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Method diffusion welding titanium alloy and copper alloy using niobium central layer

A diffusion welding and titanium alloy technology, applied in the field of welding metal titanium alloy and copper alloy, can solve the problems of reducing the plasticity and toughness of welded joints, low mutual solubility, cracking of weldments, etc., to improve toughness and bonding strength, and improve joint strength , the effect of reducing joint deformation

Inactive Publication Date: 2008-09-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The miscibility between titanium and copper is small, and it is easy to form a variety of brittle intermetallic compounds, which increases the brittleness of the joint; both titanium and copper have strong hydrogen absorption capacity at high temperature, and are prone to produce brittle hydrides, which will significantly reduce the plasticity of the welded joint. Toughness; the difference in thermal expansion coefficient between titanium and copper is nearly double, and large stress will be generated during welding, and the weldment obtained is extremely prone to cracking; both titanium and copper are easily oxidized, and the oxide film will weaken the interface between titanium and copper binding ability

Method used

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  • Method diffusion welding titanium alloy and copper alloy using niobium central layer
  • Method diffusion welding titanium alloy and copper alloy using niobium central layer
  • Method diffusion welding titanium alloy and copper alloy using niobium central layer

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Embodiment 1

[0021] Embodiment 1: the connection of titanium alloy (Ti-6Al-4V) and copper alloy (oxygen-free copper),

[0022] A method for diffusion welding a titanium alloy and a copper alloy utilizing a niobium intermediate layer, comprising the following steps:

[0023] 1) Surface cleaning of the workpiece before welding: select niobium foil as the intermediate layer connecting the Ti-6Al-4V alloy and the oxygen-free copper disc, the niobium intermediate layer has a purity of 99%, a thickness of 50 μm, and a diameter of 25 mm; the weldment is 25 mm in diameter Ti-6Al-4V alloy and oxygen-free copper disc; use surface grinder, grinder and other equipment to process the surface to be welded of Ti-6Al-4V alloy, oxygen-free copper disc and niobium foil, and then use a particle size of 1000 #, 1500# and 2000# metallographic sandpapers were polished step by step; then the Ti-6Al-4V alloy, oxygen-free copper disc and niobium foil were rinsed with deionized water, and ultrasonically cleaned wit...

Embodiment 2

[0027] Embodiment 2: the connection of titanium alloy (Ti-6Al-4V) and copper alloy (bronze),

[0028] A method for diffusion welding a titanium alloy and a copper alloy utilizing a niobium intermediate layer, comprising the following steps:

[0029] 1) Surface cleaning of the workpiece before welding: choose niobium foil as the intermediate layer connecting the Ti-6Al-4V alloy and the bronze disc, the niobium intermediate layer is 99% pure, 100 μm in thickness, and 25 mm in diameter; the weldment is a Ti- 6Al-4V alloy and bronze disc; use surface grinder, grinder and other equipment to process the surface of Ti-6Al-4V alloy, bronze disc and niobium foil to be welded flat, and then use the particle size of 1000#, 1500# and 2000# # metallographic sandpaper was polished step by step; then the Ti-6Al-4V alloy, bronze disc and niobium foil were rinsed with deionized water, and ultrasonically cleaned with acetone for 10 min, and set aside.

[0030] 2) Weldment assembly and furnace:...

Embodiment 3

[0032] Embodiment 3: the connection of titanium alloy (Ti-5Al-2.5Sn) and copper alloy (brass),

[0033] A method for diffusion welding a titanium alloy and a copper alloy utilizing a niobium intermediate layer, comprising the following steps:

[0034]1) Surface cleaning of the workpiece before welding: select niobium powder as the intermediate layer connecting the Ti-5Al-2.5Sn alloy and the brass disc, the niobium intermediate layer has a purity of 99%, an average particle size of 5 μm, a layer thickness of 100 μm, and a diameter of 25 mm; The weldment is a Ti-5Al-2.5Sn alloy and brass disc with a diameter of 25mm. The surface to be welded of the Ti-5Al-2.5Sn alloy and brass disc is processed with a surface grinder, a grinder and other equipment, and then the grain size 1000#, 1500# and 2000# metallographic sandpapers were used to polish and smooth step by step; then the Ti-5Al-2.5Sn alloy and brass discs were rinsed with deionized water, and ultrasonically cleaned with aceton...

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Abstract

The invention relates to a method for welding titanium alloy and copper alloy. A method for diffusion-welding titanium alloy and copper alloy by using niobium intermediate layer is characterized in that the method comprises the following steps: (1) selecting niobium foil or powder as the intermediate layer for connecting a titanium alloy sheet and a copper alloy sheet, and cleaning the surfaces to be welded of the titanium alloy sheet and the copper alloy sheet; (2) arranging the niobium intermediate layer between the titanium alloy sheet and the copper alloy sheet, putting the whole into a graphite mold, transferring the graphite mold into a vacuum welding furnace, and applying a pre-pressure of 0.5 to 2 MPa to compress the mold; and (3) vacuuming the vacuum welding furnace, heating when the vacuum degree is larger than 5*10<-3> Pa with a speed of 2 to 10 DEG C / min to 700 to 850 DEG C, keeping the temperature for 30 to 60 min, applying an axial pressure of 5 to 10 MPa before keeping the temperature, decreasing the temperature when reaching the temperature-keeping time, discharging the pressure and cooling. The method can achieve high-strength connection between titanium alloy and copper alloy, and is suitable for high-strength connection of various kinds of titanium and copper alloys.

Description

technical field [0001] The invention relates to a method for welding metal titanium alloy and copper alloy. Background technique [0002] The development of modern science and technology often requires different parts of the same component to withstand different working conditions. It is not only uneconomical, but sometimes impossible to manufacture such components with a single metal material. If you can combine several different metals into components and make the metals on different parts of the components the best materials that can withstand the corresponding working conditions, you can maximize the potential of various materials. [0003] As an important structural material, titanium alloy has the advantages of small specific gravity, high strength, good heat resistance and corrosion resistance. It is widely used in aviation, aerospace, petrochemical, medical and other fields, but its high price limits its further promotion. application. Copper alloy has good ductili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/14B23K20/24
Inventor 张联盟王传彬沈强罗国强曾浩
Owner WUHAN UNIV OF TECH
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