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Laser-arc hybrid welding method for dissimilar aluminum alloy thin edge structure

A technology of dissimilar aluminum alloy and edge structure, applied in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of high welding production cost, high-power laser input and large welding structure assembly accuracy, etc., and achieve high welding efficiency. , avoid surface defects, reduce the effect of requirements

Active Publication Date: 2015-09-30
CAPITAL AEROSPACE MACHINERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The investment of high-power lasers is large, the assembly accuracy of welded structural parts is strict, and the welding production cost is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A laser-arc composite welding method for a heterogeneous aluminum alloy thin edge structure according to the present invention, the thickness of the heterogeneous aluminum alloy thin edge structure is within 3mm, which includes the following steps:

[0020] (1) Clean the surface to be welded of the thin edge structure of dissimilar aluminum alloys to be welded, one of which is Al-Mg-Si series cast aluminum alloy, and the other is Al-Mg series aluminum alloy, specifically: first use 40wt% NaOH solution is used to remove the oxide film by alkaline cleaning of the structure to be welded; then use 20wt% HNO 3 Pickle the structure to be welded with the solution; then wash the structure to be welded with clean water and dry it with compressed air;

[0021] (2) Welding the dissimilar aluminum alloy thin edge structure obtained after cleaning in step (1), specifically;

[0022] Laser-guided arc welding is used to weld the structure to be welded. The welding speed is 1mm / min, t...

Embodiment 2

[0027] A laser-arc composite welding method for a heterogeneous aluminum alloy thin edge structure according to the present invention, the thickness of the heterogeneous aluminum alloy thin edge structure is within 3mm, which includes the following steps:

[0028] (1) Clean the surface to be welded of the thin edge structure of dissimilar aluminum alloys to be welded, one of which is Al-Mg-Si series cast aluminum alloy, and the other is Al-Mg series aluminum alloy, specifically: first use 50wt% NaOH solution is used to remove the oxide film by alkaline cleaning of the structure to be welded; then use 25wt%HNO 3 Pickle the structure to be welded with the solution; then wash the structure to be welded with clean water and dry it with compressed air;

[0029] (2) Welding the dissimilar aluminum alloy thin edge structure obtained after cleaning in step (1), specifically;

[0030] Laser-guided arc welding is used to weld the structure to be welded, the welding speed is 2mm / min, th...

Embodiment 3

[0035] A laser-arc composite welding method for a heterogeneous aluminum alloy thin edge structure according to the present invention, the thickness of the heterogeneous aluminum alloy thin edge structure is within 3mm, which includes the following steps:

[0036] (1) Clean the surface to be welded of the thin edge structure of dissimilar aluminum alloys to be welded, one of which is Al-Mg-Si series cast aluminum alloy, and the other is Al-Mg series aluminum alloy, specifically: first use 60wt% NaOH solution is used to remove the oxide film by alkaline cleaning of the structure to be welded; then use 30wt%HNO 3 Pickle the structure to be welded with the solution; then wash the structure to be welded with clean water and dry it with compressed air;

[0037] (2) Welding the dissimilar aluminum alloy thin edge structure obtained after cleaning in step (1), specifically;

[0038] Laser-guided arc welding is used to weld the structure to be welded, the welding speed is 3mm / min, th...

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Abstract

The invention provides a laser-arc hybrid welding method for a special aluminum alloy thin edge structure. The method comprises the steps of (1) performing alkali washing on a structure to be welded by a NaOH solution to remove an oxidation film, performing acid washing on the structure to be welded by a HNO3 solution, then cleaning the structure to be welded by clean water, and drying the structure to be welded by compressed air; (2) welding the structure to be welded by adopting a laser guiding arc mode, wherein the welding speed is 1-3mm / min, the laser power is 500-2500W, the TIG arc current is 100-150A, the included angle between the TIG arc angle and the normal line is 35 degrees, the TIG arc height is 2-4mm, the laser arc heat source interval is 2-4mm, and the shielding gas is argon with the flow of 15-25L / min; and (3) cleaning the faces of the welding seams by using a steel brush. The stability in the welding process and the face quality of the welding seams are improved by adopting the laser-arc hybrid welding and optimized welding process, the assembly gap demand before welding is reduced and the structural deformation after welding is reduced.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and in particular relates to a laser-arc composite welding method for thin edge structures of dissimilar aluminum alloys with a thickness of less than 3mm. Background technique [0002] ZL114 is an Al-Mg-Si series cast aluminum alloy, which is widely used in the manufacture of spacecraft frame structures. LF6 is a commonly used deformed aluminum alloy among Al-Mg series aluminum alloys, which is widely used in spacecraft skins. ZL114-LF6 dissimilar aluminum alloys have broad application prospects in frame-skin composite structures. [0003] As an efficient, flexible and precise welding technology, laser welding technology has become one of the most advanced welding methods in the 21st century. However, the high reflectance of aluminum alloy to laser light and its own high thermal conductivity, especially for CO with a wavelength of 10.6 μm 2 The reflectivity of the laser is as high as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/348
Inventor 董鹏陈济轮陈靖王明梁晓康刘天亮何京文田彩兰
Owner CAPITAL AEROSPACE MACHINERY
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