Case Study – Cruise Ship Underwater Wet Weld Repair

Technical Situation

Cruise Ship, length 290 meter, 113,323 Tons Gross Tonnage

3 month out of drydock, galvanic corrosion caused heavy cavitation/erosion damage on PORT and STBD side rudders.

Section loss up to 100% was repaired by build-up welding with underwater wet welding techniques. One of the rudders was filled with water.

SGS together with cruise line and class developed a repair plan involving the qualification of underwater wet welded groove weld procedures to AWS D3.6 Class A requirements.

Over a time period of three month SGS crew sailed with the vessel, during port stops divers were deployed to restore the wasted material.

Repair was considered permanent and was performed without interrupting the itinerary of the vessel

Cruise Ship, length 325 meter, 145,655 Tons Gross Tonnage.

During a night grounding the skeg from the STBD azipod was ripped off.

SGS worked together with the OEM and the Cruise line to install a new skeg.

A new skeg was manufactured by the OEM and installed with CJP welds by SGS welder divers employing underwater wet welding techniques.

SGS welder divers sailed with the vessel. Repairs were performed during regular port stop without interrupting the itinerary of the vessel.