Methods for preparing transition joint of different metal materials

A metal material and transition joint technology, applied in metal processing equipment, manufacturing tools, welding equipment, etc., can solve the problems of poor air tightness and low joint reliability, and achieve high joint reliability, low heating temperature, and good vacuum. dense effect

Inactive Publication Date: 2010-04-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Methods for preparing transition joint of different metal materials
  • Methods for preparing transition joint of different metal materials
  • Methods for preparing transition joint of different metal materials

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0010] Specific Embodiment 1: The method for preparing transition joints of dissimilar metal materials in this embodiment is carried out according to the following steps: 1. Process the end of metal material A into a taper of 10°-50°, and the height of the taper surface is 4-70mm, and then grind it Make the surface finish of metal material A as 2. Clean metal material A and metal material B polished in step 1 with acetone to remove oil, heat metal material A to 100-350°C and keep it warm for 10-180min, heat metal material B to 300-580°C and keep it warm for 10 minutes ~180min; 3. Connect the heat-preserved metal material A and metal material B under the condition of a pressure of 10-1000kN by hot pressing, and press all the polished conical surface of the metal material A into the inner cavity of the metal material B to obtain a joint; 4. Heat the joint obtained in step 3 for 0-600 minutes at 400-600°C to obtain a transition joint of dissimilar metal materials; wherein the me...

specific Embodiment approach 2

[0013] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: in step 1, the end of the metal material A is processed into a taper of 20° to 40°, and it is polished so that the surface finish of the metal material A is Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0014] Specific embodiment three: the difference between this embodiment and specific embodiment one is: in step one, the end of the metal material A is processed into a taper of 20° to 40°, and it is polished so that the surface finish of the metal material A is Other steps and parameters are the same as those in Embodiment 1.

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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...

Claims

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Application Information

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IPC IPC(8): B23K20/22B23K20/24B23K103/18B23K103/20B23K103/14B23K103/12B23K103/10
Inventor 张杰刘春凤张九海
Owner HARBIN INST OF TECH
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