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Cladding (metalworking)
Cladding is the bonding together of dissimilar metals. It is different from fusion welding or gluing as a method to fasten the metals together. Cladding is often achieved by extruding two metals through a die as well as pressing or rolling sheets together under high pressure.
The United States Mint uses cladding to manufacture coins from different metals. This allows a cheaper metal to be used as a filler.
==Roll bonding ==
In roll bonding, two or more layers of different metals are thoroughly cleaned and passed through a pair of rollers under sufficient pressure to bond the layers. The pressure is high enough to deform the metals and reduce the combined thickness of the clad material. Heat may be applied, especially when metal are not ductile enough. As an example of application, bonding of the sheets can be controlled by painting a pattern on one sheet; only the bare metal surfaces bond, and the un-bonded portion can be inflated if the sheet is heated and the coating vaporizes. This is used to make heat exchangers for refrigeration equipment. 〔Bralla, James G. ''Handbook of Manufacturing Processes'' Industrial Press 2007 ISBN 978-0-8311-3179-1 pages 310-312 〕
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