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B4C+Al bead welding remelting method for magnesium alloy surface

A magnesium alloy, remelting technology, used in welding equipment, arc welding equipment, metal processing equipment, etc., can solve the problems of insignificant increase in hardness, hardness does not meet the requirements, etc., to improve the mechanical and chemical properties of the surface layer, all-round The effect of surfacing remelting and automatic operation

Inactive Publication Date: 2005-09-28
SHANGHAI HAOHUA MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hardness of the galvanized layer is about 80HV. Compared with the magnesium alloy substrate, the hardness does not increase significantly, and the hardness still does not meet the requirements for general structural materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The deformed magnesium alloy AZ31B plate with a thickness of 3.6mm (sample size is 200×100×3.6mm), the particle size of aluminum powder and boron carbide powder are both 7 μm, and the mixing volume ratio of boron carbide powder and aluminum powder is: Boron carbide powder: aluminum powder = 1:5, and the binder used is polyvinyl butyral. Fully mix boron carbide powder and aluminum powder, add binder and stir evenly, apply the coating material evenly on the surface of the clean magnesium alloy workpiece that has been cleaned of impurities such as oxide film, and the coating thickness is 0.1mm. The welding current of argon tungsten arc welding is 60A (AC). The included angle) is 50°, and argon is used as the shielding gas. The surface analysis of the magnesium alloy after surfacing-remelting treatment shows that the thickness of the fusion layer is 0.5mm, B 4 C particles are evenly embedded on the surface of the magnesium alloy substrate, and the microhardness is 120VHN....

Embodiment 2

[0023] The cast magnesium alloy AZ91B plate with a thickness of 8mm is selected (the sample size is 200×100×8mm), the particle size of aluminum powder and boron carbide powder are both 50 μm, and the mixing volume ratio of boron carbide powder and aluminum powder is: boron carbide powder : Aluminum powder = 1: 3.5, the binder used is polyvinyl butyral. Fully mix boron carbide powder and aluminum powder, add binder and stir evenly, apply the coating material evenly on the surface of the clean magnesium alloy workpiece that has been cleaned of impurities such as oxide film, and the coating thickness is 0.5mm. The welding current of argon tungsten arc welding is 130A (AC). The included angle) is 70°, and argon is used as the shielding gas. The surface analysis of the magnesium alloy after surfacing-remelting treatment shows that the thickness of the fusion layer is 1.3mm, B 4 C particles are evenly embedded on the surface of the magnesium alloy substrate, and the microhardness ...

Embodiment 3

[0025] The cast magnesium alloy AM60 plate with a thickness of 10mm is selected (the sample size is 200×100×10mm), the particle size of aluminum powder and boron carbide powder are both 100 μm, and the mixing volume ratio of boron carbide powder and aluminum powder is: boron carbide powder : Aluminum powder = 1: 2, the binder used is polyvinyl butyral. Fully mix boron carbide powder and aluminum powder, add binder and stir evenly, and apply the coating material evenly on the surface of the clean magnesium alloy workpiece that has removed impurities such as oxide film, and the coating thickness is 1.0mm. The welding current of argon tungsten arc welding is 200A (AC), the diameter of the tungsten electrode of the welding torch is 2.2mm, the welding speed is 15mm / s, the argon gas flow rate of the welding torch is 15L / min, the angle of the welding torch (the distance between the welding torch and the plane where the welding seam is located The included angle) is 90°, and argon is ...

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Abstract

The present invention relates to welding technology, and is B4C+Al bead welding re-melting method for magnesium alloy surface. The present invention has the following steps: 1) treating magnesium alloy workpiece surface via grinding, eliminating oxide, flushing with anhydrous alcohol and drying in the air; 2) mixing B4C and Al powder, and adding PVB via stirring to obtain coating material; 3) painting the compounded coating material onto the surface of magnesium alloy workpiece, and drying naturally or stoving; and 4) tungsten electrode arc welding and re-melting of the magnesium alloy workpiece surface under the protection of inert gas. The present invention can raise the surface hardness, wear resistance and corrosion resistance, and has simple equipment, easy operation, low production cost and other advantages.

Description

technical field [0001] The invention relates to a magnesium alloy surface surfacing remelting method, in particular to a magnesium alloy surface B 4 The C+Al surfacing remelting method is used in the field of welding technology. Background technique [0002] Magnesium and magnesium alloys have light specific gravity, and magnesium alloy has high specific strength and specific stiffness, good thermal and electrical conductivity, good damping and shock absorption and electromagnetic shielding performance, and is easy to process and shape, easy to recycle waste, and less environmental pollution. Replace steel and aluminum alloy structural parts in aviation, transportation and other industries, thereby reducing weight and improving energy efficiency. However, magnesium alloy has low hardness, poor wear resistance, active chemical properties, and no corrosion resistance, which greatly limits its application range. Ceramic materials can be used as the surface coating of the work...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/16
Inventor 丁文斌蒋海燕曾小勤姚寿山丁文江吴国松
Owner SHANGHAI HAOHUA MOLD
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