aluminum clad fin

Technical indicators of aluminum clad fin:
Alloy composition: 3003, 3N03, 4343, 4045, 4004, 4N43, 4N45, 4N04 and other brands;
Product thickness: (0.04~3) ±(0.01~0.03) mm;
Product width: (10~150) ± (0.20~0.30) mm;
Mechanical properties: tensile strength σb: 135~195N/mm2, elongation δ≥1%.
 
The technical characteristics of the aluminum clad fin for automobile heat exchangers is the use of rolling composite technology, covering one or both sides of 3xxx series or 6xxx series aluminum matrix (core layer) with 4xxx series or 7xxx series aluminum alloy brazing material ( Skin layer), welded and rolled together at high temperature and high pressure on a hot rolling mill, and then cold rolled to the finished product.
 
aluminum clad fin is developed with the advancement of vacuum brazing technology. Its process feature is to require a layer of brazing alloy on the surface of the heat dissipation fin, and the thickness of the cladding layer is usually about 10% of the total thickness of the composite material. Its melting point should be about 50℃ lower than that of the base aluminum alloy, the melting point of the base alloy is 630℃～660℃, and the melting point of the coating layer is 580℃～610℃. Therefore, after the assembled heat exchanger is kept in a furnace at about 600°C for a certain period of time, the fin base alloy will not melt, but the Al-Si alloy coating layer as the brazing material will melt, and it will be firm after cooling. The ground is brazed into a whole.