Underwater Welding techniques

Priya, V. Parvathi; Mohan, Mayumi; Dhanasekar, J.

doi:10.35940/ijeat.f1166.0886s219

Cited by 1 publication

(1 citation statement)

References 3 publications

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“…It is noteworthy to mention that the total area of the deposited metal, in the wet welding process, is different for each evaluated condition. In the literature [17][18][19][20][21][22][23][24][25][26], it was reported different levels of porosity obtained in the weld beads during the wet welding process, welding techniques and exposures employing electrodes with aggregated materials to the coating vs the porosity level obtained in previous works [13]. In previous work E6013 electrodes were employed with no aggregated materials to the coating, and desired microstructure with reduced porosity level was obtained, which improved the mechanical properties of the deposited wet welding metal.…”

Section: S-n Curves Correlation With Mechanical Characterization Datamentioning

confidence: 99%

Fatigue Behaviour of Offshore T-Weld Connections Repaired by Grinding and Wet Welding

Terán-Méndez

Melendez

Medina-Almazàn

et al. 2023

MSF

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Fixed platforms employed in oil & gas shallow waters industry are subjected to dynamic loads created by winds, waves and currents. However, such loads can produce fatigue damage, like localized cracking in the weld toes of T-welded connections of the submerged structures of fixed platforms. Therefore, to repair localized cracking, a technique that combines grinding and wet welding can be applied at the weld toes of submerged structural connections. Accordingly, in the present work it is presented a methodology to restore the fatigue life of T-welded connections fabricated with A36 plate steel. Consequently, T-welded connections samples were prepared and tested under intact, grinding and grinding-wet-welding repair conditions. For the repair conditions, the weld toes were grinded 6 mm and 10 mm, and wet welding was deposited to fill the grinded material in a hyperbaric chamber, which simulated 50 m, 70 m and 100 m water depths. Afterwards, the repaired connections were subjected to fatigue loads, and the S-N curves were measured for intact and repair conditions. Fatigue results showed that the combined repair technique was able to restore the fatigue life of T-welded connections for a maximum water depth of 50 m. Nonetheless, for water depths of 70 m and 100 m the fatigue life was smaller than for 50 m, but higher compared to the only grinding repair condition.

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