Offshore Platform Repaired by Wet Welding Weathers Huricane Lili

DeFranco, Samuel J.; Reynolds, Thomas H.; Buescher, Frank J; O’Connor, Patrick

doi:10.1115/omae2003-37283

Cited by 2 publications

(2 citation statements)

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“…There are several damage repair methods, among them, one consists on removing the cracking region by grinding [4,5].This method may retard fracture propagations. The grinding may be filled by wet welding, which has been applied in the North Sea [6][7][8][9][10] and in the Gulf of Mexico [11][12][13][14]. Authors have carried out research work to quantify changes on the resistance, ductility and toughness of materials used in tubular joints combining grinding and wet welding [15].…”

Section: Introductionmentioning

confidence: 99%

Combination of Grinding and Wet Welding to Repair Localized Cracking in T-Welded Connections

Méndez

Cuamatzi-Meléndez

Hernández

2014

MSF

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This paper presents experimental research work on the combination of grinding and wet welding techniques to repair T-welded connections employed in the construction of offshore structures. A longitudinal rectangular grinding profile was performed at the weld toe of T-welded connections for localized cracking material removal. Two different grinding depths of 6 mm and 10 mm were performed in the welded connections to eliminate two different level of damage depth. Subsequent wet welding was applied in the grinded region to repair the grinded material. The wet welding was performed in a hyperbaric chamber simulating three different water depths: 50 m, 70 m and 100 m (shallow water). Once the combined repair techniques were performed, further experimental work was done to characterize the mechanical behavior of the repaired structures. The mechanical characterization was done with tensile, Charpy tests and Vickers Hardness tests. The region of interest from the structures was the weld toes the grinded-wet welding repair of the T-welded connections. Subsequent scanning electron microscopy (SEM) was also performed to examine the developed microstructures in the T-welded connection. The results showed that the combination of the repair techniques can restore the mechanical properties of the damaged structures. This was demonstrated by the measurement of the ultimate tensile strength, which were similar to those measured with no repair applied techniques. But the Charpy energy values were quite lower to those previously measured. This behavior was attributed to the level of porosity formed by the high level of gases created during the welding process for the simulated water depths, which were more severe at the higher water depth resulting in pore formation

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Section: Introductionmentioning

confidence: 99%

Combination of Grinding and Wet Welding to Repair Localized Cracking in T-Welded Connections

Méndez

Cuamatzi-Meléndez

Hernández

2014

MSF

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“…In summary of this section, all developments witnessed in the last 50 years have strengthened UWW as a viable technology, producing welds with higher quality, greater acceptance, and increased application in offshore structural repair at shallow water depths (Refs. 75,76).…”

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confidence: 99%

The State of the Art of Underwater Wet Welding Practice: Part 2

Pessoa¹,

LIU²

2021

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Developments in underwater wet welding (UWW) over the past four decades are reviewed, with an emphasis on the re-search that has been conducted in the last ten years. Shielded metal arc welding with rutile-based coated electrodes was established as the most applied process in the practice of wet welding of structural steels in shallow water. The advancements achieved in previous decades had already led to control of the chemical composition and microstructure of weld metals. Research and development in consumables formulation have led to control of the amount of hydrogen content and the level of weld porosity in the weld metal. The main focus of research and development in the last decade was on weldability of naval and offshore structural steels and acceptance of welding procedures for Class A weld classification according to American Welding Society D3.6, Underwater Welding Code. Applications of strictly controlled welding techniques, including new postweld heat treatment procedures, allowed for the welding of steels with carbon equivalent values greater than 0.40. Classification societies are meticulously scrutinizing wet welding procedures and wet weld properties in structural steels at depths smaller than 30 m prior to qualifying them as Class A capable. Alternate wet welding processes that have been tested in previous decades — such as friction stir welding, dry local habitat, and gas metal arc welding — have not achieved great success as originally claimed. Almost all of the new UWW process developments in the last decade have focused on the flux cored arc welding (FCAW) process. Part 1 of this paper covered developments in microstructural optimization and weld metal porosity control for UWW. Part 2 discusses the hydrogen pickup mechanism, weld cooling rate control, design, and qualification of consumables. It ends with a description of the advancements in FCAW applications for UWW.

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Offshore Platform Repaired by Wet Welding Weathers Huricane Lili

Cited by 2 publications

References 0 publications

Combination of Grinding and Wet Welding to Repair Localized Cracking in T-Welded Connections

Combination of Grinding and Wet Welding to Repair Localized Cracking in T-Welded Connections

The State of the Art of Underwater Wet Welding Practice: Part 2

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