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Wet Welding Field Trials in Shallow Waters for Structural Repairs in Floating Oil Production Units

[+] Author Affiliations
Ezequiel C. P. Pessoa

IFMG, Betim, MG, Brazil

Alexandre Q. Bracarense

UFMG, Belo Horizonte, MG, Brazil

Valter R. Santos, Fernando C. R. Assunção, Maurício J. Monteiro

PUC-Rio, Rio de Janeiro, RJ, Brazil

Ricardo R. Marinho

Petrobras, Rio de Janeiro, RJ, Brazil

Leonardo A. Vieira

ESAB Soldagem e Corte, Contagem, MG, Brazil

Dario Barbalho Siva

Continental Serviços Marítimos, Macaé, RJ, Brazil

Paper No. OMAE2013-10097, pp. V003T03A004; 8 pages
  • ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3: Materials Technology; Ocean Space Utilization
  • Nantes, France, June 9–14, 2013
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5535-5
  • Copyright © 2013 by ASME


Saving costs is a major attraction of wet welding application in structural repairs of offshore installations. Nevertheless, improve the quality of wet welding to get it as close as possible to plain structural steel quality and also qualify welding procedures in AWS D3.6 class ‘A’ have been challenges not consistently overcome. This paper describes wet welding trials in shallow waters (5m and 10m) with a rutile and an oxy-rutile type, both commercial electrodes. Two different base metal compositions were employed in the preparation of butt and fillet joints. The main objective is to amend new results of wet weds properties to those already published aiming the application of this welding technique under more reliable conditions and the qualification of welding procedures. The weldments were tested by Vickers hardness, Charpy V notch, tensile, shear strength, bending and fillet weld break tests, chemical and macrographic analysis. Some of these properties and diffusible hydrogen, obtained in laboratory with a mechanized gravity system, will also be presented in order to complement or explain the field testes results obtained. Both electrodes produced class AWS E 70XX weld metals and overall results according class “B” requirements of the AWS D3.6M:2010 code. Some good elongation results obtained encourage future trials to achieve class “A”. Barriers to the class “A” qualification of welding procedures in shallow waters are also discussed.

Copyright © 2013 by ASME
Topics: Maintenance , Welding , Water



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