Vacuum electron beam welding method for special-shaped complex large-thickness fuel loading bin

A vacuum electron beam and electron beam welding technology, applied in electron beam welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of difficult to achieve 8-10mm thick joint welding, difficult to control deformation, softening of heat affected zone, etc. , to achieve the effect of improving welding quality, preventing sag, and improving weld formation

Active Publication Date: 2019-01-25
BEIJING HANGXING MACHINERY MFG CO LTD
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AI Technical Summary

Problems solved by technology

For the welding of the fuel tank, the traditional argon arc welding method has the problems of large heat input, softening and deformation of the heat-affected zone, and it is difficult to control the deformation of the heat-affected zone; and laser welding is difficult to achieve welding of 8-10mm thick joints due to power limitations

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  • Vacuum electron beam welding method for special-shaped complex large-thickness fuel loading bin
  • Vacuum electron beam welding method for special-shaped complex large-thickness fuel loading bin

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Embodiment Construction

[0042] Below in conjunction with accompanying drawing and example, the invention is described further.

[0043] Taking an aircraft fuel tank as an example ( figure 1 ), consisting of 2 end frames, 1 casting and 2 skins. The material of the casting is ZL114A aluminum alloy, and the material of the end frame and skin is 5A06 aluminum alloy. The total length of the fuel tank is 1100mm, the diameter is 900mm, and the maximum thickness of the welded joint is 15mm.

[0044] Concrete implementation plan carries out according to the following steps:

[0045] Step 1: Preparation before welding;

[0046] Pickle the end frame and skin of the fuel tank to remove surface oil and oxide film, and dry it at 50-80°C for 20-30min. Use a wire brush to polish the end frame, skin and the casting area to be welded to a bright metallic luster, and wipe it clean with acetone;

[0047] Step 2: End frame and casting welding assembly;

[0048] Use the welding tool to assemble the two end frames an...

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Abstract

The invention discloses a vacuum electron beam welding method for a special-shaped complex large-thickness fuel loading bin. Before welding, acid pickling and mechanical grinding are adopted for a workpiece joint region, firstly, two end frames and a casting are assembled, and after completion, point fixing and normal welding are performed; then, two skins and an end frame are assembled, and pointfixation and normal welding are performed after completion; finally, point fixation and welding of a welding line are performed between the skins and the skin and the casting. In the welding process,upper-heater low-current electronic beams are adopted for point fixation, upper-heater large-current electronic beams are adopted for normal welding, and meanwhile X and Y direction beam flows are applied for scanning. The fuel bin welding line manufactured by adopting the welding method meets the requirement for GJB1718A-2005 'electron beam welding' first-stage joints, the welding deformation issmall, and the integrated profile tolerance is controlled within 1.5 mm.

Description

Technical field [0001] The invention belongs to the technical field of aluminum alloy electron beam welding, and relates to a vacuum electron beam welding method for fuel tanks with special shapes, complex shapes and large thickness. Background technique [0002] With the development of the aerospace industry, the dimensional accuracy of the aircraft has become higher and higher with the increase of flight speed, the requirement of stealth, and the need of aerodynamic shape. The important structural parts of aircraft such as fuel tanks have developed from the traditional "casting + welding" to the more lightweight "sheet metal + welding" structure. The structural parts also have regular shapes and gradually change to complex special-shaped structures. The connection between different materials and dissimilar materials, the weld form changes from regular straight welds and girth welds to space curve welds. Taking an aircraft fuel tank as an example ( figure 1 ), consisting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/06
CPCB23K15/0033B23K15/0053B23K15/06
Inventor 孙少波任金欣王毅李宏伟李保永王志敏
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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