The invention discloses a method for preparing a
structural material of floors and coaches of high-speed trains. In the method, super light foamed
aluminium or foamed aluminum
alloy is used as a core layer and aluminum plates with different thicknesses, wherein the aluminum plates are used as upper and lower faceplates to be compounded with the core layer to form the sandwich panels. The method is characterized in that, through mechanically and forcedly paving and spreading the foamed
aluminium core layer and the faceplates in a
brazing filler metal melt and then carrying out fusion and vibration-assisted coagulation, attached
surface oxidation films are removed, and the foamed
aluminium core layer and the faceplates are prevented from being oxidized again during
welding, and finally, a
structural material for floors and coaches of high-speed trains which is compounded by carrying out large-area
welding on the foamed aluminium core layer and the upper and lower faceplates. Compared with the material prepared by a traditional cementing method, the material prepared by the method disclosed by the invention has the advantages of high rigidity, long service life,
noise isolation,
energy absorption, vibration damping, inflaming retarding,
corrosion resistance and
electromagnetic shielding; meanwhile, the cold and
heat processing such as re-
welding,
surface coating, scraping and thelike and the complete recycling of the material can be realized, and the prepared
structural material can replace the structural material for floors and coaches of high-speed trains prepared from
honeycomb aluminium sandwich structural slabs,
honeycomb paper sandwich structural slabs, organic foamed plastic sandwich panels such as polyurenthane panels and the like,
metal-coated wood boards, and other various composite materials.