Authors: Baba, Osamu; Okumoto, Yasuhisa; Abe, Akinori

Source: Journal of Ship Production, Volume 23, Number 1, February 2007 , pp. 46-52(7)

Publisher: Society of Naval Architects and Marine Engineers (SNAME)

Abstract:

Recently, many container ships have been built worldwide, and the size of them is skyrocketing to 10,000 TEU (Twenty Equivalent Unit) capacity. As a result, the plate thickness in the area of upper deck torsion box becomes thicker and thicker with higher-strength steel, up to 60 mm, to keep longitudinal strength, and then the welding work becomes more difficult and severe. For such joints of superthick plates IHI Marine United Inc. Kure shipyard has established high-quality and high-efficient welding methods:

• Development of new steel plates. In order to weld the thicker plates by high heat input such as 450 KJ/cm, new steel plates were applied in cooperation with a steel maker in Japan.

• Automation of butt welding. Electro-gas arc welding was applied for skin plates, and CO2 welding robot system was also introduced for longitudinals around the torsion box.

• Establishment of high quality welding practice. Welding without defects became possible by establishing adequate groove shape and welding procedure, as a result of many welding tests and inspections.

This paper describes the improved methods and the test results in detail.

Document Type: Research article

Publication date: 2007-02-01

More about this publication?

• The Journal of Ship Production publishes original and timely technical papers addressing problems of shipyard techniques and production of merchant and naval ships appear in this quarterly publication. Since its inception, the Journal has been a forum for peer-reviewed, professionally edited papers from academic and industry sources. As such, it has influenced the worldwide development of ship production engineering as a fully qualified professional discipline. Each issue contains a well-rounded selection of technical papers relevant to ship professionals, including written discussions and author's closures.
  
  From Volume 26 onwards this journal is published as Journal of Ship Production and Design
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