Advanced Metalworking Solutions for
Naval Systems that Go in Harm's Way
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Manufacturing Large Marine Structures

Objective

Establish optimum welding procedures, including consumable-type selection, definition of operational envelopes, and verification of welded joint performance to provide reliable performance of HSLA-65 welded joints for ship construction.

Technical Approach

Expand on existing welding technologies * Define optimum welding procedures using existing consumables that will enable the use of HSLA-65 for primary hull and secondary structural applications * Conduct welded joint performance analyses * Verify that adequate resistance to service loading conditions can be achieved by the developed optimized welding procedures * Work closely with NAVSEA, Naval Surface Warfare Center-Carderock Division (NSWC-CD), Newport News Shipbuilding, steel producers, and consumables producers to ensure proper technology implementation

Benefits

Even though few redesigns are being made on CVN-77 where HSLA-65 can be used to save weight, HSLA-65 is primarily planned as a direct material replacement in certain applications to gain fabrication experience before committing the hull of CVNX2 to HSLA-65. These applications will gain immediate benefit from increased strength and toughness through use of HSLA-65. Full implementation of HSLA-65 could yield an estimated weight savings of at least 4,300 tons. Using Newport News Shipbuilding’s estimated $10-thousand cost avoidance per ton of weight reduction would result in an estimated $34-million cost avoidance for CVNX2.

Implementation

An integrated project team consisting of NAVSEA, NSWC, Newport News Shipbuilding, steel producers, consumable producers, and the National Center for Excellence in Metalworking Technology (NCEMT) was assembled to transition the project results into the production of Naval aircraft carriers and surface combatants. Technology demonstration, technical reports, and welding process specifications were used to transition the technology to industry.

Status

Completed