fig1 illustrates the known technique for package rolling in which two compound plates are placed together to form a package ready for rolling the base plates designated 1 and the plating sheets designated 4 are of different materials which are often difficult or impossible to weld together as in the case of titanium and carbon steel for instance since a gas tight joint is required it is therefore easier and cheaper to weld only the base materials to each other the insert 8 which is usually of the same type of material as the base material i e generally carbon steel constitutes a protection for the plating material during welding and serves as a bridge in the case of thick plating sheets 10 30 mm each the gap may otherwise be too large to achieve a tight weld joint between the base materials the insert also has a favourable effect on the flow during rolling i e it reduces the tendency of varying thickness in the plating sheets at the edges of the rolled compound plate numeral 9 designates the weld joint around the edge of the package which has already been mentioned in fig2 the base material 1 rests on a surface 2 a bed of sand for instance thin strips of metal 3 have been applied by glueing for instance around the edges of the base material on its upper surface the plating material 4 is applied in known manner spaced from the base material 1 and its area is such that it fits inside the frame formed by the metal strips 3 or negligibly smaller than said frame the periphery of the plating material 4 is surrounded by expansion elements 5.