Methods for preparing transition joint of different metal materials

Abstract

The invention provides methods for preparing a transition joint of different metal materials, relates to the methods for preparing the joint of the different metal materials, and solves the problems of low reliability and poor gas tightness of the joint of different metal materials by adopting the prior connecting method. The first method comprises the following steps: 1, grinding a metal material A; 2, deoiling and cleaning the metal material A, heating the metal material A and preserving the heat under an air condition; 3, performing hot pressing joining of the heated metal material A and a metal material B; 4, preserving the heat, and then obtaining the transition joint of the different metal materials. The second method comprises the following steps: 1, grinding the metal material A; 2, deoiling and cleaning the metal material A, heating the metal material A and preserving the heat under a vacuum or inert gas condition; 3, performing hot pressing joining of the heated metal material A and a metal material B; 4, preserving the heat and then obtaining the transition joint of the different metal materials. The transition joint of the different metal material prepared by the methods has the advantages of high connection strength, good air tightness of the joint, high working reliability and the like.

Description

technical field [0001] The present invention relates to a method of preparing joints of dissimilar metallic materials. Background technique [0002] Aluminum alloy is light in weight and good in corrosion resistance, and has been widely used in various fields of national economy. Aluminum alloy has good low-temperature performance, so in aerospace, aviation, refrigeration, transportation and other fields, a large number of aluminum alloys are used to manufacture low-temperature pressure vessels. Such containers are often required to be connected to the outside world with pipes, such as stainless steel, titanium alloy, copper alloy and other pipes. Obtaining reliable transition joints of dissimilar materials is very difficult due to the differences in thermal and mechanical properties between aluminum and alloys such as steel, copper, and titanium, as well as the strong tendency to generate brittle intermetallic compounds at the joint interface. With the general fusion weld...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the defects of low joint reliability and poor airtightness in dissimilar metals connected by existing aluminum alloy or aluminum and stainless steel, titanium alloy or copper alloy connection methods, and provides a method for preparing transition joints of dissimilar metal materials

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