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A kind of titanium-steel dissimilar metal structure and its preparation method

A dissimilar metal and titanium alloy technology, which is applied in the field of titanium-steel dissimilar metal structure and its preparation, can solve the problems of poor joint strength and poor material mixing degree, and achieve increased strength, increased tensile strength, and help for crushing Effect

Active Publication Date: 2019-10-01
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the different fluidity of dissimilar metal materials, during the friction stir welding process, the offset problem will be considered, and the stirring head will be biased to the side of the metal with good fluidity, so that the dissimilar materials in the residual stirring and mixing part will vary greatly; and Asymmetry of advancing and retreating sides, poor material mixing, poor joint strength

Method used

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  • A kind of titanium-steel dissimilar metal structure and its preparation method
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  • A kind of titanium-steel dissimilar metal structure and its preparation method

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preparation example Construction

[0031] The invention provides a method for preparing a titanium-steel dissimilar metal structure, comprising the following steps:

[0032] (1) The titanium alloy substrate and the steel plate are stacked and overlapped, and a sawtooth structure corresponding to the engagement is formed on the titanium alloy substrate and the steel plate by sawtooth cutting in the overlapping area;

[0033] (2) connecting the titanium alloy substrate and the steel plate through a zigzag structure to obtain a composite plate;

[0034] (3) The composite plate obtained in the step (2) is welded by friction stir welding to obtain a titanium-steel dissimilar metal structure; the steel plate in the composite plate is positioned at the advancing side of the welding process, and the titanium alloy substrate in the composite plate Located on the return side of the soldering process.

[0035] In the present invention, the titanium alloy substrate and the steel plate are stacked and overlapped, and a saw...

Embodiment 1

[0058] Using AISI 4340 steel plate and TC4 titanium alloy plate, first cut the TC4 titanium alloy and AISI 4340 steel into 180×60×2mm samples.

[0059] Then take the AISI 4340 steel plate sample and the TC4 titanium alloy plate sample respectively, according to figure 1 As shown, the edges of the two test plates are closely lapped together and fixed. In order to ensure that the sawtooth meshing structure is completely located in the lap area, the width of the lap area is set to be higher than the height of the saw teeth. Here, the width of the lap area is 8mm, and then start at 2mm from the outer edge of the overlapping area, and conduct wire EDM along its length.

[0060] During the cutting process, an electric spark cutting program is set to form a corresponding meshing triangular sawtooth structure on the AISI 4340 steel plate sample and the TC4 titanium alloy plate sample. The sawtooth structure on one of the samples is as follows figure 2 As shown, the sawtooth height h...

Embodiment 2

[0064] The titanium-steel dissimilar metal structure was prepared according to the method of Example 1, except that the plates used were TC4 titanium alloy plate and AISI 4340 steel.

[0065] The corresponding arc-shaped sawtooth structure is obtained by wire electric discharge cutting, and the sawtooth structure on one of the steel plates is as follows image 3 shown.

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Abstract

The invention provides a titanium-steel dissimilar metal structure and a preparation method thereof. The present invention obtains a sawtooth structure with a high degree of fit corresponding to the meshing by stacking and overlapping, and then obtains a composite plate through the meshing connection, and then realizes high-quality welding of titanium-steel dissimilar metals through the friction stir welding method, without considering the offset The impact on the performance of dissimilar metal friction stir welding joints eliminates the asymmetry of the advancing edge and the retreating edge in the traditional butt joint process; and the use of a sawtooth meshing structure increases the effect of the welding force on the material during the welding process on the one hand, which contributes to On the other hand, the linear contact area of ​​dissimilar metals is increased, and the relative movement distance of metal atoms is reduced, so that more atoms can move under the same energy, and the mutual flow and mixing of dissimilar metal materials can be improved. The ability to avoid the problem of uneven mixing of the joint structure makes the weld material interlocking and mixing enhanced, thereby greatly improving the strength of the joint.

Description

technical field [0001] The invention belongs to the technical field of dissimilar metal welding, and in particular relates to a titanium-steel dissimilar metal structure and a preparation method thereof. Background technique [0002] Titanium alloy has the advantages of high strength and good corrosion resistance, and is widely used in aerospace, chemical and other fields. However, the high cost of titanium alloys limits its wide application. Steel is also a lightweight and high-strength material with good plasticity and toughness. Connecting titanium alloys with traditional structural steel can not only reduce costs, but also greatly increase the utilization value of materials while giving full play to their respective advantages. At present, in the field of aerospace, dissimilar metal conduit structures in spacecraft propulsion systems use a large number of dissimilar metal structures of titanium alloy and stainless steel. Up to now, they are mainly connected by a combina...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K20/227B23K20/24B23K33/00
Inventor 陈玉华陈超李树寒黄永德王善林柯黎明
Owner NANCHANG HANGKONG UNIVERSITY
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