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Titanium alloy and stainless steel dissimilar vacuum electronic beam welding method

A technology of vacuum electron beam and welding method, which is applied in the direction of electron beam welding equipment, welding equipment, welding/welding/cutting articles, etc., can solve the problems such as poor welding quality of C4 titanium alloy and 316L stainless steel dissimilar metals, and achieve favorable Precise control, prevention of deformation, favorable effect of bonding

Inactive Publication Date: 2020-06-19
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a vacuum electron beam welding method for dissimilar metals of titanium alloy and stainless steel, so as to solve the problem of poor welding quality of dissimilar metals of C4 titanium alloy and 316L stainless steel.

Method used

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  • Titanium alloy and stainless steel dissimilar vacuum electronic beam welding method
  • Titanium alloy and stainless steel dissimilar vacuum electronic beam welding method
  • Titanium alloy and stainless steel dissimilar vacuum electronic beam welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Grind and polish the surface to be welded between TC4 titanium alloy and AISI 316L stainless steel to make the surface roughness Ra≤1.0μm; then pickle the polished sample, and use hydrofluoric acid for the oxide film on the titanium alloy surface and nitric acid mixed solution to remove; for the oxide film on the surface of copper foil, dilute H 2 SO 4 Then, put the treated titanium alloy, stainless steel, copper foil and niobium foil together into acetone for ultrasonic cleaning for 15 minutes, then wipe the surface of the sample to be welded with alcohol, dry it with cold wind, and finally get Treated titanium alloy, stainless steel, copper foil and niobium foil; the above-mentioned cleaning methods are prior art known in the art;

[0046] The processed titanium alloy, stainless steel, 500 μm copper foil and 550 μm niobium foil are docked and placed in a certain order, the sequence is stainless steel-copper foil-niobium foil-titanium alloy. Specific as figure 1 As ...

Embodiment 2

[0050] The same welding process as in Example 1 was used to weld the titanium alloy and stainless steel. The other conditions are the same as in Example 1 except that the electron beam is shifted to the copper foil side by 0.2mm when the first welding is performed on the interface between the copper foil and the stainless steel.

Embodiment 3

[0052] The same welding process as in Example 1 was used to weld the titanium alloy and stainless steel. The other conditions are the same as in Example 1 except that the electron beam is shifted to the copper foil side by 0.3mm when the first welding is performed on the interface between the copper foil and the stainless steel.

[0053] The microstructure topography figure in the weld zone of this embodiment is shown in image 3 , it can be seen from the figure that the side of the copper foil is mainly composed of copper-iron solid solution, and the side of the niobium foil is mainly composed of titanium-niobium solid solution.

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Abstract

The invention discloses a titanium alloy and stainless steel dissimilar vacuum electronic beam welding method, and belongs to the technical field of metal material welding. The method mainly includesthe steps of: cleaning the surface to be welded of a sample; assembling the sample; and welding through an electronic beam welding technology. A copper and niobium compound sandwich layer is added between a TC4 titanium alloy and 316L stainless steel; the placement sequence is TC4 titanium alloy-niobium foil-copper foil-316L stainless steel or 316L stainless steel-copper foil-niobium foil-TC4 titanium alloy; through selection of proper parameters such as electronic beam flow, acceleration voltage, welding speed and beam deviation distance and the thickness of the sandwich layer, a transition solid solution phase is formed in a welding line molten bath, so that the diffusion reaction among the elements such as titanium, iron and chromium is inhibited, formation of a brittle titanium and iron intermetallic compound is prevented to damage the performance of a welding line; and a welding joint obtained by the welding method is lower in hardness, higher in tensile strength and free of obvious defects such as air holes and cracks.

Description

technical field [0001] The invention relates to the technical field of metal material welding, in particular to a vacuum electron beam welding method for dissimilar metals of titanium alloy and stainless steel. Background technique [0002] The normal operation of the infrared focal plane detector requires a micro metal Dewar device to provide good electrical, mechanical, thermal and optical transmission channels. The main materials used to manufacture micro metal Dewars include titanium alloys and stainless steel. Due to the advantages of high strength, toughness, high melting point, excellent corrosion performance and low density, titanium alloy is widely used in petrochemical, machinery manufacturing and aviation industries; 316L stainless steel is a kind of stainless steel with low corrosion resistance. High-speed, reliable high-strength and low-cost structural materials, good corrosion resistance and excellent low temperature performance, processing performance and wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/06B23K103/24
CPCB23K15/0033B23K15/006B23K15/06B23K2103/24
Inventor 蒋小松张亚丽吕星星谌金梅高奇莫德锋李雪
Owner SOUTHWEST JIAOTONG UNIV
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