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Medium-temperature brazing method of dissimilar metals of titanium and aluminium under atmospheric condition

A technology of atmospheric conditions and dissimilar metals, applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve the problem that aluminum-based solder is difficult to wet titanium base material, etc., to promote wetting and spreading, easy operation, Simple to use effects

Inactive Publication Date: 2013-12-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a medium-temperature brazing method for titanium and aluminum dissimilar metals under atmospheric conditions, to solve the problem that the aluminum-based solder is difficult to wet the titanium base material in the ordinary brazing process, and to realize reliable brazing of titanium and aluminum dissimilar metals catch

Method used

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  • Medium-temperature brazing method of dissimilar metals of titanium and aluminium under atmospheric condition
  • Medium-temperature brazing method of dissimilar metals of titanium and aluminium under atmospheric condition
  • Medium-temperature brazing method of dissimilar metals of titanium and aluminium under atmospheric condition

Examples

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Embodiment 1

[0036] A kind of medium temperature brazing method under atmospheric conditions of titanium, aluminum dissimilar metals, it comprises the following steps:

[0037] (1) Hot-dip aluminum plating

[0038] Cut the pure aluminum welding wire that has been wiped with acetone to remove oil stains into small pieces and put it into the graphite crucible 2, put the graphite crucible 2 into a furnace with a heating wire 4 and heat it to 700°C to melt the pure aluminum welding wire, and keep it warm for more than half an hour to ensure The temperature of molten aluminum 3 is homogenized. Clean the end of the connected titanium plate 1 with sandpaper and wash with acetone to remove the oxide film and oil. Dissolve NOCOLOK brazing flux in acetone to form a suspension, and brush it on the front and back surfaces with a width of 10 mm at the end of the titanium plate 1 . After the acetone is volatilized, the titanium plate 1 on the side coated with the flux is vertically immersed in the alu...

Embodiment 2

[0044] A kind of medium temperature brazing method under atmospheric conditions of titanium, aluminum dissimilar metals, it comprises the following steps:

[0045] (1) Hot-dip aluminum plating

[0046] Cut the pure aluminum welding wire that has been wiped with acetone to remove oil stains into small pieces and put it into the graphite crucible 2, put the graphite crucible 2 into a furnace with a heating wire 4 and heat it to 750°C to melt the pure aluminum welding wire, and keep it warm for more than half an hour to ensure The temperature of molten aluminum 3 is homogenized. Clean the end of the connected titanium plate 1 with sandpaper and wash with acetone to remove the oxide film and oil. Dissolve NOCOLOK brazing flux in acetone to form a suspension, and brush it on the front and back surfaces with a width of 20 mm at the end of the titanium plate 1 . After the acetone is volatilized, the titanium plate 1 on the side coated with the flux is vertically immersed in the alu...

Embodiment 3

[0052] The base material is 50mm×40mm×2mm TC4 titanium alloy plate and LF6 anti-rust aluminum plate. Cut the cleaned pure aluminum welding wire into small pieces and put them into a graphite crucible. Put the crucible into an electric furnace and heat it to 750°C. Keep it warm for one hour to make the aluminum Homogenize the liquid temperature. Dissolve chloride, fluoride mixed flux or NOCOLOK flux in acetone to make a suspension, and then apply it to the front and back sides within 15mm of the edge of the titanium plate. After air-drying, immerse the flux-coated side of the titanium plate vertically In the molten aluminum, after dipping for 1 min, the titanium plate is pulled out at a constant speed of 2 cm / s, and cooled naturally. Evenly scrape and clad the zinc-aluminum solder on the end of the aluminum plate and the surface of the TC4 aluminum coating, and assemble the aluminum plate and the TC4 plate after cladding the zinc-aluminum solder into a lap joint, the lap length...

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Abstract

The invention provides a medium-temperature brazing method of dissimilar metals of titanium and aluminium under the atmospheric condition. The medium-temperature brazing method comprises the following key points of: before brazing, firstly carrying out hot-dip aluminum plating on a titanium plate, forming an aluminium-plating layer with certain thickness on the surface of the titanium plate, then preparing a zinc-aluminium brazing material melting layer on the surfaces of the aluminium-plating layer of the aluminium plate and the titanium plate by a mechanical scratching and melting method, and then carrying brazing connection. The medium-temperature brazing method provided by the invention has the advantages that oxidation films are removed by mechanical scratching, so that the zinc-aluminium brazing materials can be wet and spread on the surfaces of the aluminium-plating layers of the aluminium plate and the titanium plate to form uniform melting, and brazing materials do not need to be added in the following brazing process; due to lower brazing temperature, a large amount of titanium-aluminium friable intermetallic compounds on the interface can be limited from generating to a certain extent, and further the toughness of joints is improved; the medium-temperature brazing method is simple and easy in operation, can be carried out under the atmospheric condition, does not need special atmosphere for protection and is suitable for practical engineering application.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to a medium-temperature brazing method for titanium and aluminum dissimilar metals under atmospheric conditions. Background technique [0002] As lightweight and high-strength materials, titanium alloys and aluminum alloys have been widely used in the fields of aviation, aerospace and automobiles. Titanium alloys have high specific strength, excellent low-temperature toughness, and good corrosion resistance, but their high cost severely limits the large-scale applications of titanium alloys. Aluminum alloy has good plasticity and toughness, light specific gravity, and compared with titanium alloy, aluminum alloy has obvious advantages in cost. However, aluminum alloy has poor strength and heat resistance, which also limits its further application. Titanium-aluminum dissimilar metal composite components can not only take into account the respective characteristics of the two metals,...

Claims

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Application Information

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IPC IPC(8): B23K1/20B23K1/19B23K1/002
Inventor 吕世雄徐永强黄永宪郑传奇崔庆龙李充
Owner HARBIN INST OF TECH
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