Filling method for friction stir welding keyhole

A technology of friction stir welding and filling method, applied in the field of friction stir welding, can solve the problems of high residual stress, many pores and complex structure at the fusion welding seam, and achieve the effect of good connection effect and high filling efficiency.

Inactive Publication Date: 2017-04-26
SHENYANG AEROSPACE UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is only suitable for metals with good weldability such as aluminum alloys, and the residual stress at the welding seam is high and there are many pores
(4) The special equipment (structure) method, backfill spot welding equipment, retractable stirring needle, etc. are all designed for the elimination of keyholes, but these equipment (structures) have complex structures, and the relative movement between the stirring needle and the peripheral structure must be completed , requires high machining precision and control precision

Method used

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  • Filling method for friction stir welding keyhole

Examples

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Effect test

Embodiment 1

[0034] A filling method of friction stir welding keyhole, the schematic diagram of the filling process is as follows figure 1 shown, including the following steps:

[0035] (1) Reaming the keyhole 3. The schematic diagram of the reaming process is shown in Figure (a). The alloy drill bit 2 is used to process the keyhole 3 into a cylindrical drill hole. According to the maximum diameter D1 of the keyhole, select the corresponding Alloy drill bit 2, the diameter D2 of alloy drill bit 2 is greater than D1 by more than 2mm, and entered into the cad model library. The depth is more than 2mm greater than the depth of the keyhole, to ensure that the drilling area completely covers the keyhole 3, and the schematic diagram of the state after reaming is shown in Figure (b);

[0036] (2) According to the cad model of the alloy drill bit 2 of D2 size entered in advance, convert it into an stl model, perform positioning, determine the manufacturing depth, define the scanning path, and fin...

Embodiment 2

[0039] A filling method of friction stir welding keyhole, the schematic diagram of the filling process is as follows figure 1 shown, including the following steps:

[0040] (1) Reaming the keyhole 3. The schematic diagram of the reaming process is shown in Figure (a). The alloy drill bit 2 is used to process the keyhole 3 into a cylindrical drill hole. According to the maximum diameter D1 of the keyhole, select the corresponding Alloy drill 2, alloy drill diameter D2 is greater than D12mm, and entered into the cad model library, when the surface wear caused by alloy drill 2 repeated use, re-measure the size of alloy drill 2, and update the cad model, the drilling speed of alloy drill 2 is 3000r / min, the diameter of the completed drilling hole is greater than the maximum diameter D1 of the keyhole by more than 2mm, and the depth of the drilling hole is greater than the depth of the keyhole by more than 2mm, ensuring that the drilling area completely covers the keyhole 3. The st...

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Abstract

The invention provides a filling method for a friction stir welding keyhole and belongs to the technical field of friction stir welding. The filling method concretely comprises the following steps: (1) performing reaming treatment of the keyhole, including machining the keyhole into a cylindrical dill hole with a drill bit and ensuring that the keyhole is completely covered by the area of the drill hole; (2) performing data conversion according to a cad model of the drill bit to generate a machining file; and (3) performing additive manufacturing of the drill hole according to the machining file, reclaiming an additive manufacturing material after the additive manufacturing is completed, and machining a surface to a smooth state to finish filling. The filling method provided by the invention realizes filling of the friction stir welding keyhole by an additive manufacturing technology, eliminates the influence of the keyhole on the performance of a weld, meanwhile can ensure an accurate filling process, has high filling efficiency and is applicable to keyholes in various different shapes; and the filling method is simple, can be implemented by conventional equipment and can be applied to industrial batch production.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of friction stir welding, and in particular relates to a filling method of a friction stir welding keyhole. [0003] Background technique: [0004] Friction stir welding (FSW) proposed by the British Welding Institute in 1991 is a new type of solid-phase welding technology, which has the advantages of high work efficiency, energy saving, no pollution, small welding deformation, and high weld quality. Aerospace, automobiles, ships, electronics and other fields have a wide range of application objects. For conventional friction stir welding, a keyhole will be left at the start of welding, which will reduce the effective width of the weld and reduce the mechanical properties. Therefore, the keyhole is an insurmountable "weakness" of conventional friction stir welding. [0005] At present, the elimination or filling methods of the friction stir welding keyhole are: (1) riveting method, the keyhole is pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 吕赞姬书得岳玉梅高双胜马琳
Owner SHENYANG AEROSPACE UNIVERSITY
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