The Day reports the Metal Trades Council passed the four-year contract Tuesday despite opposition from some members who said they wanted a better deal.
The union represents about 2,700 shipyard workers, including boilermakers, office and professional employees.
More than 2,100 members voted and more than 85% approved the contract.
Electric Boat has facilities in Connecticut and Rhode Island.
Some union members wanted more than a 3% raise. About 100 union members picketed outside the shipyard Saturday during a submarine christening ceremony.
Electric Boat told employees that the contract offer is one of the most competitive in the region and for all shipbuilders. The terms are effective immediately.
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