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Method for improving mechanical property of laminated armored aluminum alloy friction stir welding joint

A friction stir, welding joint technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems such as uneven mechanical properties, and achieve the effects of easy access, rapid welding, and improved mechanical properties

Active Publication Date: 2020-12-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is mainly to solve the problem of uneven mechanical properties in the thickness direction of laminated armor aluminum alloy friction stir welded joints, and propose a method for improving the mechanical properties of laminated armored aluminum alloy friction stir welded joints

Method used

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  • Method for improving mechanical property of laminated armored aluminum alloy friction stir welding joint
  • Method for improving mechanical property of laminated armored aluminum alloy friction stir welding joint
  • Method for improving mechanical property of laminated armored aluminum alloy friction stir welding joint

Examples

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Effect test

Embodiment 1

[0035] Two pieces of 7B52 laminated armored aluminum alloy plates with a thickness of 12 mm were welded in a butt joint manner by friction stir welding. When the welding speed is 150mm / min, the rotation speed of the stirring head is 600r / min, and the preheating temperature is 150°C, the tensile strength obtained after welding is 350MPa, and the impact absorption energy is 15.1J.

[0036] Adopt the method described in the present invention, the 12mm thick 7B52 laminated armor aluminum alloy machining angle that is used for welding is the bevel of 30 °, process two rows of hole depths at the positions of the first layer and the second layer of the stack along the forward direction of welding 3mm, 2mm hole 1 and filled with TiB particle size 20μm 2 powder, and then use resistance to connect the two plates respectively. Preheat to 150°C from the groove contact surface, and finally use a stirring head with a shaft shoulder diameter of 24mm, a stirring needle root diameter of 12mm, ...

Embodiment 2

[0038] Two pieces of 7B52 laminated armored aluminum alloy plates with a thickness of 16 mm were welded in a butt joint manner by friction stir welding. When the welding speed is 200mm / min, the rotation speed of the stirring head is 500r / min, and the preheating temperature is 150°C, the tensile strength obtained after welding is 375MPa, and the impact absorption energy is 13.8J.

[0039] Adopt the method described in the present invention, to the 16mm thick 7B52 laminated armor aluminum alloy processing angle that is used for welding be the groove of 45 °, when a row of hole depth 4mm is processed at the position of the first layer of the laminate along the welding advance direction, the aperture 2.5mm powder planting holes filled with TiB with a particle size of 20μm 2 powder, and then use resistance to connect two plates respectively. Preheat to 150°C from the groove contact surface, and finally use a stirring head with a shaft shoulder diameter of 32mm, a stirring needle ro...

Embodiment 3

[0041] Two pieces of 20mm thick 7B52 laminated armored aluminum alloy plates were welded by friction stir welding in a butt joint mode. When the welding speed is 50mm / min, the rotation speed of the stirring head is 500r / min, and the preheating temperature is 150°C, the tensile strength obtained after welding is 347MPa, and the impact absorption energy is 11.5J.

[0042]By adopting the method of the present invention, the 20mm thick 7B52 laminated armor aluminum alloy used for welding is processed with a groove angle of 45°, and a row of holes with a depth of 3mm and an aperture of 2mm are processed at the position of the first layer of the laminate along the welding advance direction. The powder-planting holes are filled with TiB with a particle size of 10 μm 2 powder, and then use resistance to connect two plates respectively. Preheat to 150°C from the groove contact surface, and finally use a stirring head with a shaft shoulder diameter of 36mm, a stirring needle root diamet...

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Abstract

The invention discloses a method for improving the mechanical property of a laminated armored aluminum alloy friction stir welding joint. The method comprises the following steps of chamfering, drilling and powder filling, clamping and preheating and welding. According to the method, a laminated armored aluminum alloy friction stir welding joint sample can be simply and quickly welded, the mechanical property of the laminated armored aluminum alloy friction stir welding joint is remarkably improved, by means of the method, filled reinforced phase powder is not prone to being extruded out of aweld joint, powder planting holes can be located at any position in the thickness direction of the weld joint, and the reinforced phase powder can be distributed in the whole weld joint.

Description

technical field [0001] The invention relates to the field of friction stir welding, in particular to a method for improving the mechanical properties of laminated armor aluminum alloy friction stir welding joints. Background technique [0002] The laminated structure plate is prepared by using at least two or more materials to achieve interfacial bonding through various processing methods. The friction stir welding process is similar to forging, the structure of the nugget area is refined, and the strength of the welded joint is also high, but the size characteristics of the stirring pin determine the uneven heat input of the welded joint along the thickness direction, and its structure and mechanical properties along the thickness direction Performance is not the same. [0003] The mechanical properties along the thickness direction of the welded joint show that the tensile strength of the first layer of the laminated armored aluminum alloy is the weakest. In order to incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/24
CPCB23K20/24B23K20/122B23K20/128
Inventor 周琦时孝东孙智鸣孙宏宇马新蕊雷济旭金鸣高健洪浩源胡宇鹏
Owner NANJING UNIV OF SCI & TECH
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