Chapter 9 - Roll Bonding

Abstract

Understanding the mechanisms and details of roll bolding is of significant industrial importance because the components produced by cold pressure welding include automotive parts, bimetal products, and household items. The solid-state joining technique can be used on a large number of materials. The materials that cannot be welded by the traditional fusion process often respond well to cold welding. The cold-welding process causes bonding by adhesion, and this requires the surfaces to be clean and to be an interatomic distance apart. Cleanliness of a surface is difficult to achieve without controlled atmosphere and significant plastic deformation. The normal pressure needs to be sufficient enough to satisfy the second criterion of the adhesion hypothesis that the surfaces should be close to one another and at least some new metal surface are created. It is the shear strength of the bond that determines the usefulness of the two-layered component in the subsequent metal forming processes, in which bending in two directions takes place, such as in deep drawing, stretch forming, or a combination of the two.