A kind of dissimilar metal electron beam welding method of titanium alloy and Kovar alloy

A technology of electron beam welding and dissimilar metals, which is applied in the field of electron beam welding of dissimilar metals between titanium alloys and Kovar alloys, and in the field of welding between titanium alloys and Kovar alloys, and can solve the problems of poor welding performance between titanium alloys and Kovar alloys. , to achieve the effects of preventing sample deformation, improving mechanical properties, and requiring less workpiece shape and size

Active Publication Date: 2020-03-31
SOUTHWEST JIAOTONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for electron beam welding of dissimilar metals between titanium alloy and Kovar alloy in order to overcome the disadvantages of poor welding performance of titanium alloy and Kovar alloy in the prior art

Method used

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  • A kind of dissimilar metal electron beam welding method of titanium alloy and Kovar alloy
  • A kind of dissimilar metal electron beam welding method of titanium alloy and Kovar alloy
  • A kind of dissimilar metal electron beam welding method of titanium alloy and Kovar alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Grind and polish the surface of TC4 titanium alloy and 4J29 Kovar alloy to be welded to make the roughness Ra≤1.0μm; pickle the polished sample, and use a mixed solution of hydrofluoric acid and nitric acid to remove the titanium alloy. Surface oxide film; and using H 2 SO 4 solution to remove the oxide film on the surface of copper foil. Then, the copper foil and niobium foil were put into acetone and ultrasonically cleaned for 15 minutes, the surface to be welded was wiped with alcohol, and dried with cold air to obtain cleaned titanium alloy, kovar alloy, copper foil and niobium foil.

[0048] The obtained titanium alloy, kovar alloy, copper foil and niobium foil after surface cleaning are docked and placed sequentially according to kovar alloy-copper foil-niobium foil-titanium alloy. Specific as figure 1 As shown, Kovar 1, copper foil 2, niobium foil 3, and titanium alloy 4 are arranged in sequence and clamped by the clamp. Rigidly fixed in a fixture with shaped...

Embodiment 2

[0052] The welding of the titanium alloy and the Kovar alloy was carried out using the same process as in Example 1. Except that the thickness of the copper foil is 510 μm, and the thickness of the niobium foil is 380 μm, other conditions are the same as those in Example 1.

Embodiment 3

[0054] The welding of the titanium alloy and the Kovar alloy was carried out using the same process as in Example 1. Except that the thickness of the copper foil is 520 μm, and the thickness of the niobium foil is 400 μm, other conditions are the same as those in Example 1.

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Abstract

The invention discloses a dissimilar metal electron beam welding method of titanium alloy and kovar alloy, which specifically comprises the following steps: (1) taking titanium alloy, kovar alloy, copper foil and niobium foil, and cleaning the surface thereof; (2) ) Place the cleaned titanium alloy, Kovar alloy, copper foil and niobium foil alternately; (3) Welding: Fix the placed sample in the fixture, clamp it, and weld it with an electron beam welding machine in the vacuum chamber . The dissimilar metal welding method of the present invention adopts a double transition layer, and forms a solid solution transition at the weld seam by adjusting welding process parameters and material selection, thereby preventing mutual diffusion of titanium and iron elements and avoiding the formation of brittle compounds, and the obtained weld seam has a lower hardness , high tensile strength, no pores and cracks and so on.

Description

technical field [0001] The invention relates to a welding method for a titanium alloy and a Kovar alloy, in particular to a dissimilar metal electron beam welding method for a titanium alloy and a Kovar alloy, and belongs to the technical field of material welding (connection). Background technique [0002] Titanium and titanium alloys are widely used in petrochemical, cryogenic and aviation industries due to their high strength and toughness, high melting point, excellent corrosion performance and low density. Kovar alloy is an alloy with a linear expansion coefficient similar to that of borosilicate hard glass, and has good low-temperature structural stability. It has a high Curie point and is a commonly used hard glass sealing alloy in the world. It is mainly used in electric vacuum components. manufacturing and packaging areas. [0003] The miniature metal Dewar device provides good electrical, mechanical, thermal and optical transmission channels for the low-temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K15/00B23K15/06
CPCB23K15/0033B23K15/0093B23K15/06
Inventor 蒋小松方永建莫德锋孙大明邵甄胰朱德贵朱旻昊
Owner SOUTHWEST JIAOTONG UNIV
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