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Welding method for 2219/3A21 dissimilar aluminum alloy sleeve connection structure

A dissimilar aluminum alloy, 3A21 technology, used in welding equipment, laser welding equipment, electron beam welding equipment, etc., can solve the problem of easy welding cracks, and achieve the effect of avoiding welding cracks, reliable welding, and inhibiting welding cracks.

Active Publication Date: 2019-02-15
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem of the present invention is: to overcome the deficiencies of the prior art, and propose a welding method for the socket structure of 2219 / 3A21 dissimilar aluminum alloys, which uses a high-energy beam welding method to solve the socket structure of the 2219 aluminum alloy and the 3A21 aluminum alloy Prone to welding cracks

Method used

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  • Welding method for 2219/3A21 dissimilar aluminum alloy sleeve connection structure
  • Welding method for 2219/3A21 dissimilar aluminum alloy sleeve connection structure

Examples

Experimental program
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Effect test

Embodiment 1

[0041] 1. Process the welding interface of 2219 and 3A21 parts, the cross-sectional dimension of the former annular boss a=b=0.5mm, such as figure 2 As shown, the latter remains in the state of no annular boss;

[0042] 2. Degrease, clean and dry 2219 and 3A21 parts;

[0043] 3. Assembly;

[0044] 4. Using laser welding, the parameters are as follows: spot diameter 0.3~0.5mm, defocus amount -5mm~5mm, laser power 1800~2500W, welding speed 15~25mm / s;

[0045] 5. Check the quality of the weld and detect the leak rate of the weld, the leak rate is ≤6.7×10 -7 Pa.m 3 .s -1 .

Embodiment 2

[0047] 1. Process the welding interface of 2219 and 3A21 parts, the cross-sectional dimension of the former ring boss is a=b=1.0mm, and the latter maintains the state of no ring boss;

[0048] 2. Degrease, clean and dry 2219 and 3A21 parts;

[0049] 3. Assembly;

[0050]4. Using electron beam welding, the parameters are as follows: accelerating voltage 60-80KV, welding beam current 12-18mA, defocusing amount 0-2mm, welding speed 15-25mm / s;

[0051] 5. Check the quality of the weld and detect the leak rate of the weld, the leak rate is ≤6.7×10 -7 Pa.m 3 .s -1 .

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Abstract

The invention relates to a welding method for a 2219 / 3A21 dissimilar aluminum alloy sleeve connection structure and belongs to the technical field of metal materials and processes. The invention relates to a method of connecting a 2219 / 3A21 dissimilar aluminum alloy sleeve connection joint reliably. The method solves a welding crack problem caused by welding by means of a conventional method effectively through a reasonable welding structure form design and a special welding process. The dissimilar aluminum alloy structure can be reliably welded fully by means of the method.

Description

technical field [0001] The invention relates to a welding method of a 2219 / 3A21 dissimilar aluminum alloy socket structure, which belongs to the technical field of metal materials and technology, and is used for the reliable connection of an upper storage tank cover, a surface tension management device (PMD) and similar structures. The method refers to that two tubular structures are sleeved together and the ends are sealed and welded, and the outer diameter of one of the two tubular structures matches the inner diameter of the other. Background technique [0002] The upper stage storage tank is located at the top of the rocket and is used for deep space exploration and high-orbit satellite launch. It is used in the Long March 3 series rockets. The upper level storage tank is composed of welded parts such as the front bottom, barrel section, rear bottom and mouth cover. Among them, the weld between the liquid outlet of the liquid propellant management device (PMD) and the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K26/60B23K15/00B23K103/18
CPCB23K15/0033B23K15/0053B23K26/24B23K26/60
Inventor 周炼刚焦好军李玉龙程昊胡太文李海刚康黎
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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