The bonding surface of both cladding metal and backing steel are ground and thoroughly cleaned. The bonding surface of the cladding metal is nickel-plated to ensure metallurgical bond. The reverse side of the cladding metal is coated with an infusible parting compound.
Two pairs of plates, each with the backing steel outside and cladding metal inside are matched together to form a composite assembly and then sealed along the edges by welding. The welding is performed to protect the corrosion resistant alloy from possible contamination by exposure to atmosphere during heating before rolling.
3.Rolling, Heat-Treating and Cutting
The composite assembly is heated to the proper temperature in a heating furnace and rolled to the given sizes in order to bond the cladding and backing materials metallurgically. After rolling, the assembly is heat-treated as required considering the mechanical properties of the backing steel and corrosion resistance of the cladding metal. The assembly is then separated into two clad plates to be cut into given dimensions.
4.Surface Finishing and Packaging
Both cladding and backing plates are surface-finished to eliminate injurious defects. In particular, the corrosion- resistant surface of the cladding metal is ground by abrasive belt and pickled. The finished clad plates are shipped with the surfaces properly protected against damage during transportation.
5.Testing and Inspections
In order to assure and guarantee the quality of the clad plates, ultrasonic examination and mechanical testing are conducted with aid of a computer system.