Laser welding method capable of refining aluminum alloy weld joint structure

A technology of laser welding and aluminum alloy, which is applied in the direction of laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of limited welding product size and structural form, unsatisfactory effect, poor applicability, etc.

Inactive Publication Date: 2019-01-11
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Commonly used welding methods TIG and MIG welding can obtain high-quality aluminum alloy welded joints, but their production efficiency is low, welding deformation and other problems are very prominent; in recent years, advanced welding methods such as laser welding, electron beam and friction stir welding have been put into use one after another. The effect is also not very ideal
Electron beam and friction stir welding are limited by the size and structure of the welded product, and their applicability is not strong

Method used

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  • Laser welding method capable of refining aluminum alloy weld joint structure
  • Laser welding method capable of refining aluminum alloy weld joint structure
  • Laser welding method capable of refining aluminum alloy weld joint structure

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weld the LF6 aluminum alloy butt joint structure.

[0023] Before laser welding, clean up the scale, oil and other impurities within the range of (20-50) mm from the center of the weld; during welding, the swing path of the laser beam is a sinusoidal path, such as figure 1 As shown, the swing amplitude H is 2 mm, the swing frequency is 300 Hz, and other welding process parameters are the same as conventional laser welding process parameters.

[0024] The results show that: the central structure of conventional laser welding seam of 5A06 aluminum alloy is equiaxed crystal and coarse dendrite, and there are still more dendrites in the central structure of sinusoidal laser swing welding seam, but it is more dense than that of conventional laser welding seam. A certain degree of refinement.

Embodiment 2

[0026] Weld the LF6 aluminum alloy butt joint structure.

[0027] Before laser welding, clean up the scale, oil and other impurities within the range of (20-50) mm from the center of the weld; during welding, the swing path of the laser beam is a spiral path, such as figure 2 As shown, the swing amplitude H is 2 mm, the swing frequency is 300 Hz, and other welding process parameters are the same as conventional laser welding process parameters.

[0028] The results show that the central microstructure of 5A06 aluminum alloy conventional laser welding seam is equiaxed crystal and coarse dendrite, while the central microstructure of helical laser swing welding seam still has dendrite structure, which is finer than that of conventional laser welding seam central microstructure.

Embodiment 3

[0030] Weld the LF6 aluminum alloy butt joint structure.

[0031] Weld the LF6 aluminum alloy butt joint structure.

[0032] Before laser welding, clean up the scale, oil and other impurities within the range of (20-50) mm from the center of the weld; during welding, the swing path of the laser beam is a double-helix path, such as image 3 As shown, the swing amplitude H is 2 mm, the swing frequency is 300 Hz, and other welding process parameters are the same as conventional laser welding process parameters.

[0033] The results show that: the central structure of conventional laser welding seam of 5A06 aluminum alloy is equiaxed crystal and coarse dendrite, and the central structure of double helix laser swing welding seam is all equiaxed crystal without dendrite structure. Noticeable refinement of central tissue occurs.

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Abstract

The invention discloses a laser welding method capable of refining an aluminum alloy weld joint structure. The method mainly comprises the steps that before welding, scale and oil stain around the center of a weld joint are removed, a butt-joint end face of the weld joint is scraped through a scraper until a bright white metal body is exposed, then acetone is used for wiping and cleaning, and aluminum alloy is welded through periodic oscillating laser beam, wherein in the laser oscillating welding process, a laser heat source periodically oscillates in a weld pool according to different oscillating modes, thus, large temperature gradient changes occur in the weld pool, surface tension of the weld pool is affected, and the functions of stirring the weld pool and refining crystal grains areachieved. Meanwhile, in the beam periodic scanning process, the solidified weld joint is remelted, and the weld joint structure is refined. The weld joint structure can be effectively refined, and theweld joint with excellent comprehensive mechanical properties is obtained.

Description

Technical field [0001] The invention belongs to the field of welding technology, and relates to a laser welding method capable of refining the weld seam structure of an aluminum alloy. Background technique [0002] Aluminum alloy has low material density, high strength, high thermal conductivity, strong corrosion resistance, and good physical and mechanical properties, so it is widely used in welding structures of industrial products, especially aerospace products. [0003] Commonly used welding methods TIG and MIG welding can obtain high-quality aluminum alloy welded joints, but their production efficiency is low, welding deformation and other problems are very prominent; in recent years, advanced welding methods such as laser welding, electron beam and friction stir welding have been put into use one after another. The effect is also not very ideal. Electron beam and friction stir welding are limited by the size and structure of the welded product, so their applicability ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/60B23K26/08B23K103/10
CPCB23K26/0876B23K26/21B23K26/60
Inventor 曲宏韬步贤政胡文浩胡洋宋海勇游东洋周海波韩维群姚为
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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