Fatigue Crack Growth Rate in Underwater Wet Welds: Out of Water Evaluation

Fatigue cracks propagation characteristics of welds produced in conventional conditions (welds made out of water) and underwater condition (Underwater wet welding) were evaluated out of the water. The growth rates of fatigue crack da/dN showed a significant dependency on the density and distribution...

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Bibliographic Details
Published in:Soldagem & Inspeção 2015-12, Vol.20 (4), p.403-411
Main Authors: Arias, Ariel Rodriguez, Bracarense, Alexandre Queiroz
Format: Article
Language:Portuguese
Subjects:
Crack propagation
Density
Fatigue failure
Fracture mechanics
Offshore structures
Underwater
Welded joints
Welding
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Summary:Fatigue cracks propagation characteristics of welds produced in conventional conditions (welds made out of water) and underwater condition (Underwater wet welding) were evaluated out of the water. The growth rates of fatigue crack da/dN showed a significant dependency on the density and distribution of pores, factors which may vary significantly with the welding process and environment. Variations in the propagation speed of the fatigue crack were correlated with the analysis of the fracture surface on the stable propagation crack zone. The results of this study showed that the underwater wet welding procedure produces weld metal resistant to fatigue that is suitable to be used at low stresses applied to offshore structures.Original Abstract: As caracteristicas de propagacao de trinca por fadiga de soldas produzidas em condicoes convencionais (Soldas feitas fora da agua) e de reparo subaquaticas (Solda subaquatica molhada) foram avaliadas fora da agua. As velocidades de crescimento da trinca por fadiga da/dN mostraram uma sensivel dependencia com a densidade e distribuicao de poros, fatores que variam significativamente com o processo de soldagem e meio ambiente. Variacoes na velocidade de propagacao da trinca por fadiga foram correlacionadas com a analise da superficie de fratura na zona de propagacao estavel da trinca. Os resultados deste estudo mostram que o procedimento de soldagem subaquatica molhada produz metal de solda resistente a fadiga que e adequado para uso em baixas tensoes aplicadas em estruturas offshore.
ISSN:0104-9224
1980-6973
DOI:10.1590/0104-9224/SI2004.07