Abstract:The hot rolling bonding process of 3-layer bonding sheet of Al-Si/Al-Mn Al-alloy has been studied. In order to obtain the isostrength bonding, the hot rolling bonding technology (hot rolling temperature, hot rolling reduction, initial cladding rate) was optimized by using an orthogonal method and a variance analyzing method. The result shows that when the optimized hot rolling temperature is 490℃, the optimized hot rolling reduction is 90%, and the optimized initial cladding rate is 13%, the shear strength of bonding surface attains 99.51 MPa. The effect of bonding technological factor on bonding strength and the appearance of the over-burden face were analyzed and determined with the aid of metallographic microscope, scanning electron microscope and spectrometer. It was pointed out that the hot rolling bonding reduction is the main factor affecting bonding strength and the next one is hot rolling temperature, but the effect of initial cladding rate is very small. Besides, diffusion bonding mechanism was believed playing a main role in bonding mechanism.

Key words: aluminum alloy　bonding sheet　rolling bonding　bonding mechanism