging or extrusion) Pressing, etc.) The metal parts manufactured by welding are formed at one time, and heat treatment is realized at the same time, the residual stress is eliminated, the weld shape is improved, the component performance is improved, the production efficiency is improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a gradient solder layer based on laser fusion deposition additive manufacturing technology and a corresponding integrated brazing process. Background technique [0002] In the modern microelectronics and communication industries, in order to achieve higher assembly density and corresponding heat dissipation requirements, the development of high-frequency devices such as signal transmitters and high-precision liquid cooling plates and their corresponding heat dissipation components has the characteristics of miniaturization, integration and light weight. quantitative trends. Therefore, brazing joints are becoming more and more complicated and precise, and must meet the requirements of thermal strength, temperature shock and other performance. Therefore, the technological process of welding each heat dissipation component first, and then reassembling and integral braz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B22F1/00B22F3/24B22F7/04C22C5/06C22C5/08C22C14/00C22C19/05C22C21/02C22C9/00
CPCB22F1/0003B22F3/24B22F7/04C22C21/02C22C19/056C22C14/00C22C5/08C22C5/06C22C9/00B22F2003/248B22F2207/01B22F10/00B22F10/66B22F10/34B22F10/366B22F10/25B22F10/36B22F10/64B22F10/28B22F10/32Y02P10/25
Inventor 李红韩祎栗卓新刘璇
Owner BEIJING UNIV OF TECH
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