Shipbuilding Technology and Education

Shipbuilding Technology and Education PDF

Author: Division on Engineering and Physical Sciences

Publisher: National Academies Press

Published: 1996-05-22

Total Pages: 161

ISBN-13: 030905382X

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The U.S. shipbuilding industry now confronts grave challenges in providing essential support of national objectives. With recent emphasis on renewal of the U.S. naval fleet, followed by the defense builddown, U.S. shipbuilders have fallen far behind in commercial ship construction, and face powerful new competition from abroad. This book examines ways to reestablish the U.S. industry, to provide a technology base and R&D infrastructure sustaining both commercial and military goals. Comparing U.S. and foreign shipbuilders in four technological areas, the authors find that U.S. builders lag most severely in business process technologies, and in technologies of new products and materials. New advances in system technologies, such as simulation, are also needed, as are continuing developments in shipyard production technologies. The report identifies roles that various government agencies, academia, and, especially, industry itself must play for the U.S. shipbuilding industry to attempt a turnaround.

The National Shipbuilding Research Program. Automated Process Application in Steel Fabrication and Subassembly Facilities; Phase II (Process Comparison).

The National Shipbuilding Research Program. Automated Process Application in Steel Fabrication and Subassembly Facilities; Phase II (Process Comparison). PDF

Author:

Publisher:

Published: 1999

Total Pages: 54

ISBN-13:

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In an effort to produce cost competitive ships in a time of reduced Defense spending and dominance of the world commercial market by foreign yards. the American shipbuilding industry is investigating methods that will streamline production and reduce fabrication and assembly times. One such methods is the introduction of automation into steel fabrication and subassembly processes. Many of the processes in these areas are both labor intensive and repetitive. characteristics that are ideally suited to be handled by automation. The drawback, however, is the capital cost associated with automation especially when it is not known whether the automation will produce a positive return on the investment dollar. Computer simulation is being used in other manufacturing industries worldwide to gain insight into how the introduction of new resources affects the company's current manufacturing capabilities and whether or not the new resources will produce a positive return on investment.

Ship Construction and Welding

Ship Construction and Welding PDF

Author: Nisith R. Mandal

Publisher: Springer

Published: 2016-11-09

Total Pages: 322

ISBN-13: 9811029555

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This book addresses various aspects of ship construction, from ship types and construction materials, to welding technologies and accuracy control. The contents of the book are logically organized and divided into twenty-one chapters. The book covers structural arrangement with longitudinal and transverse framing systems based on the service load, and explains basic structural elements like hatch side girders, hatch end beams, stringers, etc. along with structural subassemblies like floors, bulkheads, inner bottom, decks and shells. It presents in detail double bottom construction, wing tanks & duct keels, fore & aft end structures, etc., together with necessary illustrations. The midship sections of various ship types are introduced, together with structural continuity and alignment in ship structures. With regard to construction materials, the book discusses steel, aluminum alloys and fiber reinforced composites. Various methods of steel material preparation are discussed, and plate cutting and forming of plates and sections are explained. The concept of line heating for plate bending is introduced.Welding power source characteristics, metal transfer mechanisms, welding parameters and their effects on the fusion zone, weld deposit, and weld bead profile are discussed in detail. Various fusion welding methods, MMAW, GMAW, SAW, Electroslag welding and Electrogas welding and single side welding are explained in detail. Friction stir welding as one of the key methods of solid state welding as applied to aluminum alloys is also addressed. The mechanisms of residual stress formation and distortion are explained in connection with stiffened panel fabrication, with an emphasis on weld induced buckling of thin panels. Further, the basic principles of distortion prevention, in-process distortion control and mitigation techniques like heat sinking, thermo-mechanical tensioning etc. are dealt with in detail. In its final section, the book describes in detail various types of weld defects that are likely to occur, together with their causes and remedial measures. The nondestructive testing methods that are most relevant to ship construction are explained. Lastly, a chapter on accuracy control based on statistical principles is included, addressing the need for a suitable mechanism to gauge the ranges of variations so that one can quantitatively target the end product accuracy.

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