Extrusion of Bimetallic Strip from Separate Containers

Abstract

Research has been continued into the production of bi-metallic strips by extruding two dissimilar metals from separate containers through a single die. Tin was extruded with lead at room temperature and copper with silver at approximately 750°C. Satisfactory pressure welding was achieved with bond strengths at least equal to the strength of the weaker metal. Within limits, adjusting the speeds of the extrusion rams produced corresponding changes in the relative proportions of the component metals in the extruded strip without impairing the bond strength. Limit analysis techniques and slip-line field solutions were used to estimate extrusion pressures and interfacial stresses.