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Covered Electrodes Temperature Variation During Wet Welding and Its Influence on Weld Metal Porosity

[+] Author Affiliations
Ezequiel C. P. Pessoa, Alexandre Q. Bracarense, Eduardo M. Zica

Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil

Stephen Liu, Faustino Peres Guerrero

Colorado School of Mines, Golden, CO

Paper No. OMAE2005-67411, pp. 191-197; 7 pages
doi:10.1115/OMAE2005-67411
From:
  • ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
  • 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 3
  • Halkidiki, Greece, June 12–17, 2005
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4197-9 | eISBN: 0-7918-3759-9
  • Copyright © 2005 by ASME

abstract

The objective of this work was to evaluate the porosity variation along weld bead and its relation with weld metal mechanical properties and electrode heating during underwater wet welding. Three commercial covered electrodes were used to make bead-on-plate welds. V-groove welds were also made using two electrodes at 50 and 100 meters depth in three different steels. Electrode temperature and weld metal porosity measurements and mechanical tests were performed. The results of temperature measurements indicated that electrode temperature increases during underwater wet welding. Simultaneously, porosity reduces along the BOP and V-groove weld beads. Mechanical tests showed that the mechanical properties are better at the end of welds. Additionally, the load supported by side bend tests samples extracted from 50 meter welds were higher than that measured for the 100 meter welds. Tensile test results also showed similar trend. Charpy test did not reveal any relation between the absorbed energy and porosity reduction along weld bead. However presented the same trend of bend and tensile tests at 50 and 100 m depth.

Copyright © 2005 by ASME

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