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This series of standards applies to welding of metallic materials in the manufacture and maintenance of railway vehicles and their parts. This part of the series defines the classification levels as well as the requirements for manufacturers of welded railway vehicles and components. This part of the series specifies: - inspections and testing to be executed on the welds; - destructive as well as non-destructive tests to be performed; - necessary documentation to issue to declare the conformity of the products.