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Method for laser welding Al-Mg alloy plates with different thicknesses

A technology of laser welding and welding method, which is applied in the direction of laser welding equipment, welding medium, welding equipment, etc., and can solve the problems of large gap between plates, poor weld formation, unevenness, etc.

Inactive Publication Date: 2008-02-27
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0002] When laser welding Al-Mg alloy plates with different thicknesses, due to the extremely high reflectivity of the surface of the Al-Mg alloy to the laser beam and the large amount of magnesium burning, the laser welding of the Al-Mg alloy itself is difficult; and due to human factors in the cleaning process The influence of the impact of the clamping error and the influence of the clamping error often make the surface state of the plate uneven, the gap between the plates is too large or uneven, and the laser beam is very sensitive to the surface state of the aluminum alloy and the gap between the plates, which makes the welding process extremely unstable. Stable, poorly formed welds

Method used

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Embodiment Construction

[0009] The added powder of the present invention is composed of Mg and Al, the particle size of the powder is 100-300 mesh, and the weight ratio is respectively: Mg accounts for 3-8%, and the rest is Al. The powder filling of the welding method adopts the preset method. Firstly, after mixing the powder, grind it for 15-30 minutes to make it evenly mixed, put it in a drying furnace and dry it at 100-180°C for 15-30 minutes, and then mix the powder with acetone or methyl ethyl ketone solvent, stir evenly and brush on the entire surface of the bead to be welded. The thickness of the coating is related to the thickness of the plate. The minimum thickness is suitable for covering the original metallic luster of the workpiece. Laser welding is performed after the solvent evaporates.

[0010] with CO 2 The laser is used for laser welding. When welding aluminum-magnesium alloy LF2 with a thickness of 1mm and 1.5mm, argon shielding gas is used on the front and back. The components of t...

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Abstract

A welding flux for the laser welding of Al-Mg alloy plate with variable thickness is prepared from Mg powder and Al powder through proportional mixing, grinding, baking at 100-180 deg.c, mixing with aceotne or butaneous and stirring. It is applied through coating it on the surface to be welded, volatilizing solvent and laser welding under protection of inertial gas.

Description

technical field [0001] The invention relates to welding filler powder and a welding method, and is especially suitable for laser welding of Al-Mg alloy plates with different thicknesses. Background technique [0002] When laser welding Al-Mg alloy plates with different thicknesses, due to the extremely high reflectivity of the surface of the Al-Mg alloy to the laser beam and the large amount of magnesium burning, the laser welding of the Al-Mg alloy itself is difficult; and due to human factors in the cleaning process The influence of the impact of the clamping error and the influence of the clamping error often make the surface state of the plate uneven, the gap between the plates is too large or uneven, and the laser beam is very sensitive to the surface state of the aluminum alloy and the gap between the plates, which makes the welding process extremely unstable. Stable, poorly formed welds. Contents of the invention [0003] The purpose of the invention is to improve ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28B23K101/10B23K26/20B23K1/005B23K26/323B23K26/60B23K35/24
CPCB23K26/203B23K26/211
Inventor 樊丁余淑荣陈剑虹王刚张建斌
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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