Abstract: A method for treating a single side surface of a metallic strip, such as a steel strip, by soldering a pair of metallic strips back-to-back along their corresponding edges, preferably inserting a metallic edge insert strips between the two metallic strips at their joined edges. After appropriate treatment of the exposed surfaces of the sandwiched strips, such as dipping in a molten metallic bath, the metallic strips are separated by heating above the melting point of the solder, and peeling the metallic strips away from each other.

Abstract: A method for treating a single side surface of a metallic strip by applying two strips back to back with an insert disposed between the strips in engagement with the back surfaces of the strips for preventing introduction of the treatment solution between the strips. The insert may be a magnetic pliable band in arrangements where the metallic strips are magnetizable, or it may be non-magnetic and provided with adhesive on its surfaces in engagement with the strip backs, or it may be held between the strips under pressure being applied to the strips forcing them toward each other.