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Method for improving corrosion performance of surface of light alloy friction-stir welding joint

A friction stir and welded joint technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problem of low interface strength, and achieve the effect of improving joint performance, joint structure strengthening, and improving mechanical properties and stability.

Inactive Publication Date: 2018-09-07
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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Problems solved by technology

Since the interface bonding of the cold spray coating is basically mechanical interlocking, the interface strength is not high

Method used

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  • Method for improving corrosion performance of surface of light alloy friction-stir welding joint
  • Method for improving corrosion performance of surface of light alloy friction-stir welding joint

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0019] 1) According to the method of the present invention, first, the 6mm thick AZ91E magnesium alloy is subjected to friction stir welding, the welding speed is 100mm / min, the rotation speed of the stirring head is 500r / min, and the downward pressure is controlled to 0.2mm.

[0020] 2) Subsequently, the welding surface is subjected to cold spraying treatment, and the spraying particles are pure aluminum-alumina mixed particles, wherein the pure aluminum particles account for 50%, and the aluminum oxide particles account for 50%. The particle size is 20-30μm, the powder feeding rate is 30g / min, the powder feeding distance is 25mm, and the final coating thickness is 2mm.

[0021] 3) For the post-weld heat treatment of the cold spray coating, the heat treatment temperature is 400°C, the heat treatment time is 2h, the heat treatment atmosphere is an argon envir...

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Abstract

The invention discloses a method for improving the corrosion performance of the surface of a light alloy (including an aluminum alloy, a magnesium alloy and a titanium alloy) friction-stir welding joint. The method mainly comprises the steps that the surface of the joint being subjected to friction-stir welding is subjected to sand blasting treatment and cold spraying treatment, and then the coldspraying surface is subjected to further treatment through a heat treatment method; and on the one hand, residual stress caused by welding is eliminated, on the other hand, element diffusion occurs ata coating / joint interface, a transition layer is formed, interfacial binding force of a cold spraying coating is improved, and finally, a layer of dense protective layer is formed on the surface of the joint. The method for improving the corrosion performance of the surface of the light alloy friction-stir welding joint is easy to operate, convenient to use, reliable in performance, economical and practical, the corrosion performance of the surface of the friction-stir welding joint can be remarkably improved, and great significance to practical application of friction-stir welding is achieved.

Description

technical field [0001] The invention belongs to the technical field of material connection, and in particular relates to a method for improving the surface corrosion performance of light alloy friction stir welding joints. Background technique [0002] Friction stir welding (FSW) is a solid phase joining technology invented by the British Welding Institute (TWI) in 1991. This technology has the advantages of high joint quality, small welding deformation, small residual stress, green welding process, and no pollution. It is the preferred welding method for light alloys such as aluminum and magnesium, and is widely used in aerospace, rail transportation, marine ships and other fields. FSW welds can be divided into four different areas from the organization: weld nugget zone (weld nugget zone, WNZ), thermomechanically affected zone (thermo-mechanically affected zone, TMAZ), heat-affected zone (heat-affected zone, HAZ) And the shoulder affected zone (should-affected zone, SAZ),...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/24
CPCB23K20/122B23K20/1275B23K20/24
Inventor 崔冰赵常宇张华刘德博王非凡张巍
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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