PRESSURE WELDING METHOD OF COMPOSITE MATERIAL

摘要

PURPOSE:To make the reduction of area of respective strips different and to provide a difference in the degree of work hardening in roll pressure welding of a composite material by winding the 1st strip on a roll, rolling the same together with the 2nd strip and rotating the pressure-welding rolls at different circumferential speeds. CONSTITUTION:The 1st strip 1 is wound on a small-diameter upper roll 5 and is pressure-welded and rolled together with the 2nd strip 2 between said roll and a large-diameter lower roll 6. The number of revolutions of the rolls in this case is the same, but the reduction of area of the strip 1 on the roll 5 is increased and the strips are satisfactorily pressure-welded without slipping at winding. Such change in the circumferential speed occuring in a difference in the roll diameters is also applicable to the conventional rolling mill by changing the number of revolutions of the upper and lower rolls. The method is applicable to production of a composite material for a backing metal having low hardness or a composite material for a thick backing metal.