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Friction welding process for airtight oil tank structural component

A technology for friction welding and structural parts, which is applied in welding equipment, manufacturing tools, non-electric welding equipment, etc.

Inactive Publication Date: 2012-02-15
JIANGXI HONGDU AVIATION IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the special use requirements of the fuel tank, such as the thickness of the ribs in the fuel tank and the wall of the fuel tank is inconsistent, the traditional friction stir welding is only used for the application of butt welding of flat parts; and argon arc welding or other shielded welding methods are used. , can not guarantee the realization of the airtight design requirements of the weld, and it is easy to cause deformation after welding

Method used

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  • Friction welding process for airtight oil tank structural component
  • Friction welding process for airtight oil tank structural component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: The friction welding process of the structural parts of the gas-tight fuel tank adopts friction stir welding after overlapping between the skin 1 and the frame 2, which is different from the traditional friction stir welding after butt joint of the base metal.

[0026] The ring-shaped frame is designed as a frame 2 with a web in the middle. The frame section is circular and machined, and the skin 1 is a sheet metal part, which is punched into a cylindrical shape through a die.

[0027] According to the friction stir welding welding joint type of the fuel tank, and in order to ensure the welding quality, the weld zone 3 is formed at the welding place between the fuel tank frame 2 and the skin 1 (circumferential seam), and the process steps are as follows:

[0028] 1) Perform chemical milling on the welding area of ​​skin 1 to increase the thickness of the welding area of ​​skin 1 by 10 mm;

[0029] 2) Select the test piece before welding to set various par...

Embodiment 2

[0036] Example 2: The friction welding process of airtight fuel tank structural parts, the process steps are as follows:

[0037] 1) Perform chemical milling on the welding area of ​​skin 1 to increase the thickness of the welding area of ​​skin 1 by 8mm;

[0038] 2) Select the test piece before welding to set various parameters (thickness of the test piece material, travel speed of the welding machine and rotation speed of the stirring head);

[0039] 3) Put the skin 1 on the outside of the frame 2, clamp the ring frame 2 and the skin 1 with clamps, and keep the pressure block as close as possible to the weld seam. Since the shaft shoulder of the stirring head is φ10㎜, the gap between the left and right pressure blocks is 2.5mm respectively. ㎜, in order to ensure the welding quality during welding, the distance between the pressing blocks is 15㎜;

[0040] 4) After clamping, measure the concentricity of each weld to be welded, that is, the gap between the skin and the comp...

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Abstract

The invention discloses a friction welding process for an airtight oil tank structural component. An annular frame in an airtight oil tank is designed as a frame with a web plate in the middle; a cross section of the frame is circle-shaped; a sheet metal part is taken as an oil tank cover; and the oil tank cover is stamped into a cylindrical oil tank cover. Stirring friction welding is adopted after a cylinder and the frame are lap-jointed. During a welding process, a stirring head speedily rotates at a certain speed and a welded piece on a fixture has a rotary motion relative to the stirring head, thereby realizing axial welding of the oil tank.

Description

technical field [0001] The invention relates to the field of welding technology, belongs to friction welding which generates heat by friction, and in particular relates to a friction welding process of an airtight oil tank structural part. Background technique [0002] The fuel tank of an aviation vehicle not only needs to withstand a large external load, but also needs to withstand a certain internal pressure, and at the same time, it needs to supply fuel in sections. The airtightness of each compartment and the entire cabin in the fuel tank is high. Therefore, it is necessary to adopt a forming process that meets the requirements of various aspects of the fuel tank. The use of welded fuel tanks with good airtight performance has become an inevitable choice. According to the special use requirements of the fuel tank, such as the thickness of the ribs in the fuel tank and the wall of the fuel tank is inconsistent, the traditional friction stir welding is only used for the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12
Inventor 梁可人黄海龙毛端华王再玉刘慧慧蒋若冰孙启星潘海华
Owner JIANGXI HONGDU AVIATION IND GRP