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Online cold spraying protecting and improving technology of weld joint in friction stir welding

A technology of friction stir welding and friction stir, which is applied in the field of aerospace, can solve the problems of brittle coatings, weak bonding between coatings and substrates, easy peeling, poor improvement of structural mechanical properties, etc., to reduce oxidation problems and reduce oxidation residues The risk of material damage and the effect of improving the quality of joints

Pending Publication Date: 2018-08-10
BEIJING INST OF ASTRONAUTICAL SYST ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cold sprayed metal coatings (especially aluminum coatings) also have the following key problems: the coating is brittle, the coating is weakly bonded to the substrate, and it is prone to peeling off in a stressed environment, and when using a single pure aluminum cold spraying, only It can improve the corrosion resistance, but the effect of improving the mechanical properties of the structure is poor
[0005] For the above-mentioned problems of finding a method that is more suitable for corrosion protection and mechanical performance enhancement of friction stir welded joints, no effective solution has been proposed so far

Method used

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  • Online cold spraying protecting and improving technology of weld joint in friction stir welding
  • Online cold spraying protecting and improving technology of weld joint in friction stir welding
  • Online cold spraying protecting and improving technology of weld joint in friction stir welding

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Effect test

Embodiment 1

[0067] Such as figure 1 , figure 2 As shown, the implementation steps of the on-line cold spray protection and enhancement technology for the friction stir welding seam described in this embodiment mainly include:

[0068] Step 1, preparation before welding, cleaning the surface of the workpiece 4 to be welded, and fixing and pressing it on the fixture;

[0069] Step 2, pre-spraying local thickening, the online local thickening cold spraying spray gun 2 in front of the mixing head 1 starts to work first, sprays along the path to be welded, and prepares a certain thickness of coating, that is, the coating 5 preset by the spray gun 2 , Spraying parameters: the selected powder material is the same as that of the workpiece 4 to be welded, the powder diameter is 5 μm to 120 μm, the spraying gas is air, nitrogen or helium, the gas temperature is 150°C to 350°C, the spraying width is 10mm to 30mm, and the thickness is 0.3mm ~2mm;

[0070] Step 3, friction stir welding, the amount...

Embodiment 2

[0075] Embodiment 1 is the thickening of pre-spraying, friction stir welding and surface protection spraying of a single pass. Repeat the pass, and finally carry out steps 4 and 5.

[0076] When multiple passes of cold spraying and friction stir welding are combined, this embodiment can also realize local additive manufacturing to further strengthen the structure.

Embodiment 3

[0078] According to the process requirements and the performance characteristics of the workpiece material, in this embodiment, the online local thickening cold spray gun 2 does not work or is only used for cooling spraying, and the weld seam is locally cooled. Other steps are the same as in Embodiment 1 and / or Embodiment 2. same.

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Abstract

The invention discloses an online cold spraying protecting and improving technology of a weld joint in friction stir welding. The technology is characterized in that a method of combining cold spraying and stir friction welding online is performed to achieve the purposes of effectively avoiding thinning of welding and reducing weak combination and brittleness of an existing cold spraying layer; the technical effects of synchronously improving the weld joint surface protecting and mechanical properties and synchronously realizing high performance and lightweight structure can be achieved; the method is applicable to corrosion prevention and mechanical property improvement of the weld joint in the friction stir welding.

Description

technical field [0001] This application relates to the field of aerospace technology, in particular, to an online cold spray protection and reinforcement technology for friction stir welding seams. Background technique [0002] As a solid phase welding technology, friction stir welding has been widely used in aerospace, aviation, rail transit and other fields. With the broadening of the scope of application, the application of this technology is constantly facing new challenges. Since the stirring head must have a corresponding press-in amount, it will directly cause the material in the weld zone to be thinned and reduce the overall structural strength of the joint. In addition, the stirring effect of the stirring head also led to the complete destruction of the original aluminum-clad layer on the surface of the material, making the weld area of ​​the joint extremely prone to corrosion, which seriously threatened the service safety of the structure. Therefore, effective co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08B23K20/12
CPCC23C24/082B23K20/122
Inventor 王非凡常志龙鄢东洋刘德博胡正根杨瑞生刘力源王晓博王爱民吴会强
Owner BEIJING INST OF ASTRONAUTICAL SYST ENG