duraluminium alloys cannot be effectively fusion-welded and such alloys,
which are mainly used for aircraft structures, are normally joined by riveting.
40
35
r>30
25
20
Distance
Weld pool
Figure 17.5 Hardness of
weld
zone in a non-heat-treatable aluminium alloy
Figure 17.5 shows the results of
a
hardness traverse of
a
weld between two
plates of
a
non-heat-treatable aluminium alloy. Within the heat-affected zone
the alloy is fully or partially annealed by the temperatures produced during the
welding. The result is that the work-hardened material is much softer in the
weld region than in the unaffected material. Since th ...
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