Aluminum alloy stirring friction welding defect repairing method

A welding defect and friction stirring technology, which is applied in welding equipment, welding/welding/cutting items, non-electric welding equipment, etc., can solve problems such as broken stirring needles and buried stirring needles, and achieves simple operation, strong practicability and economy high effect

Active Publication Date: 2014-05-14
CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the front-end stirring pin of the stirring head is broken abnormally during the friction stir welding process of aluminum alloy, and the broken stirring pin is buried inside the weld due to failure to find out in time, and proposes a method that can accurately determine where the stirring pin is buried. The position of the broken stirring needle in the weld, and formulate a corresponding solution for this problem

Method used

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  • Aluminum alloy stirring friction welding defect repairing method
  • Aluminum alloy stirring friction welding defect repairing method
  • Aluminum alloy stirring friction welding defect repairing method

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Embodiment Construction

[0022] combine figure 1 , figure 2 , image 3 and Figure 4 , the aluminum alloy workpiece 2 to be welded and the aluminum alloy workpiece 3 are both 6082 aluminum alloy plates with a plate thickness of 12mm (heat treatment state is T6). The oxide film on the upper surface and side of workpiece 2 and workpiece 3, and then achieve a good combination between workpiece 2 and workpiece 3. The stirring head 1 used is composed of a clamping area 1-1, a shaft shoulder 1-2 and a stirring pin 1-3. Set the axial direction of the stirring head 1 and the surface normal direction of the aluminum alloy workpiece 2 and workpiece 3 to be welded to form a forward inclination angle of 2.5°. Start the friction stir welding equipment so that the stirring head 1 reaches a set speed of 450 rpm. The stirring head 1 penetrates into the weld seam 4 between the aluminum alloy workpiece 2 and the workpiece 3 to be welded at a speed of 0.3mm / s until the shoulder 1-2 of the stirring head 1 is presse...

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Abstract

The invention discloses an aluminum alloy stirring friction welding defect repairing method. The embedding position of a stirring needle in an aluminum alloy stirring friction welding seam is determined and judged through the method that a magnet block is hung below a spring scale. The fractured stirring needle is taken out of the welding seam through a pneumatic milling cutter, an electric hand drill and long flat nose pliers which are used in a coordination mode. Then, non-consumable electrode metal-inert gas welding (MIG welding) is used for filling excavation positions lacking materials. Finally, the stirring friction welding method is used for final welding repair on the problem welding seam. The method is simple in operation, easy to achieve, high in economy, practical and remarkable in actual project application meaning.

Description

technical field [0001] The invention relates to a method for repairing friction stir welding defects, which is suitable for the failure of the stirring needle at the front end of the stirring head to be broken and buried in the welding seam during the friction stir welding process of aluminum alloy. Position determination, extraction and final repair of welds. Background technique [0002] With the rapid development of the rail vehicle manufacturing industry, especially in the context of the global energy crisis, lightweight design has become the mainstream. Because aluminum alloy materials have excellent physical and mechanical properties such as low density, high specific strength, easy forming, and corrosion resistance, they have been widely used in the processing and manufacturing of rail vehicle bodies. In the current manufacturing of aluminum alloy car bodies, the welding method is mainly Metal Inert-gas Welding (MIG). However, because the aluminum alloy is easily ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/24B23K20/26
CPCB23K20/1225B23K20/26B23K2103/10
Inventor 杨景宏张欣盟闫占奇夏常青
Owner CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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