A Method for Improving the Strength of Friction Stir Welded Joints of Al-Mg Alloy Sheets
An aluminum-magnesium alloy and friction stir technology, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of non-strengthened aluminum-magnesium alloy friction stir welding sheet strength, low weldment, no effective heat treatment, etc. problems, to achieve the effect of improving substructure strengthening, retaining fibrous tissue, and high dispersibility
Active Publication Date: 2022-05-24
CENT SOUTH UNIV
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However, similar to other welding methods, the strength of the plate after friction stir welding is still significantly lower than that of the base metal
[0003] At present, there is no method in the existing literature to effectively improve the strength of aluminum-magnesium alloy friction stir welded plates that cannot be strengthened by heat treatment
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[0028] The alloy composition used in the present invention is shown in the following table:
[0029] Table 1 Alloy composition (wt.%)
[0030]
[0031] The preparation method of the alloy sheet is as follows:
[0032] (1) Alloy raw materials are prepared according to the design components and smelted in a smelting furnace. Aluminum and magnesium elements are added with pure aluminum and pure magnesium, respectively, and other alloying elements are added with Al-8.5%Mn, Al-4.48%Zr, Al-2 %Sc and Al-4%Ti master alloys are added.
[0033] (2) Semi-continuous casting is carried out into flat ingots after melt refining and degassing;
[0034] (3) The ingot with Sc content of 0 was homogenized and heat-treated at 430-440 °C for 8 h, and then air-cooled; the ingot with Sc content not equal to 0 was homogenized and heat-treated at 300 °C, 350 °C and 440 °C for 8 h, and then air-cooled. air cooling;
[0035] (4) The homogenized ingot was heated at 410-430°C for 4 hours, and then ...
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Abstract
The invention relates to a method for improving the strength of a friction stir welding joint of an aluminum-magnesium alloy thin plate, belonging to the technical field of metal material welding. The invention takes the aluminum-magnesium alloy ingot containing Sc and Zr as the processing object, and performs homogenization treatment on the ingot at 280-440°C; after the homogenization treatment, it is hot-rolled and cold-rolled in sequence, and the cold-rolled plate is stabilized and annealed Finally, after calendering and straightening, the finished sheet is obtained, and then the finished sheet is friction stir welded to obtain the welded product. Welded products do not require subsequent heat treatment to ensure that the substrate and welded joints have good mechanical properties. The preparation process of the invention is simple and controllable, the obtained product has excellent performance, and is convenient for industrial application.
Description
technical field [0001] The invention relates to a method for improving the strength of a friction stir welded joint of an aluminum-magnesium alloy sheet, and belongs to the technical field of metal material welding. Background technique [0002] Aluminum-magnesium alloys have the advantages of high specific strength and good weldability, and are often used as load-bearing welding components for ships and spacecraft. Friction stir welding technology is a new type of semi-solid joining technology that can achieve high-quality joining of aluminum sheets. However, similar to other welding methods, the strength of the weldment after friction stir welding of plates is still significantly lower than that of the base metal. [0003] At present, there is no method for effectively improving the strength of the aluminum-magnesium series alloy friction stir welded sheet that cannot be strengthened by heat treatment in the existing literature. SUMMARY OF THE INVENTION [0004] Aiming...
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IPC IPC(8): B23K20/12B23K20/24B23P15/00C22C1/02C22C21/06C22F1/047
CPCB23P15/00B23K20/1245B23K20/24C22C1/026C22C21/06C22F1/047
Inventor 邓英朱鑫文杨子昂刘正辉
Owner CENT SOUTH UNIV