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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