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Title: Excellent for beginner but error in describing Alclad.
Review: p.47, top left picture and section 'Aluminum Oxide'. All aluminum surfaces will oxidize unless protected by a film or chemical treatment. Alclad material has had a layer of some other alloy mechanically bonded to the surface of the core alloy. The layer varies from 1.5% to 15% of total thickness depending on the particular core alloy and product. The clad layer should not be removed as weldability of the product depends on the core alloy.
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