Improvements of Flux-Copper Backing Welding Quality

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Abstract:

Flux-copper backing process welding is a high-speed, one-sided automatic welding process that is a type of submerged arc welding. Although it has been widely applied for the joining of flat skin plates in shipbuilding, a couple of problems with this process still exist: longitudinal cracks occur in the vicinity of the end point, and transverse cracks occur on the back surface. The data in this study were collected in the production site of Ishikawajima-Harima Heavy Industries Company Ltd, Kure Shipyard. The causes of failures were examined, and countermeasures were studied. Concerning the longitudinal cracks, the behavior of plate deformation during welding was investigated, and the end tab plates and the tack welding method were improved in order to reduce the rapidly increased transverse distortion of the joining plates. Concerning the transverse cracks, the dispersal figure of the reverse flux to form the backing bead was observed, the relation between the flux spraying height and the welding quality was investigated, and the height was standardized. In addition, welding heat input was also examined and regulated to avoid the transverse cracks.

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Document Type: Research Article

Publication date: November 1, 2003

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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