Paper Title:
Back Bead Characteristics during Butt Welding of a Thick Plate for Various Backing Conditions
  Abstract

In a welded structure, thick plates are joined by multi-pass welding in the butt joint. During the first pass of multi-pass welding, burn-through, lack of fusion, and incomplete penetration were readily found as weld defects. Accordingly, the backing condition should be carefully selected in welding of a thick plate, because improper backing conditions lead to weld defects. In the job site, a steel backing strip is usually adopted, although it reduces the fatigue strength. No backing conditions or removable backing is recommended to increase the fatigue strength, but selection of the proper backing and welding conditions is complicated. In this study, several backing methods, such as ceramic backing, water-cooled copper backing, and even the use of no backing, were investigated during GMA (Gas Metal Arc) welding of a thick steel plate. The gas metal arc welding conditions were established for each backing method, and the bead shape and mechanical properties were examined after welding.

  Info
Periodical
Materials Science Forum (Volumes 654-656)
Main Theme
Edited by
Jian-Feng Nie and Allan Morton
Pages
350-353
DOI
10.4028/www.scientific.net/MSF.654-656.350
Citation
C. H. Kim, "Back Bead Characteristics during Butt Welding of a Thick Plate for Various Backing Conditions", Materials Science Forum, Vols. 654-656, pp. 350-353, 2010
Online since
June 2010
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Price
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