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Stir-welding head for aluminum alloy thick plate welding and welding method thereof

A welding method and aluminum alloy technology, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of joint performance degradation, stirring needles are easy to break, etc., and achieve improved tensile strength, less breakage, and increased strength Effect

Active Publication Date: 2015-05-27
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of the design of the stirring head, the traditional stirring needle is cylindrical or conical. When welding the thick plate high-strength aluminum alloy, the root of the stirring needle is easy to break, so it is necessary to improve the existing stirring head, and the thickness of the thick plate high-strength aluminum alloy Welding traditionally uses single-sided friction stir welding. Due to the large difference in temperature field and flow field along the thickness direction, the performance of the joint is reduced. Therefore, the double-sided welding method is used to significantly improve the mechanical properties of the welded joint.

Method used

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  • Stir-welding head for aluminum alloy thick plate welding and welding method thereof

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Effect test

Embodiment 1

[0022] This embodiment is a stirring head and a method for welding a 20mm thick 7A52 high-strength aluminum alloy, including the following steps:

[0023] (1) Material of the stirring head: the material of the stirring head is austenitic high-nitrogen steel containing 0.4% N, and the deformation of the austenitic high-nitrogen steel is 45% during processing. (2) The overall design of the mixing head: The mixing head adopts an overall design, that is, the clamping end 3, the shaft shoulder 2, and the stirring needle 1 are processed from the same austenitic high-nitrogen steel material. (3) Structural design of the stirring head: the head of the stirring needle is in the shape of a truncated cone, and the root of the stirring needle connected to the shaft shoulder adopts a non-proportional thickening design, which is also in the shape of a truncated cone, θ 2 =16°, θ 1 =10°;H 2 =8mm,H 1 =19.7mm. The upper part of the shaft shoulder connected with the stirring needle is in th...

Embodiment 2

[0025] This embodiment is a stirring head and a method for welding a 30mm thick 7A52 high-strength aluminum alloy, including the following steps:

[0026] (1) Material of the stirring head: the material of the stirring head is austenitic high-nitrogen steel containing 0.4% N, and the deformation of the austenitic high-nitrogen steel is 50% during processing. (2) The overall design of the stirring head: the stirring head adopts an overall design, that is, the clamping end 3 of the stirring head, the shaft shoulder 2, and the stirring needle 1 are processed from the same austenitic high-nitrogen steel material. (3) Structural design of the stirring head: the head of the stirring needle is in the shape of a truncated cone, and the root of the stirring needle connected to the shaft shoulder adopts a non-proportional thickening design, which is also in the shape of a truncated cone, θ 2 =14°, θ 1 =10°;H 2 =12mm, H 1 =29.7mm. The upper part of the shaft shoulder connected with t...

Embodiment 3

[0028] This embodiment is a stirring head and a method for welding a 40mm thick 7A52 high-strength aluminum alloy, including the following steps:

[0029] (1) Material of the stirring head: the material of the stirring head is austenitic high-nitrogen steel containing 0.4% N, and the deformation of the austenitic high-nitrogen steel is 50% during processing. (2) The overall design of the stirring head: the stirring head adopts an overall design, that is, the clamping end 3 of the stirring head, the shaft shoulder 2, and the stirring needle 1 are processed from the same austenitic high-nitrogen steel material. (3) Structural design of the stirring head: the head of the stirring needle is in the shape of a truncated cone, and the root of the stirring needle connected to the shaft shoulder adopts a non-proportional thickening design, which is also in the shape of a truncated cone, θ 2 =16°, θ 1 =12°;H 2 =12mm, H 1 =34.7mm. The upper part of the shaft shoulder connected with t...

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Abstract

The invention discloses a stir-welding head for aluminum alloy thick plate welding and a welding method thereof. The stir-welding head for the aluminum alloy thick plate welding comprises a stir-welding needle, a shaft shoulder and a clamping end; the stir-welding needle is installed at the center of the upper end of the shaft shoulder; the stir-welding head is the integral structure formed by processing austenitic high nitrogen steel in which the nitrogen content is 0.4%-0.7%, and the root of the connection between the stir-welding needle and the shaft shoulder presents the non-proportional overstriking design; and the double-faced friction stir welding method is used for welding. The stir-welding head is the integral structure formed by processing the austenitic high nitrogen steel, and the stir-welding needle connected with the shaft shoulder uses the non-proportional overstriking design, so the intensity of the stir-welding head is greatly improved, the probability of stir-welding needle fracture is reduced, and the service life is prolonged; and the double-faced friction stir welding method is used for welding, the tensile strength of a welded joint is improved more than 1% compared with the single-faced welding, the welded joint has not the defects, such as welding bubble, crack, loose and lack of fusion, the internal quality of the welded joint is up to the level 1, and the mechanical property of the welded joint is improved.

Description

technical field [0001] The invention belongs to the technical field of welding, and in particular relates to a stirring head for welding aluminum alloy thick plates and a welding method thereof. Background technique [0002] 2××× series and 7××× series heat-treated deformation-strengthened aluminum alloys are high-strength aluminum alloys, and the tensile strength of the plates is above 400MPa. Among them, aluminum alloys such as 7A52, 7A05 and 2519 are representatives of such high-strength aluminum alloys. With the application of high-strength aluminum alloys in large structural parts, not only the weight of structural parts can be significantly reduced, but also the weight of structural parts can be reduced. Quantification brings many other conveniences. [0003] Friction stir welding (friction stir weld abbreviated as FSW) is a new type of solid-state joining process first invented by the British Welding Institute (TWI) in 1991. It is specially used to weld conventional ...

Claims

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Application Information

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IPC IPC(8): B23K20/12
CPCB23K20/122B23K20/1255
Inventor 陈东高马志华王有祁陈东亮明珠刘红伟杨武林王法科马冰任宝辉程朝丰
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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