Sub-Assemblies

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When plates and sections have been machined they are
ready for assembly into ship units. Within the fabrications shop there are
often arranged a number of bays for different assemblies, for example flat
plate panels, curved shell units, matrix or ‘egg box’ structures and some minor
sub-assemblies. All these may be termed sub-assemblies if they are subsequently
to be built into a large unit prior to erection. Panel assembly is usually
highly automated with prepared plates being placed and tack welded prior to
automatic welding of the butts, after which the plates are turned and back
welded unless a single sided weld process has been used. The panel is marked
and the stiffeners placed and welded automatically or with semi-automatic
process. Minor sub-assemblies such as deep frames consisting of web and welded
face flat may also be attached at this stage. Curved shell plates are placed on
jigs and welded and the various stiffening members can be aligned and welded in
a similar manner to those on a flat panel assembly. Assembly jigs may also be
used for matrix or ‘egg box’ assemblies, for example structures of solid and
bracket plate floors with longitudinal side girders which are to go into double
bottom units.

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