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A kind of friction stir welding method of aluminum alloy thick plate

A technology of friction stir welding and aluminum alloy, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems that the gap between workpieces to be welded is difficult to guarantee and FSW is difficult, and it can solve the problem that the gap between groups is difficult to control , reduce requirements and prolong service life

Active Publication Date: 2017-10-03
CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the FSW of aluminum alloy thick plates is difficult, especially the problem that it is difficult to ensure the gap between the workpiece groups to be welded when the welding is plunged into and FSW, and proposes a kind of FSW welding that is pre-welded in advance and side-positioned. new method

Method used

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  • A kind of friction stir welding method of aluminum alloy thick plate
  • A kind of friction stir welding method of aluminum alloy thick plate
  • A kind of friction stir welding method of aluminum alloy thick plate

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Experimental program
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Effect test

Embodiment 1

[0023] Both the aluminum alloy workpiece 1 and the aluminum alloy workpiece 2 to be welded are 6005A-T6 aluminum alloy profiles with a thickness of 35 mm. Oxide film on the side, and then achieve a good fit between workpiece 1 and workpiece 2. A stirring head with a shaft shoulder diameter of 15 mm, a stirring pin length of 5 mm, a root diameter of 6 mm, and an end diameter of 3.5 mm is selected for FSW pre-assembly welding, and the pre-assembly welding seam 3 is formed. The shoulder diameter of the welding stirring head 5 is 45 mm, the length of the stirring pin is 34 mm, the root diameter is 30 mm, and the end diameter is 8 mm. Use a drill bit with a diameter of 19mm to drill a hole at a distance of 35mm from the end of the workpiece 1 and from the center of the pre-assembled weld 3. The drilling depth is 17mm, and then form the welding start hole 4. Finally, use the welding stirring head 5 to pierce the starting welding at the welding opening 4, and advance along the direc...

Embodiment 2

[0025] Both the aluminum alloy workpiece 1 and the aluminum alloy workpiece 2 to be welded are 6005A-T6 aluminum alloy profiles with a thickness of 35 mm. Oxide film on the side, and then achieve a good fit between workpiece 1 and workpiece 2. A stirring head with a shaft shoulder diameter of 15 mm, a stirring pin length of 5 mm, a root diameter of 6 mm, and an end diameter of 3.5 mm is selected for FSW pre-assembly welding, and the pre-assembly welding seam 3 is formed. The shoulder diameter of the welding stirring head 5 is 45 mm, the length of the stirring pin is 34 mm, the root diameter is 30 mm, and the end diameter is 8 mm. Use a drill bit with a diameter of 19mm to drill a hole at a distance of 35mm from the end of the workpiece 1 and from the center of the pre-assembled weld 3. The drilling depth is 13.6mm, and then form the welding start hole 4. Finally, use the welding stirring head 5 to pierce the starting welding at the welding opening 4, and advance along the dir...

Embodiment 3

[0027] Both the aluminum alloy workpiece 1 and the aluminum alloy workpiece 2 to be welded are 6005A-T6 aluminum alloy profiles with a thickness of 35 mm. Oxide film on the side, and then achieve a good fit between workpiece 1 and workpiece 2. A stirring head with a shaft shoulder diameter of 15 mm, a stirring pin length of 5 mm, a root diameter of 6 mm, and an end diameter of 3.5 mm is selected for FSW pre-assembly welding, and the pre-assembly welding seam 3 is formed. The shoulder diameter of the welding stirring head 5 is 45 mm, the length of the stirring pin is 34 mm, the root diameter is 30 mm, and the end diameter is 8 mm. Use a drill bit with a diameter of 19mm to drill a hole at a distance of 35mm from the end of the workpiece 1 and from the center of the pre-assembled weld 3. The drilling depth is 20.4mm, and then form the welding start hole 4. Finally, use the welding stirring head 5 to pierce the starting welding at the welding opening 4, and advance along the dir...

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Abstract

An aluminum alloy thick plate friction stir welding method is characterized in that through FSW advanced installing and welding, a workpiece to be welded is partly welded and connected; holes are drilled in one side of a weld joint so that welding can be started conveniently on one side of the weld joint; welding is started on one side of the drilled holes, and full-penetration FSW welding is conducted on the center of the advanced installing and welding weld joint after a stirring head moves to the center of the actual weld joint perpendicularly. The invention develops and provides a new FSW welding method where welding is advanced and started after holes are drilled in one side, and the method is particularly applicable to FSW welding of aluminum alloy thick plates. The method is simple in process, and the problem that in the FSW welding starting and welding process of the aluminum alloy thick plates, assembly intervals are hard to control can be effectively solved. The method is stable in technological process and suitable for industrial batched production. The requirement of aluminum alloy thick plate FSW for rigidity of device main shafts and keels is lowered, the requirement for tool clamps is lowered as well, and the service life of the stirring head can be effectively prolonged.

Description

technical field [0001] The invention relates to a friction stir welding method of aluminum alloy, which is especially suitable for welding thick plate aluminum and aluminum alloy materials. Background technique [0002] Aluminum alloy has the advantages of high specific strength, easy forming, good corrosion resistance, and renewable materials, and has become one of the main materials for rail vehicle manufacturing. In the manufacture of high-speed railway vehicles, it plays an irreplaceable role for other materials. At present, in the processing and manufacturing of rail vehicles, the welding of aluminum alloys is still dominated by conventional fusion welding such as melting inert gas shielded welding (abbreviated as MIG welding) and tungsten inert gas shielded welding (abbreviated as TIG welding). However, due to the high thermal conductivity and active chemical properties of aluminum alloy, oxide film is easy to form on the surface, and defects such as pores, inclusions...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12
CPCB23K20/122
Inventor 张欣盟张行毛一伟
Owner CRRC CHANGCHUN RAILWAY VEHICLES CO LTD