Investigation of the parameters of the cold roll bonding (CRB) process

In this study, commercial purity aluminum (AA1100) strips were cold roll bonded at ambient temperature. As the main factors, the effects of different amounts of reduction in thickness, initial thickness, rolling speed, and rolling direction on bond strength were evaluated by the peeling test. Also, the effects of pre- and post-rolling annealing treatments were investigated. It was found that higher reductions, lower initial thickness, and rolling speed were the important factors involved in improving bond strength. Also, annealing treatment before and/or after the CRB process increased bond strength, while the effect of pre-rolling annealing was more pronounced. Furthermore, bond strength decreased by increasing the angle of CRB process with respect to the rolling direction of as-received strips. Finally, optical and scanning electron microscopes were used to evaluate the surface conditions of the peeled surfaces.