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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Problems solved by technology

The hardness of the galvanized layer is about 80HV. Compared with the magnesium alloy substrate, the hardness does

Method used

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  • Magnesium alloy surface SiC+Al pile up welding method

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Example Embodiment

[0018] Example 1

[0019] The wrought magnesium alloy AZ31B sheet with a thickness of 3.6mm is selected (sample size is 200×100×3.6mm), the particle size of aluminum powder and silicon carbide powder are both 7μm, 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 a binder and stir evenly, and evenly coat the coating material on the surface of a clean magnesium alloy workpiece that has been cleaned of oxide film and other impurities, with a coating thickness of 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 flow of the welding torch is 5L / min, and the welding torch angle (between the welding torch and the plane where the weld is located) The included angle) is 50°, and argon is us...

Example Embodiment

[0020] Example 2

[0021]Choose 8mm thick cast magnesium alloy AZ91B plate (sample size is 200×100×8mm), choose aluminum powder and silicon carbide powder with a particle size of 50μm, 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 a binder and stir evenly, and evenly coat the coating material on the surface of a clean magnesium alloy workpiece that has been cleaned of oxide film and other impurities, with a coating thickness of 0.5 mm. The welding current of argon tungsten arc welding is 130A (AC), the diameter of the tungsten electrode of the welding gun is F2.0mm, the welding speed is 10mm / s, the argon flow of the welding gun is 10L / min, and the angle of the welding gun (between the welding gun and the plane where the weld is The included angle) is 70°, and argon is used as the protective gas. Analysis o...

Example Embodiment

[0022] Example 3

[0023] Choose a 10mm thick cast magnesium alloy AM60 plate (sample size is 200×100×10mm), the selected aluminum powder and silicon carbide powder have a particle size of 100μm, 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 a binder and stir evenly, and evenly coat the coating material on the surface of a clean magnesium alloy workpiece that has been cleaned of oxide film and other impurities, with a coating thickness of 1.0 mm. The welding current of argon tungsten arc welding is 200A (AC), the diameter of the tungsten electrode of the welding gun is F2.2mm, the welding speed is 15mm / s, the argon flow of the welding gun is 15L / min, and the welding gun angle (between the welding gun and the plane where the weld is located) The included angle) is 90°, and argon is used as the protective gas....

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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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