The technical characteristics of the composite aluminum material for automobile heat exchangers are that the rolling composite process is adopted, and one or both sides of the 3xxx series and 6xxx series aluminum matrix (core layer) are covered with 4xxx series or 7xxx series aluminum alloy brazing material (skin layer) , are rolled together by high temperature and high pressure welding on a hot rolling mill, and then cold rolled to the finished product....

Introduction of brazed clad aluminum sheet strip foil for automotive heat exchanger

The technical characteristics of the composite aluminum material for automobile heat exchangers are that the rolling composite process is adopted, and one or both sides of the 3xxx series and 6xxx series aluminum matrix (core layer) are covered with 4xxx series or 7xxx series aluminum alloy brazing material (skin layer) , are rolled together by high temperature and high pressure welding on a hot rolling mill, and then cold rolled to the finished product.

The composite aluminum plate, strip and foil uses vacuum brazing technology. The process characteristic is that a layer of brazing alloy alloy is required on the surface of the heat dissipation fin. The thickness of the coating layer is usually about 10% of the total thickness of the composite material, and its melting point should be higher than that of the base aluminum alloy. The melting point of the base alloy is about 50℃, 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 cladding layer used as brazing material will melt, and it will be firm after cooling. Brazed into one.

Features of brazed clad aluminum sheet strip foil for automotive heat exchanger

High strength and excellent welding performance.

It has good heat and high temperature resistance, and has certain corrosion resistance.

Excellent processing performance, small deformation, easy to form.

The product is beautiful, the welding has no pores, cracks, etc., the surface of the welded joint is bright, and the fillet is uniform.

Specification of brazed clad aluminum sheet strip foil for automotive heat exchanger

Alloy composition: 3003, 3N03, 4343, 4045, 4004, 4N43, 4N45, 4N04 and other alloys;

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%.