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Diffusion welding method of titanium alloy and dissimilar metal of stainless steel

A technology of dissimilar metals and titanium alloys, applied in the field of dissimilar metal diffusion welding, can solve the problems of poor welding performance of titanium alloys and stainless steel, and achieve the effects of eliminating interface welding stress, simple process and improving mechanical properties.

Inactive Publication Date: 2017-08-11
SOUTHWEST JIAOTONG UNIV
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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 overcome the shortcomings of the poor welding performance of titanium alloy and stainless steel in the prior art, and provide a method for diffusion welding of titanium alloy and stainless steel dissimilar metals

Method used

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  • Diffusion welding method of titanium alloy and dissimilar metal of stainless steel
  • Diffusion welding method of titanium alloy and dissimilar metal of stainless steel
  • Diffusion welding method of titanium alloy and dissimilar metal of stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Grind and polish the surface of TC4 titanium alloy and 316L stainless steel to be welded to make the roughness Ra≤1.0μm; use a mixed solution of hydrofluoric acid and nitric acid to remove the oxide film on the surface of the titanium alloy; and use H 2 SO 4 solution to remove the oxide film on the surface of copper foil; put the polished sample, 20 μm copper foil and 40 μm niobium foil into acetone for ultrasonic cleaning for 15 minutes, wipe the surface to be welded with alcohol, and dry it with cold air to obtain cleaned titanium alloy, stainless steel , copper foil and niobium foil. Stack the obtained titanium alloy, stainless steel, copper foil and niobium foil in sequence according to titanium alloy / niobium foil / copper foil / stainless steel, or stack stainless steel / copper foil / niobium foil / titanium alloy in sequence, and use figure 1The vacuum hot pressing equipment shown in is pressed. During the pressing process, it is necessary to maintain a good axial neutra...

Embodiment 2

[0034] Welding of titanium alloy and stainless steel was carried out using the same process as in Example 1. Except reducing the pressure to 10 MPa, raising the temperature to the diffusion welding temperature of 870° C., and carrying out the second heat preservation and pressure holding for 90 minutes; other conditions are the same as in Example 1.

Embodiment 3

[0036] Welding of titanium alloy and stainless steel was carried out using the same process as in Example 1. Except reducing the pressure to 10 MPa, raising the temperature to the diffusion welding temperature of 900° C., and carrying out the second heat preservation and pressure holding for 90 minutes; other conditions are the same as in Example 1.

[0037] Implementation 4

[0038] Welding of titanium alloy and stainless steel was carried out using the same process as in Example 1. In addition to reducing the pressure to 10MPa, the temperature was raised to a diffusion welding temperature of 920 ° C, and the second heat preservation and pressure holding was carried out for 90 minutes; other conditions were the same as in Example 1;

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Abstract

The invention discloses a diffusion welding method of a titanium alloy and a dissimilar metal of a stainless steel and belongs to the field of dissimilar metal welding. The diffusion welding method mainly comprises the following steps: cleaning a surface to be welded, assembling a sample, and welding by adopting the diffusion welding method. The welding method of the titanium alloy and the stainless steel dissimilar metal provided by the invention is characterized in that a copper and niobium double-transition layer is arranged between the titanium alloy and the stainless steel, and the stacking sequence is titanium alloy, a niobium foil, a copper foil and stainless steel; and by adjusting parameters such as temperature, time and pressure of the diffusion welding and thickness of an interlayer, a solid solution transition can be formed in a weld joint, so as to prevent mutual diffusion of a titanium element and an iron element and to avoid formation of a brittle ferro titanium intermetallic compound. The weld joint obtained by the method has a characteristic of plastic fracture and has the advantages of being high in tensile strength and without pore or crack.

Description

technical field [0001] The invention relates to the field of material welding (connection), in particular to a dissimilar metal diffusion welding method of titanium alloy and stainless steel. Background technique [0002] The miniature metal Dewar device provides good electrical, mechanical, thermal and optical transmission channels for the low-temperature working environment of the infrared focal plane detector, and is the key device for the packaging and protection of the infrared focal plane detector. Titanium alloy and stainless steel are the main materials used in Dewar devices. However, there are many problems in the welding between titanium alloys and stainless steel dissimilar metals used in Dewar materials. The differences in physical and chemical properties of different metal materials (such as expansion coefficient, specific heat capacity, thermal conductivity, melting point, Differences in chemical composition, etc.) will lead to a large residual stress in the w...

Claims

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Application Information

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IPC IPC(8): B23K20/00B23K20/24B23K103/24
CPCB23K20/00B23K20/001B23K20/24B23K2103/24
Inventor 蒋小松宋庭丰李峰方永建邵甄胰莫德锋朱德贵
Owner SOUTHWEST JIAOTONG UNIV
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