Preparation technology of 6-series aluminum alloy friction stir welding member

A friction stir welding and friction stir technology, which is applied in the field of aluminum alloy components, can solve the problems of large strength loss of aluminum alloy materials, and achieve the effects of better mechanical properties, small strength loss and excellent mechanical properties.

Active Publication Date: 2018-01-12
广西南南铝加工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Technical disadvantages of the existing process: In industrial production, after FSW welding, the heat-treatable aluminum alloy is over-aged due to high-temperature heat treatment again, resulting in a large loss of strength of the aluminum alloy material, and the tensile strength of the weld after welding is the same as that of the mother The tensile strength ratio of the material is ≤0.75, so it is necessary to increase the thickness of the base material to improve the force capacity of the entire component

Method used

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  • Preparation technology of 6-series aluminum alloy friction stir welding member
  • Preparation technology of 6-series aluminum alloy friction stir welding member

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Embodiment 1

[0025] Please refer to figure 1 , the present embodiment provides a preparation process of a 6-series aluminum alloy friction stir welded component, comprising the following steps:

[0026] 1) On-line solution quenching: 4 mm thick, 6-series aluminum alloy profiles to be treated are subjected to on-line solution quenching.

[0027] Among them, the composition and mass percentage of the 6-series aluminum alloy are: Mg: 1.2%, Si: 1.2%, Mn: 1%, Fe: 0.8%, Cu: 0.8%, Cr: 0.4%, and contain one of the following: Or more than one element: Zn≤0.30%, Ti≤0.25%, V≤0.25%, Hf≤0.25%, Sc≤0.25%, Zr≤0.25%, and the rest are Al and unavoidable impurities.

[0028] The online solution quenching process parameters are as follows: the heat treatment temperature is 500°C, the cooling method is air cooling, and the cooling rate is 120°C / s.

[0029] 2) Pre-aging: pre-aging the 6-series aluminum alloy profiles after on-line solution quenching.

[0030] The aging temperature for pre-aging is 90°C, and ...

Embodiment 2

[0045] Please refer to figure 1 , the present embodiment provides a preparation process of a 6-series aluminum alloy friction stir welded component, comprising the following steps:

[0046] 1) Offline solution quenching: 5 mm thick, 6-series aluminum alloy profiles to be treated are subjected to offline solution quenching.

[0047] Among them, the composition and mass percentage of the 6 series aluminum alloy are: Mg: 1.5%, Si: 1.5%, Mn: 1.2%, Fe: 1%, Cu: 1.2%, Cr: 0.5%, and contain one of the following Or more than one element: Zn≤0.30%, Ti≤0.25%, V≤0.25%, Hf≤0.25%, Sc≤0.25%, Zr≤0.25%, and the rest are Al and unavoidable impurities.

[0048] Off-line solution quenching process parameters are: heat treatment temperature is 540°C, cooling method is air cooling, and cooling rate is 150°C / s.

[0049] 2) Pre-aging: pre-aging the 6-series aluminum alloy profiles after on-line solution quenching.

[0050] The aging temperature for pre-aging is 130°C, and the holding time is 1h. ...

Embodiment 3

[0057] Please refer to figure 1 , the present embodiment provides a preparation process of a 6-series aluminum alloy friction stir welded component, comprising the following steps:

[0058] 1) Off-line solution quenching: 6 mm thick, 6-series aluminum alloy profiles to be processed are subjected to off-line solution quenching.

[0059] Among them, the composition and mass percentage of the 6-series aluminum alloy are: Mg: 1%, Si: 1%, Mn: 0.8%, Fe: 6%, Cu: 0.8%, Cr: 0.3%, and contain one of the following: Or more than one element: Zn≤0.30%, Ti≤0.25%, V≤0.25%, Hf≤0.25%, Sc≤0.25%, Zr≤0.25%, and the rest are Al and unavoidable impurities.

[0060] The off-line solution quenching process parameters are as follows: heat treatment temperature is 480°C, cooling method is water cooling, and cooling rate is 150°C / s.

[0061] Stretch and straighten 6-series aluminum alloy profiles or plates with a stretch rate of 0.5%.

[0062] 2) Pre-aging: pre-aging the 6-series aluminum alloy profi...

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Abstract

The invention discloses a preparation technology of a 6-series aluminum alloy friction stir welding member. The preparation technology mainly comprises the steps of on-line or off-line solution hardening, preageing, friction stir welding, peak-value artificial ageing and the like. According to the preparation technology of the 6-series aluminum alloy friction stir welding member, a 6-series aluminum alloy material is subjected to low-temperature preageing treatment after being subjected to solution hardening to enable the strength of aluminum alloy to keep low in a certain time, then frictionstir welding is conducted, forced cooling is conducted in a welded high-temperature area while welding is conducted to enable a solution hardening effect to be achieved, and peak-value artificial ageing is conducted on the overall member after welding is completed, so that it is guaranteed that the strength loss at the welded portion is low, and the ratio of the tensile strength of a weld joint tothe tensile strength of a base material is larger than or equal to 0.85.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy components, in particular to a preparation process for a 6-series aluminum alloy friction stir welded component. Background technique [0002] Compared with other aluminum alloys, 6-series aluminum alloys have moderate strength and excellent welding performance, and have been widely used in transportation and other fields. At present, the production steps of industrially produced 6-series aluminum alloy welded components are: cutting 6xxx-T5 / T6 profiles or plates, and connecting them by welding methods such as friction stir welding (FSW). [0003] Technical disadvantages of the existing process: In industrial production, after FSW welding, the heat-treatable aluminum alloy is over-aged due to high-temperature heat treatment again, resulting in a large loss of strength of the aluminum alloy material, and the tensile strength of the weld after welding is the same as that of the parent materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/24B23P15/00C22C21/08C22C21/02C22C21/00C22F1/05
Inventor 何建贤赵启忠杨鸿驰周文标朱希一覃珊
Owner 广西南南铝加工有限公司
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