Vibration welding method for foamed aluminium scraper

Abstract

The invention aims to provide a scraping and vibrating welding method for foamed aluminum, which comprises: the foamed aluminum is heated until the temperature is higher than the melting point temperature of a soldering wire or brazing alloy; the soldering wire is respectively stroke on one surface of a foamed aluminum plate A and one surface of a foamed aluminum plate B, so that molten metals are uniformly laid on the surfaces of the foamed aluminum plates; one surface of foamed aluminum plate A and one surface of the foamed aluminum plate B which are provided with the brazing alloy are opposite to each other and clamped on a clamper, and pressure which is perpendicular to the welding surfaces is exerted; and the foamed aluminum plate A and the foamed aluminum plate B are vibrated by means of ultrasonic vibration and simultaneously heated by flame, so that the two foamed aluminum plates are welded together. The scraping and vibrating welding method for the foamed aluminum adopts wire brushes or steel wires for scraping, makes the brazing alloy capable of fully contacting aluminum parent metals and reacting with the aluminum parent metals, exerts ultrasonic vibration so as to be favorable to remove oxide films on the surfaces of the foamed aluminum in weld zones, cleans away superfluous brazing alloy, can reduce filled brazing alloy, makes the welded seams reach optimum clearance value, reduces the overall weight after welding, gives full play to light weight advantage of the foamed aluminum, and has special significance in the fields of aerospace and so on which are sensitive to weight.

Description

(1) Technical field [0001] The invention relates to welding technology, in particular to a foam aluminum scraping and vibration welding method. (2) Background technology [0002] Aluminum foam is a new type of porous material with numerous bubbles distributed in the metal aluminum matrix. It has the characteristics of a continuous metal phase and a dispersed air phase, and is a new type of material with a variety of excellent properties. [0003] The pore size of the bubbles in foamed aluminum is relatively large, and it has a high porosity (40% to 90%), so that its density is only 0.1 to 0.4 times that of metal aluminum. The bending ratio stiffness of aluminum foam can reach 1.5 times that of steel, the damping performance can reach 5-10 times that of metal aluminum, and it has a high energy absorption rate, making its shock absorption performance very outstanding. In addition, aluminum foam also has good acoustic performance, excellent electromagnetic shielding performan...

AI Technical Summary

Problems solved by technology

However, the oxide film on the surface of the aluminum material is dense and has a high melting point, which is difficult to remove, which seriously hinders the spreading and wetting of the solder on the base metal, and the special porous structure on the surface of the foamed aluminum makes the removal of the oxide film more difficult, so The brazing material cannot be spread as smoothly as on the aluminum plate, which is also a big problem in the brazing process of foamed aluminum

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