Effect Of Cold-Rolling Bonding Process On Microstructure And Properties Of The Sandwich Aluminum Foil For Automobile Heat Exchanger

The cold-rolling bonding process of sandwich aluminum foil for automobile heat exchanger was investigated, and the effect of deformation rate in the first pass, the clad thickness and the final annealing schedule on microstructure and properties of the sandwich foil was analyzed. The results showed that under deformation rate of 30%-50% in the first pass, the initial bonding can be gained between the clad A4045 and the core A3003, the upper clad thickness of the product was probably the same as the lower one. The final clad rate was influenced by deformation rate and initial thickness of the rolled piece; it increases with the increasing of deformation rate and initial thickness. The cladding foil had the best sagging resistance when the cold-rolling deformation rate was 25%-35%. The mechanical properties and the welding performance were related to the final heat treating regime, it can be found that the welding performance is better, when annealing at 360 degrees C for 80 minutes.