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Method for improving performance of heat-treatable reinforced aluminum alloy friction stir welding joint

A technology of friction stirring and welding joints, applied in the direction of welding/welding/cutting items, welding equipment, non-electric welding equipment, etc., to achieve the effect of inhibiting dissolution and coarsening

Active Publication Date: 2021-08-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of dissolution and coarsening of precipitated phases and coarsening of recrystallized grains at heat-treatable aluminum alloy friction stir welding joints, the present invention proposes a method for improving the performance of heat-treatable aluminum alloy friction stir welding joints

Method used

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  • Method for improving performance of heat-treatable reinforced aluminum alloy friction stir welding joint
  • Method for improving performance of heat-treatable reinforced aluminum alloy friction stir welding joint
  • Method for improving performance of heat-treatable reinforced aluminum alloy friction stir welding joint

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The first step is to select a 4mm thick spray-formed 7055 aluminum alloy plate, the solution heat treatment temperature is 490±5°C, the holding time is 1h, and it is quickly transferred to the quenching device. The quenching medium is 50±5°C warm water, and the aluminum alloy is supersaturated. state;

[0023] Transfer the solid-solution aluminum alloy to a low-temperature storage device for storage, and the temperature of the device is always controlled below zero;

[0024] Take out the aluminum alloy sheet from the storage device, place it on a friction stir welding machine for welding after reaching room temperature, wherein the rotation speed of the stirring head is 100r / min, and the welding speed is 100mm / min;

[0025] During the welding process, spray liquid nitrogen on the rear side of the shoulder to cool the joint;

[0026] After the welding of 7055 aluminum alloy is completed, put the welded parts into the aging heat treatment furnace for aging treatment, the...

Embodiment 2

[0031] The first step is to select 6061 aluminum alloy plate with a thickness of 3mm, the solution heat treatment temperature is 530±5°C, and the holding time is 1h, and it is quickly transferred to the quenching device. The quenching medium is warm water at 50±5°C, and the aluminum alloy is in a supersaturated state;

[0032] Transfer the solid-solution aluminum alloy to a low-temperature storage device for storage, and the temperature of the device is always controlled below zero;

[0033] The aluminum alloy plate is taken out from the storage device and placed on a friction stir welding machine for welding, wherein the rotation speed of the stirring head is 1200r / min, and the welding speed is 200mm / min;

[0034] During the welding process, spray liquid nitrogen on the rear side of the shoulder to cool the joint;

[0035] After the welding of 6061 aluminum alloy is completed, put the weldment into the aging heat treatment furnace for aging treatment, the aging temperature is...

Embodiment 3

[0040] The first step is to select 4.5mm thick 2024 aluminum alloy plate, the solution heat treatment temperature is 490±5℃, the holding time is 1h, and it is quickly transferred to the quenching device. The quenching medium is 50±5℃ warm water, and the aluminum alloy is in a supersaturated state ;

[0041] Transfer the solid-solution aluminum alloy to a low-temperature storage device for storage, and the temperature of the device is always controlled below zero;

[0042] The aluminum alloy plate is taken out from the storage device and placed on a friction stir welding machine for welding, wherein the rotation speed of the stirring head is 1600r / min, and the welding speed is 120mm / min;

[0043] During the welding process, spray liquid nitrogen on the rear side of the shoulder to cool the joint;

[0044] After the welding of 2024 aluminum alloy is completed, put the weldment into the aging heat treatment furnace for aging treatment, the aging temperature is 170 ° C, and the t...

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Abstract

The invention discloses a method for improving the performance of a heat-treatable reinforced aluminum alloy friction stir welding joint. The method mainly comprises the following process steps that firstly, an aluminum alloy material needing to be welded is subjected to solid solution heat treatment, the solid solution temperature is (465-545) + / -5 DEG C, the heat preservation time is 4-8 hours, and after water quenching, the aluminum alloy material is placed in a low-temperature environment to be stored; friction stir welding equipment is adopted for welding the aluminum alloy, rapid cooling treatment is adopted at the welding seam position, it is guaranteed that alloy elements are subjected to solid solution in an aluminum matrix as many as possible while recrystallized grains are restrained from growing, and a supersaturated solid solution is obtained; after friction stir welding is completed, a whole welding part is subjected to peak aging heat treatment, the aging treatment temperature is (150-190) + / -5 DEG C, and the heat preservation time is 7-20 hours. According to the method, dissolution and growth of an aging precipitated phase at a welding joint part can be avoided, softening of the welding joint is inhibited, the strength and plasticity of the welding joint are improved, and finally the friction stir welding joint which is compact in structure, has the strength reaching 85% or above of the strength of base metal and is good in comprehensive performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of friction stir welding and relates to a method for improving the performance of heat-treatable aluminum alloy friction stir welding joints. Background technique [0002] With the development of lightweight technology, high-strength aluminum alloys are more and more widely used in automobiles and aerospace equipment, and the connection of aluminum alloys is also facing more challenges. The friction stir welding process belongs to the solid phase joining technology. The heat input during the welding process is small and the welding temperature is low, which can avoid defects such as coarse precipitates, hole defects, embrittlement and cracking caused by fusion welding. Friction stir welding is a severe plastic deformation process, and the material will undergo dynamic recrystallization at the welded joint. [0003] 2000 series, 6000 series and 7000 series aluminum alloys are heat treatable aluminum alloys. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/12B23K31/02B23K20/12B23K20/233B23K20/24C22F1/04B23K103/10
CPCB23K31/12B23K31/02B23K20/1235B23K20/1275B23K20/2336B23K20/24C22F1/04C22F1/002B23K2103/10
Inventor 武晓燕江海涛米振莉吴彦欣刘建华
Owner UNIV OF SCI & TECH BEIJING
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