When bimetallic (copper-steel) rod is rolled and subjected to stretching passes from an initial billet using the explosive method, the distribution of hardness in both components of its joint confirms that it is in a nonuniform stress-strain state. This is a result of the substantial differences in the yield stress of the bimetallic components as well as the nonuniform character and a degree of rod deformation along the width and length of the deformation zone.The additional tensile stresses that arise in the steel core are the reason for increased elongation during rolling. These stresses may also decrease the force necessary in subsequent drawing.The explosive technique of producing the initial bimetallic bar ensures a strong component joint, which does not separate during rolling.
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