The objective of this work was to determine for particular water depth, the optimum current ranges in terms of best porosity location. Pores located at the top part of each weld bead were generally eliminated through re-melting by the next weld bead. This finding was consistent in fresh water wet welds on ASTM A36 steel using three commercial electrodes: E6013, E7018 and E7024 grades. Two depth levels were studied, 50 and 100 meters. A gravity feed welding system was used in a hyperbaric chamber of 200 m pressure capability. Through visual analysis and with help of a computer software, the optimal weld parameters for each electrode and depth regarding pore location were determined. Additionally, it was observed that porosity increases with increasing current and depth. Similar to welding in seawater, it was also verified that the E6013 electrodes presented greater arc stability and produced the best beads, while the E7018 electrodes did not produce good results. The E7024 electrode exhibited easy arc opening and reopening but did not present good stability. Finally, it was observed that the optimal current range reduced as depth increases.
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ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering
June 8–13, 2003
Cancun, Mexico
Conference Sponsors:
- Ocean, Offshore, and Arctic Engineering Division
ISBN:
0-7918-3683-5
PROCEEDINGS PAPER
Study of Porosity Location in Fresh Water Wet Welds Available to Purchase
Ezequiel C. P. Pessoa,
Ezequiel C. P. Pessoa
Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
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Alexandre Q. Bracarense,
Alexandre Q. Bracarense
Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
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Stephen Liu,
Stephen Liu
Colorado School of Mines, Golden, CO
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Faustino Pe´rez-Guerrero
Faustino Pe´rez-Guerrero
Colorado School of Mines, Golden, CO
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Ezequiel C. P. Pessoa
Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
Alexandre Q. Bracarense
Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
Stephen Liu
Colorado School of Mines, Golden, CO
Faustino Pe´rez-Guerrero
Colorado School of Mines, Golden, CO
Paper No:
OMAE2003-37291, pp. 185-191; 7 pages
Published Online:
January 23, 2009
Citation
Pessoa, ECP, Bracarense, AQ, Liu, S, & Pe´rez-Guerrero, F. "Study of Porosity Location in Fresh Water Wet Welds." Proceedings of the ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering. Volume 3: Materials Technology; Ocean Engineering; Polar and Arctic Sciences and Technology; Workshops. Cancun, Mexico. June 8–13, 2003. pp. 185-191. ASME. https://doi.org/10.1115/OMAE2003-37291
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