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Preparation method of foamed aluminum sandwich panel based on friction stir welding connection

A technology of friction stir welding and friction stir, applied in welding equipment, non-electric welding equipment, manufacturing tools, etc., can solve the problems of poor flatness of component panels, increased welding difficulty, complicated production process, etc., to achieve good foaming ability, The effect of increased density and high overall expansion rate

Pending Publication Date: 2021-06-15
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can prepare foamed aluminum sandwich panel prefabricated body, the production process is complicated and not suitable for large-scale production; when using friction stir welding to weld foamed aluminum sandwich panel and alloy plate, special angles need to be met to ensure the expansion rate , the normal intersection angle of the two weldments is required to be less than 180°, which requires the weld to meet a specific shape to ensure the expansion rate of the foamed aluminum sandwich panel, which increases the difficulty of welding, and the produced foamed aluminum sandwich panel The cell structure of the core layer at the welding seam cannot be guaranteed for components with other alloys, and the expansion rate cannot be controlled, so the panel flatness of the produced aluminum foam sandwich panels and alloy panels is poor

Method used

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  • Preparation method of foamed aluminum sandwich panel based on friction stir welding connection
  • Preparation method of foamed aluminum sandwich panel based on friction stir welding connection
  • Preparation method of foamed aluminum sandwich panel based on friction stir welding connection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Process such as figure 1 shown;

[0046] Mix aluminum powder, silicon powder, copper powder, magnesium powder and foaming agent titanium hydride powder, and mix evenly to obtain a core layer mixed powder; the core layer mixed powder is Si 6% by mass percentage; Mg 4%, Cu 4%, hair The foaming agent is 1%, and the rest is Al; the particle size of aluminum powder, silicon powder and magnesium powder is 100~400 mesh; the particle size of copper powder and titanium hydride powder is 400~1000 mesh; the tubular cavity is made of 6061 aluminum alloy and cold rolled , Combining sintering and hot rolling, the core layer powder is packed in a sealed tubular cavity, and finally the edge is trimmed to form at least one end face perpendicular to the horizontal plane to make a foamed aluminum sandwich panel prefabricated body;

[0047] Prepare two prefabricated aluminum foam sandwich panels of the same size, the thickness of the upper surface panel and the lower surface panel are bot...

Embodiment 2

[0059] Method is with embodiment 1, and difference is:

[0060] (1) The tubular cavity is made of 3003 aluminum alloy;

[0061] (2) The thickness of the surface panel of the prefabricated aluminum foam sandwich panel is 1.5mm, and the thickness of the core layer is 3.55mm;

[0062] (3) The shoulder reduction is 0.15mm; the rotating speed of the stirring needle is 800rpm, the welding speed is 110mm / min, the shoulder diameter of the stirring needle is 14mm, and the length of the stirring needle is 1.5mm; the stirring needle of the friction stir welding machine The pressure holding time for pressing is 4s, and the holding time for lifting is 2s; the inclination angle of the stirring needle of the friction stir welding machine is 1°;

[0063] (4) Foaming is carried out at 615°C, and the foaming time is 18 minutes; the expansion rate of the foamed aluminum sandwich panel is 445%;

[0064] Appearance photo of foam aluminum sandwich panel section as Figure 7 shown.

Embodiment 3

[0066] Method is with embodiment 1, and difference is:

[0067] (1) The tubular cavity is made of 3003 aluminum alloy;

[0068] (2) The thickness of the surface panel of the prefabricated aluminum foam sandwich panel is 2.11mm, and the thickness of the core layer is 3.49mm;

[0069] (3) The shoulder reduction is 0.2mm; the rotating speed of the stirring needle is 1200rpm, the welding speed is 100mm / min, the shoulder diameter of the stirring needle is 16mm, and the length of the stirring needle is 2.1mm; the stirring needle of the friction stir welding machine The pressure holding time for pressing is 5s, and the holding time for lifting is 2s; the inclination angle of the stirring needle of the friction stir welding machine is 3°;

[0070] (4) Foaming is carried out at 620°C for 20 minutes; the expansion rate of the foamed aluminum sandwich panel is 602%;

[0071] Appearance photo of foam aluminum sandwich panel section as Figure 8 shown.

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Abstract

The invention discloses a preparation method of a foamed aluminum sandwich panel based on friction stir welding connection. The preparation method comprises the following steps that (1) two foamed aluminum sandwich panel preforms are prepared; (2) surface treatment is carried out; (3) the end faces, perpendicular to the horizontal plane, of the two surface-treated preforms are in butt joint; (4) friction stir welding is carried out, the rotating speed of a stirring needle is 400-1200 rpm, and the welding speed is 100-200 mm / min; and (5) the welded preforms are put in a heating furnace to be foamed. The method can be used for preparing the foamed aluminum sandwich panel welding preforms with high panel bonding strength and can be used for preparing the foamed aluminum sandwich panel large in size, high in overall expansion rate, good in panel flatness and good in sandwich foam hole continuity; and the method is simple in process route and can be used for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of preparation of foamed aluminum sandwich panels, and in particular relates to a preparation method of foamed aluminum sandwich panels based on friction stir welding connection. Background technique [0002] As an emerging porous composite material, aluminum foam sandwich panel has many unique physical and chemical properties compared with traditional metal materials, such as light weight, high specific stiffness and specific strength, better energy absorption, sound absorption and sound insulation and Electromagnetic shielding performance, etc.; after special design and assembly, the material can be used as a material integrating structure and functionality; the lightweight design of this type of material in the fields of aerospace and transportation is used in urban construction and engines The sound-absorbing structure of the partition, and the use of its energy-absorbing characteristics to manufacture v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K20/12B22F3/11B22F7/08
CPCB23P15/00B23K20/122B22F7/006B22F3/1125
Inventor 祖国胤穆永亮苏喜喜孙溪黄鹏冯展豪高强
Owner NORTHEASTERN UNIV
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