Method for improving corrosion resistance of aluminum alloy friction stir welding welded joint
A technology of friction stir welding and welded joints, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc. The effect has strong stability, reliable performance, and the effect of improving the bonding strength of the interface
Inactive Publication Date: 2018-04-27
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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However, the heat treatment process will be limited by equipment, large structural parts cannot be used, and the treatment process is more complicated, the treatment time is longer, and the heating and cooling process is difficult to accurately control, so this treatment method has great instability.
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Embodiment 1
[0030] Such as figure 1 and figure 2 As shown, a method for improving the corrosion resistance of aluminum alloy friction stir welding welded joints is used to process 6mm thick 2219 aluminum alloy welded joints, which specifically includes the following steps:
[0031] Step A: Perform sand blasting on the welded joint 1 of 2219 aluminum alloy after friction stir welding. The working gas for sand blasting is compressed air with a pressure of 0.8Mpa. Among them, the friction stir welding is to perform friction stir welding on the 6mm thick 2219 aluminum alloy welded joints, 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.
[0032] Step B. Connect the two ends of the 2219 aluminum alloy welded joint 1 after sand blasting to the positive and negative electrodes of the power supply, so as to perform resistance heating on the 2219 aluminum alloy welded joint 1 to make its temperature reach 500°C...
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Abstract
The invention discloses a method for improving the corrosion resistance of an aluminum alloy friction stir welding welded joint. The method comprises the steps that resistance heating is performed onthe aluminum alloy welded joint which is welded utilizing the friction stir welding, the temperature of the aluminum alloy welded joint is made to reach 500 DEG C, then cold spraying surface treatmentis performed on the aluminum alloy welded joint utilizing cold spraying particles with the particle size being 20-30 microns, the powder feeding rate is 30 g / min, the powder feeding distance is 25 mm, and a cold spraying layer with the thickness being 2 mm is made to form at the aluminum alloy welded joint; and friction stir treatment is performed on the cold spraying layer at the aluminum alloywelded joint, the length of a stir-welding head is 2.5 mm, the welding speed is 30 mm / min, the welding rotating speed is 500 r / min, and the amount of indentation is 0.2 mm. By means of the method forimproving the corrosion resistance of the aluminum alloy friction stir welding welded joint, the corrosion resistance of the friction stir welding welded joint can be conveniently and effectively improved, the service life of the friction stir welding welded joint is prolonged, and the treatment method is simple and easy to realize, the treatment effect is high in stability, performance is reliable, and the method for improving the corrosion resistance of the aluminum alloy friction stir welding welded joint is economical and practical.
Description
technical field [0001] The invention relates to the technical field of metal material connection, in particular to a method for improving the corrosion resistance of aluminum alloy friction stir welding joints. Background technique [0002] Friction stir welding (Friction Stir Welding, FSW) is a solid phase welding technology invented by The Welding Institute in 1991. It uses a special form of stirring head to advance while rotating, and generates heat through the friction between the stirring head and the workpiece. The friction heat makes the metal in this part in a thermoplastic state, and under the pressure of the stirring head, it is plastic from the front to the rear. flow, so that the parts to be welded are pressure-welded as a whole. Compared with traditional welding methods, friction stir welding has the advantages of high joint quality, small welding deformation, small residual stress, and no pollution in the welding process. It is the preferred welding method for...
Claims
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IPC IPC(8): B23K20/12B23K20/24C23C24/04
CPCB23K20/122B23K20/24C23C24/04
Inventor 张华赵常宇崔冰常志龙窦程亮
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY