The fact that the technology enables the joining of

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Unformatted text preview: ess for the butt welding of the lengthy longitudinal extruded sections that comprise the roof and floor sections of the cars. The fact that the technology enables the joining of some alloys that traditionally have been difficult to weld, e.g. most 2xxx and 7xxx LIGHT METAL AGE, OCTOBER 2007 11 Table I. Aluminum attributes in rail applications. and corrosion performance,14, 16 but the development of friction stir welding, which is discussed hereafter, may change that situation. It is interesting to note that the advanced trains are still using these similar materials. For example, the Japanese Shinkansen uses 5083 alloy, and also some 7075 material, which is more frequently used as an aerospace material, while the German Transrapid uses 5005 sheet for panels and 6061, 6063, and 6005 for extrusions. Recent Alloy Developments: Some recent research for improved rail materials has been evaluating newer aluminum alloys containing scandium additions.16 Scandium provides the highest amount of strengthening per atom percent of any alloying element when added to aluminum. Small additions (0.1-0.2 wt%) have been shown to improve mechanical proper...
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