AD VER TORIAL
ADVANCED TECHNOLOGIES IN RUSSIAN SHIPBUILDING
Aleksander N. Aleshkin, Valerii M. Levshakov, Natalia A. Steshenkova. Shipbuilding and Shiprepair Tech-
nology Center (SSTC), a leading design and technology ship-building center in Russia, since its foundation in 1939 has been developing and implement in Russia shipbuilding sector highly ef- fective technologies for construction, operation and repair of marine equip- ment. One of the methods for improv- ing quality of shipbuilding products is application of tech-nologies for processing of hull structures and ma- rine engineering articles, based on use of high-concentrated energy sources, such as laser and plasma technolo- gies. Main advantages of laser welding, comparing to conventional arc tech- niques, are higher processing speed, good quality of welds, minimal zone of thermal effect, minimum consump- tion of adding materials and practical absence of welding deformations. For manufacturing of flat panels,
one of main structural component of a ship’s hull, there is an industrial technology, based on laser cutting and hybrid laser-arc welding. The technol- ogy is imple-mented at a pilot line for assembly and welding of flat panels up to 12 x 12 m from plates 4 to 20 mm thick, developed and manufactured in cooperation with IMG, Germany (see Fig. 1), The innovative solution, ap- plied in the line for the first time in the world practice, is combination of grooving by laser cutting and joining of plates with laser-arc welding in one operational position.
Fig. 1 – Flat panels line Plates welding position is equipped
with a pressing portal for securing plates, and portal for la-ser cutting and hybrid laser-arc welding of their butt edges, with two carriages with optical heads for cutting and weld- ing. Laser cutting carriage is equipped with optical head for cutting and module for inclining this head by 0 to 10 degrees, for grooving purpose. The welding carriage combines hybrid laser-arc and tandem welding head, allowing to perform single-run weld of materials up to 20 mm thick. The plates, after feeding and alignment, are fixed with hydraulic cylinders on pressing portal. Sequential grooving is made by laser cutting. From plates over 14 mm thick, grooving is made with nosing. After grooving the plates are joined without gaps and then hy- brid-laser-arc welding is per-formed at a speed of 1.0-2.5 m/min. The weld-
ing carriage is equipped with guiding and weld tracking system. For thicker plates groove is filled with tandem welding head. This, plates up to 20 mm thick can be welded in a single run. After joining plates, framing is fixed on them with hydraulic clamps, installed on framing securing and welding portal, Special back bend- ing device is used for compensat-ing possible welding deformations. Then framing is welded to the plate with hybrid laser-arc welding in a single run. Equipment is fully automates and operation is controlled by pro- grams, started from op-erator’s panels. Standard procedure of hybrid laser-
arc welding of plates up to 20 mm thick and framing with integrated grooving by laser cutting is approved by Russian Maritime Register of Shipping (Ap- proval Certificate No. 12.02754.314 от 06.08.2013)
Fig. 2 – Robotized complex for welding and cutting in various positions: (a) overall view, (b) process of hybrid laser-arc welding b
a
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