Method for removing oxidation film and brazing foamed aluminum through self-friction of foam walls

A technology of aluminum foam and oxide film, which is applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of difficult removal of oxide film, non-wetting of solder, and decrease in joint strength, so as to achieve easy automation and short welding cycle , reduce the effect of stress concentration

Inactive Publication Date: 2012-07-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the brazing material is not wetted and the oxide film is difficult to remove during the aluminum foam brazing process, resulting in a decrease in the strength of the joint, and to provide a method for brazing aluminum foam by using the self-friction of the bubble wall to remove the oxide film

Method used

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  • Method for removing oxidation film and brazing foamed aluminum through self-friction of foam walls
  • Method for removing oxidation film and brazing foamed aluminum through self-friction of foam walls
  • Method for removing oxidation film and brazing foamed aluminum through self-friction of foam walls

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specific Embodiment approach 1

[0012] Specific implementation mode one: combine Figure 1 to Figure 5 Describe this implementation mode, this implementation mode is realized through the following steps:

[0013] Step 1. Fix the two aluminum foam plates on the welding fixture respectively, heat the two aluminum foam plates as a whole to above the melting point of the solder, that is, between 350°C and 460°C, and use rod-shaped Zn-Al-Cu solder respectively Slide back and forth on the surfaces to be welded of two foam aluminum plates, see figure 1 , so that the molten solder is evenly coated on the surface to be welded, see figure 2 ; Natural cooling to room temperature (20 ° C ~ 25 ° C);

[0014] Step 2. Fix one piece of aluminum foam weldment coated with solder on the fixed fixture, and clamp the other aluminum foam weldment coated with solder on the slidable fixture, and place the two The end faces of the foamed aluminum coated brazing material are connected, and the brazing material on the contact surf...

specific Embodiment approach 2

[0017] Embodiment 2: In step 1 of this embodiment, the method of heating the two aluminum foam boards as a whole adopts propane flame, oxyacetylene flame or furnace temperature, and the heating temperature is between 400°C and 430°C. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0018] Embodiment 3: In step 2 of this embodiment, the aluminum foam is heated by means of propane flame, oxyacetylene flame or furnace temperature. Other steps are the same as in the first embodiment.

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Abstract

The invention discloses a method for removing an oxidation film and brazing foamed aluminum through self-friction of foam walls, which relates to a welding method in the brazing field and solves the problem that the joint strength is reduced as brazing filler metal is non-wetting and the oxidation film is removed difficultly in the brazing process of the foamed aluminum. The method for removing the oxidation film and brazing the foamed aluminum comprises the following steps that: 1. two foamed aluminum plates are heated, and the rodlike brazing filler metal can slide on to-be-welded surfaces of the two foamed aluminum plates in a reciprocating way respectively, so that the brazing filler metal can be coated on the to-be-welded surfaces; 2. the end surfaces of the two foamed aluminum plates, which are coated with the brazing filler metal, are butted, and the brazing filler metal on the contact surfaces of the two foamed aluminum plates can be in a molten state after heating; 3. the foamed aluminum plates clamped by slidable fixtures can slide at the to-be-welded interfaces in a reciprocating way, and the pressure is exerted in the direction vertical to the welding surfaces at the same time; and 4. the sliding of the foamed aluminum plates can be stopped, the to-be-welded surfaces of the two foamed aluminum plates are aligned with each other and are pressurized again, heat preservation is carried out on the to-be-welded surfaces of the two foamed aluminum plates for 1-3 minutes, and then the to-be-welded surfaces of the two foamed aluminum plates can be cooled naturally to the room temperature, so as to realize a metallurgical-bonding brazing interface between the two foamed aluminum plates. The method for removing the oxidation film and brazing the foamed aluminum can be used for welding the foamed aluminum.

Description

technical field [0001] The invention relates to a welding method in the field of brazing, in particular to a welding method for foam aluminum butt joint and lap joint. Background technique [0002] Aluminum foam is a foam-like ultra-light metal material, and its unique pore structure makes it multifunctional and composite. Usually the porosity of aluminum foam is very high (>80%). Aluminum foam with a porosity of 90% has a density of only 0.27g / cm 3 , about 1 / 4 of the density of water. At the same time, foamed aluminum also has outstanding mechanical properties. When porous metal is subjected to compressive stress, the stress in the plastic deformation stage on its stress-strain curve is almost constant. When they deform, a large amount of energy is converted into plastic properties. Dissipates as heat and is an excellent material for impact protection. In addition, porous metal is also a typical ductile material, which can prevent instant catastrophic failure when th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K1/19
Inventor 黄永宪吕世雄龚靖刘华杰
Owner HARBIN INST OF TECH
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