In welding, the heating temperature is higher than the melting temperature of the solder and lower than the melting temperature of the base metal, that is, the solder melts but the base metal does not melt. In the process, the melted solder infiltrates and fills between the two base metals under the capillary attraction, and dissolves, diffuses, cools and solidifies with the base metal, and then the two base metals are welded together. In this material, all nodes between aluminum honeycomb core and aluminum honeycomb core, and between aluminum honeycomb core and aluminum panel are metal welded connections, and no non-metallic materials such as adhesive are added in the middle. This change has greatly changed the performance of aluminum honeycomb panel, forming an independent new metal structural material, rather than the traditional aluminum honeycomb composite material.
Because of the characteristics of honeycomb sandwich panel, it was first used in aerospace vehicles. It can greatly reduce the weight of aerospace vehicles while ensuring the function. It can travel farther with the same fuel. With the continuous progress of manufacturing technology and the development of materials, honeycomb sandwich panels are widely used in more and more other industries, such as national defense industry, aerospace, rail transit, ships, new energy vehicles, machinery, building decoration and other industries. With the implementation of national environmental protection and energy conservation policy, adhesive aluminum honeycomb will gradually be replaced by welded aluminum honeycomb, and the market prospect of welded aluminum honeycomb is very optimistic.
Adhesive honeycomb panel
Brazed honeycomb panel
Peel strength Nmm/mm
Compressive strength MPa
Flexural strength MPa
Apply 300000 n force per square meter, shake 3 million times, no macroscopic damage
High temperature resistance
Can not weld
The joint strength is high, the peeling strength of the roller is generally greater than 200n.mm/mm, and it is in the state of honeycomb core tearing.
The side length is 4mm, the wall thickness is 0.1mm, and the strength can reach above 6-20mpa.
The thickness of the aluminum foil of the honeycomb core welded with the compressive strength can be 0.10-0.35, the side length can be 04-10 mm, and the compressive strength is 4-10 MPa.
Good weather resistance
According to ISO 9227 standard, there is no obvious corrosion after 168 hours neutral salt spray test.
High fatigue life
Apply f = 1.8 ± 0.5kn at the center, with the frequency of 10Hz. After 3 million cycle tests, the product has no crack or deformation.
At present,in rail transit,welded honeycomb board can be applied to the following products: the floor of passenger compartment, the top plate of passenger compartment, the wall between vehicles, the screen door of vehicles and the bottom plate of equipment compartment.
The welded aluminum honeycomb board is used in the vehicle floor of Urumqi Metro Line 1 (27 trains). The material has the advantages of high peel strength, good tensile and compression resistance, high and low temperature resistance, non combustion, corrosion resistance and other irreplaceable advantages, and better solves the requirements of vehicle fire resistance and aging performance.
Shenzhen line 9, Shenzhen line 6 and Shenzhen line 10, the welding aluminum honeycomb board ceramic spraying structure is used on the roof of the vehicle interior. This technology is used in batches for the first time on the subway train, which solves the fire protection requirements of the vehicle and the scratch resistance of the paint.