A kind of arc additive manufacturing method of 5083 aluminum alloy/tc4 titanium alloy structure

Abstract

The invention discloses an arc added material manufacturing method of 5083 aluminum alloy / TC4 titanium alloy structures, and belongs to the technical field of arc added material manufacturing of dissimilar materials. The method is to realize connection between aluminum alloys and titanium alloys by using the arc added material manufacturing method on the surfaces of titanium alloy structures and to finish formation of aluminum alloy structures. According to the characteristics of large melting point difference between the aluminum alloys and the titanium alloys, tungsten electrode argon arcs are used as heat sources for heating aluminum alloy welding wires for fusion to connect with the titanium alloys; and then, the added material manufacturing method is used for preparing the aluminum alloy structures to finally form aluminum alloy / titanium alloy composite structures. The method realizes manufacturing of large or complicated aluminum alloy / titanium alloy structures, can improve the mechanical performances of joints, simplifies procedures, and realizes convenient, efficient and automatic connection of the aluminum alloys / titanium alloys. The method can effectively reduce the thickness of connecting interface intermetallic compound layers; the thickness of the aluminum alloy / titanium alloy connecting interface intermetallic compound layers is 2.25-3.5 microns; and the connecting strength of the joints can reach 171.6 MPa.

Description

technical field [0001] The invention relates to an arc additive manufacturing method of a 5083 aluminum alloy / TC4 titanium alloy structure, belonging to the technical field of arc additive manufacturing of dissimilar materials. Background technique [0002] Aluminum alloy and titanium alloy are widely used in many industrial fields, and the connection structure of aluminum alloy / titanium alloy can give full play to the comprehensive performance advantages of the two, and has broad application prospects and important applications in aerospace, rail transit and other fields value. [0003] Aluminum alloy has low density, high specific strength, weldability, good corrosion resistance, no low temperature brittleness, and no magnetism. It is one of the most widely used materials in the industrial field. 5083 aluminum alloy is one of the commonly used aluminum alloys. 5083 aluminum alloy is an Al-Mg alloy with good plasticity, corrosion resistance and welding performance. It belo...

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Problems solved by technology

[0006] Due to the huge difference between the thermophysical and chemical properties of aluminum alloy and titanium alloy, especially when aluminum and titanium are connected, a large number of brittle intermetallic compounds are easily produced, resulting in a significant decrease in the mechanical properties of the joint, so the welding of the two is very difficult, mainly in The following aspects: (1) Both aluminum and titanium are active metals, which are prone to oxidation in air to form dense TiO 2 and Al 2 o 3 , leading to defects such as weld slag inclusions and reducing joint strength

In addition, the hydrogen, oxygen and nitrogen absorption behavior of titanium at high temperature also reduces the performance of the joint; (2) the melting point difference between aluminum and titanium is about 1000 ° C, if the fusion welding method is used to connect the two, when the temperature reaches the melting point of titanium, The elements of aluminum and aluminum alloy will be burned and evaporated in large quantities; (3) The linear expansion coefficient and thermal conductivity of aluminum and titanium are very different, and the linear expansion coefficient and thermal conductivity of titanium are about 1 / 3 and 1 / 3 of aluminum respectively. 16; (4) The lattice types, lattice parameters, and atomic radii of aluminum and titanium are quite different, resulting in a very low solid solubility between the two, which easily reacts to form hard and brittle intermetallic compounds. Under the action of welding stress, it is easy to cause welding cracks and reduce the mechanical properties of welded joints

The common arc welding method is very difficult to connect aluminum alloys to titanium alloys

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