Process for producing multi-layer metallic material

Claim 1

A PROCESS FOR PRODUCING A MULTI-LAYER, FLAT METALLIC MATERIAL, SAID PROCESS COMPRISING: SANDWICHING A FIRST PAIR OF METALLIC SLABS OF A FIRST COMPOSITION BETWEEN A SECOND PAIR OF METALLIC SLABS OF A SECOND COMPOSITION WITH A WELD-PREVENTING COMPOUND SEPARATING SAID FIRST PAIR OF SLABS; SEALING SAID SANDWICH CONTINUOUSLY ALONG THE PERIPHERYL THEREOF TO PREVENT ENTRY OF FOREIGH MATEIRAL BETWEEN ANY OF THE SLABS UNTIL THE SEAL IS REMOVED; THEN WELDING EACH OF THE FIRST PAIR OF SLABS TO A RESPECTIVE ONE OF SAID SECOND PAIR OF SLABS BY HOT ROLLING; THEN COATING BOTH EXTERIOR FLAT SURFACES OF SAID SANDWICH WITH A MOLTEN METAL OF A THIRD COMPOSITION, BY DIPPING SAID SANDWICH IN SAID MOLTEN METAL; THEN REMOVING THE CONTINUOUSLY SEALED PERIPHERY OF SAID SANDWICH AFTER SAID COATING STEP TO ENABLE SEPARATION OF THE TWO SANDWICH HALVES; AND THEN SEPARATING SAID SANDWICH INTO TWO HALVES, EACH COMPRISING A CENTER LAYER OF SAID SECOND COMPOSITION AND INTEGRAL OPPOSITE EXTERIOR LAYERS OF SAID FIRST COMPOSITION AND SAID THIRD COMPOSITION RESPECTIVELY.