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Information related to the welding of thick titanium alloy plate for submarine hull applications is presented in this paper. The weldability of titanium alloy, welding procedures, and mechanical properties of welded joints are discussed. Welding operations are expected to present the greatest problems in fabricating titanium submarine hulls. Cutting, machining, and forming are not expected to cause major problems, but they will be more difficult to perform on titanium than on the low alloy steels now used in submarine hulls.