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Method for welding non-defective low-energy-consumption 2219 aluminum alloy

A welding method and aluminum alloy technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of unresolved AC arc welding instability, unstable welding process, small welding penetration, etc., to reduce porosity and other defects, welding current reduction, and the effect of increasing welding penetration

Inactive Publication Date: 2014-03-12
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

AC TIG welding has the following problems: small welding penetration, unstable welding process, easy to produce pores, etc.
[0006] On this basis, research on AC active welding of aluminum alloys has been carried out in China, but the main direction of the research is to improve the welding penetration of aluminum alloys, and the instability of AC arc welding and the resulting defects have not been solved.

Method used

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  • Method for welding non-defective low-energy-consumption 2219 aluminum alloy
  • Method for welding non-defective low-energy-consumption 2219 aluminum alloy
  • Method for welding non-defective low-energy-consumption 2219 aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: DC welding of 2219 aluminum alloy with a thickness of 4mm

[0026] Weigh LiF, NaF, CaF according to the ratio 2 , the particle size of each fluoride is less than 10 μm, mix evenly, and make a paste with absolute ethanol. Clean the surface of 2219 aluminum alloy before welding, and then use a brush to evenly coat the chemically cleaned 2219 aluminum alloy on the surface to be welded. The 4mm thick 2219 aluminum alloy plate is butt welded by TIG DC positive polarity welding, and the defect detection and mechanical performance test are carried out after welding.

[0027] See the following table for specific proportioning ingredients, welding parameters and average tensile strength of welded joints:

[0028]

[0029] Test conditions: MTS-880 universal material testing machine is used to test the tensile strength of the above-mentioned 2219 aluminum alloy welded joints.

Embodiment 2

[0030] Embodiment 2: DC welding of 2219 aluminum alloy with a thickness of 8 mm

[0031] Weigh LiF and KAlF according to the ratio 4 、K 3 AlF 6 , the particle size of each fluoride is less than 10 μm, mix evenly, and make a paste with absolute ethanol. Clean the surface of 2219 aluminum alloy before welding, and then use a brush to evenly coat the chemically cleaned 2219 aluminum alloy on the surface to be welded. The 8mm thick 2219 aluminum alloy plate is butt welded by TIG DC positive polarity welding, and the defect detection and mechanical performance test are carried out after welding.

[0032] See the following table for specific proportioning ingredients, welding parameters and average tensile strength of welded joints:

[0033]

[0034] Test conditions: MTS-880 universal material testing machine is used to test the tensile strength of the above-mentioned 2219 aluminum alloy welded joints.

Embodiment 3

[0035] Embodiment 3: DC welding of 2219 aluminum alloy with a thickness of 12mm

[0036] Weigh KAlF according to the ratio 4 , LiF, CaF2 , NaF, the particle size of each fluoride is less than 10μm, mix evenly, and reconcile it into a paste with absolute ethanol. Clean the surface of 2219 aluminum alloy before welding, and then use a brush to evenly coat the chemically cleaned 2219 aluminum alloy on the surface to be welded. The 12mm thick 2219 aluminum alloy plate is butt welded by TIG DC positive polarity welding, and the defect detection and mechanical performance test are carried out after welding.

[0037] See the following table for specific proportioning ingredients, welding parameters and average tensile strength of welded joints:

[0038]

[0039] Test conditions: MTS-880 universal material testing machine is used to test the tensile strength of the above-mentioned 2219 aluminum alloy welded joints.

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Abstract

The invention discloses a method for welding non-defective low-energy-consumption 2219 aluminum alloy. The method is characterized in that before welding, a to-be-welded part on the surface of 2219 aluminum alloy is sprayed with a layer of a surface film removing agent, and then the 2219 aluminum alloy is welded through a TIG welding processing method in a direct-current positive polarity mode. The surface film removing agent is composed of one or more kinds of fluoride in LiF, NaF, CaF2, KAlF4, K3AlF6 and the like. By means of the welding method, the 2219 aluminum alloy in the thickness range of 1mm-12mm can be formed through welding at a time without the need of grooving. The surface film removing agent has the functions of well removing oxidation films on the surface of the 2219 aluminum alloy and increasing the welding fusion depth, and welding currents are only 50% of currents in an alternating-current welding mode. Besides, no pore defects exist in welding seams of the welded 2219 aluminum alloy, and the tensile strength of a welding joint is 260-290MPa.

Description

technical field [0001] The invention belongs to the field of welding and relates to a welding method. Specifically, it refers to a welding method of 2219 aluminum alloy with no defects and low energy consumption. The process is: before welding, first spray a layer of surface remover on the surface of 2219 aluminum alloy to be welded, and then adopt the TIG welding process of DC positive polarity Method welding 2219 aluminum alloy. Background technique [0002] 2219 aluminum alloy is one of the important structural materials in the aerospace field, and occupies an extremely important position in the aerospace field such as the production and manufacture of launch vehicles, satellites, spacecraft and missiles. The weldability of aluminum alloy is relatively poor, mainly due to: ①It is easy to oxidize in the air, forming dense alumina, resulting in welding slag; ②It is easy to produce defects such as pores during welding; ③The thermal conductivity and thermal expansion coeffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/235B23K9/23B23K9/167B23K35/365
CPCB23K9/167B23K9/23B23K9/235B23K35/3605B23K2103/10
Inventor 曲文卿姚君山牟国倩张聃尹玉环郭立杰庄鸿寿
Owner BEIHANG UNIV
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