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Unformatted text preview: n Stir Welding: As pointed out in the “Aluminum
Industry Technology Roadmap,”17 the technology
of aluminum joining has advanced rapidly in recent
years. Developments in FSW especially have been most
signiﬁcant and have provided aluminum with a signiﬁcant
competitive advantage in some markets (Figure 7). Since
its inception in the early 1990s, FSW has advanced most
rapidly with aluminum due to its combination of low
melting point, high thermal conductivity, and ductility
and is now being used on the external tank of the Space
Shuttle and the Eclipse business jet. FSW has enabled
the joining of previously difﬁcult to weld alloys, often
with improved mechanical properties and corrosion
resistance. Experience with FSW in the fabrication of fast
ferries and bridge decks indicates that the process has
increased automation, improved dimensional tolerances,
reduced residual stresses, and lowered manpower needs.
The process is especially advantageous in the fabrication
of long butt welds, but welding along curves and around
cylinders is now also...
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- Spring '10