Al-Ti alloy dissimilar metal welding method

A technology of dissimilar metals and welding methods, which is applied in the field of invention related to excitation, can solve problems such as welding difficulties and reduce the service life of welded parts, and achieve the effects of avoiding the formation of Al-Ti brittle phases, solving difficulties in welding, and improving service life

Inactive Publication Date: 2019-05-31
JIANGSU HAIYU MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Al alloys and Ti alloys are difficult to weld due to differences in physical and chemical properties such as melting point and reflectivity
Due to the difference in physical and chemical composition of Al alloy and Ti alloy, direct welding of these two metals is easy to lead to the generation of brittle intermetallic compound phase Al-Ti phase
The generation of Al-Ti brittle phase will lead to brittle fracture of Al-Ti alloy dissimilar metal weldment, which will significantly reduce the service life of weldment

Method used

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  • Al-Ti alloy dissimilar metal welding method

Examples

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Effect test

Embodiment 1

[0022] The Al alloy powder used in Example 1 is A6061-T6 aluminum alloy powder, and the Ti alloy powder is TC4 titanium alloy powder. Example 1 uses a direct welding method of A6061-T6 aluminum alloy and TC4 titanium alloy dissimilar metals. The specific steps are as follows:

[0023] (1) Polish the welding surface of the metal to be welded until the oxide film on the surface is removed.

[0024] (2) Use laser welding to directly weld A6061-T6 aluminum alloy and TC4 titanium alloy. The welding process parameters are laser power 350W, laser control current 50A, pulse width 15ns, and pulse frequency 8Hz.

[0025] (3) Test the tensile properties of the dissimilar metal weldments directly welded by A6061-T6 aluminum alloy and TC4 titanium alloy as comparative group 1.

Embodiment 2

[0027] The Al alloy powder used in Example 2 is A6061-T6 aluminum alloy powder, and the Ti alloy powder is TC4 titanium alloy powder. This example uses the method described in this method for welding Al-Ti alloy dissimilar metals with gradient changes in transition metal composition , The length of the transition metal is 30mm, the number of layers is N=600, the specific dimensions of the substrate and the transition metal plate are as follows figure 2 Shown.

[0028] An example of an Al-Ti alloy dissimilar metal welding method with a gradient change of transition metal composition, the steps are:

[0029] (1) Two powder feeders respectively storing two powders are placed on the surface of the worktable at the same time, and the preparation of the transition metal plate with a gradient of composition is started. The parameters of laser additive manufacturing are: laser power 300W, spot diameter is 0.12mm, and each layer of additive is 0.05mm.

[0030] (2) Each time the printing of ...

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Abstract

The invention relates to the fields of laser welding and laser additive manufacturing, in particular to an Al-Ti alloy dissimilar metal welding method. According to the Al-Ti alloy dissimilar metal welding method, the mode that a transition metal plate variable in compositional gradient is connected with Al-Ti alloy dissimilar metal is adopted, accordingly, welding between dissimilar metals is converted into welding of similar metals, and the problem that the difference between the melting point of aluminum and the melting point of titanium is too large, and thus, the aluminum and the titaniumare difficult to weld is effectively solved; and in addition, Al-Ti brittle phase forming in the welding process of the Al-Ti alloy dissimilar metal is effectively avoided, accordingly, the welding quality of the Al-Ti alloy dissimilar metal is improved, and the service life of a Al-Ti alloy dissimilar metal welding piece is prolonged.

Description

Technical field [0001] The present invention relates to the field of laser welding and laser additive manufacturing, in particular to a welding method of Al-Ti alloy dissimilar metals, which can effectively solve the problem of Al-Ti alloy dissimilar metals by using transition metal plates with gradient changes in composition. The difficulty of welding caused by the large difference in melting point between Al-Ti alloy and Ti alloy, and effectively avoids the formation of Al-Ti brittle phase during Al-Ti dissimilar metal welding process, thereby improving the welding quality of Al-Ti alloy dissimilar metal The service life of Al-Ti alloy dissimilar metal welding parts. Background technique [0002] Titanium and titanium alloys have the advantages of small specific gravity, high specific strength, strong corrosion resistance, and good high and low temperature mechanical properties. They are widely used in various fields such as aviation, aerospace, ships, chemicals, automobiles an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F7/06B23K26/21B23K26/323B33Y10/00
CPCY02P10/25
Inventor 顾成义徐刚鲁金忠沈华宾罗开玉
Owner JIANGSU HAIYU MACHINERY
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