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Magnesium alloy surface SiC+Al pile up welding method

A magnesium alloy and workpiece surface technology, applied in welding equipment, arc welding equipment, metal processing equipment, etc., can solve the problems of insignificant increase in hardness and failure to meet the requirements, and achieve easy control of welding process parameters and comprehensive stacking The effect of welding remelting and reasonable process design

Inactive Publication Date: 2005-05-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Magnesium alloy surface SiC+Al pile up welding method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] A deformed magnesium alloy AZ31B plate with a thickness of 3.6mm is selected (the sample size is 200×100×3.6mm), the particle size of aluminum powder and silicon carbide powder are both 7 μm, and the mixing volume ratio of silicon carbide powder and aluminum powder is: Silicon carbide powder: aluminum powder = 1:5, and the binder used is polyvinyl butyral. Fully mix silicon 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 diameter of the tungsten electrode of the welding torch is F1.6mm, the welding speed is 5mm / s, the argon gas flow rate of the welding torch is 5L / min, the angle of the welding torch (between the welding torch and the plane where the welding seam is located The included angle) is 50°, and argon i...

Embodiment 2

[0021]A 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 silicon carbide powder are both 50 μm, and the mixing volume ratio of silicon carbide powder and aluminum powder is: silicon carbide powder : Aluminum powder = 1: 3.5, the binder used is polyvinyl butyral. Fully mix silicon 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 the argon tungsten arc welding is 130A (AC), the diameter of the tungsten electrode of the welding torch is F2. 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, SiC particles are evenly embedde...

Embodiment 3

[0023] The casting 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 silicon carbide powder are both 100 μm, and the mixing volume ratio of silicon carbide powder and aluminum powder is: silicon carbide powder : Aluminum powder = 1: 2, the binder used is polyvinyl butyral. Fully mix silicon 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 1.0mm. The welding current of argon tungsten arc welding is 200A (AC), the diameter of the tungsten electrode of the welding torch is F2.2mm, the welding speed is 15mm / s, the argon flow rate of the welding torch is 15L / min, the angle of the welding torch (between the welding torch and the plane where the welding seam is located The included angle) is 90°, and argon is u...

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Abstract

A technology for the build-up welding of SiC+Al on the surface of Mg alloy includes abrasing the surface of Mg-alloy workpiece for removing oxide, flushing with alcohol, drying in air, coating the mixture of SiC particles, Al particles and adhesive, baking, and tungsten arc build-up welding under protection of inertial gas. Its advantages are high hardness and antiwear-anticorrosion nature of welded surface and low cost.

Description

technical field [0001] The invention relates to a magnesium alloy surface remelting surfacing welding method, in particular to a magnesium alloy surface SiC+Al surfacing welding method, which 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 th...

Claims

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Application Information

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IPC IPC(8): B23K9/04B23K9/16B23K9/235
Inventor 丁文斌蒋海燕姚寿山曾小勤丁文江吴国松
Owner SHANGHAI JIAO TONG UNIV
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