P. Takis Veliotis has been designated executive vice president-marine and international operations of General Dynamics Corp., according to a recent announcement by David S. Lewis, chairman and chief executive officer. The post, according to Mr. Lewis, is a new one that includes responsibility for the organization's shipbuilding and major corporative expansion.

Mr. Veliotis, who joined General Dynamics in 1973 as president and general manager of the company's Quincy Shipbuilding Division, has most recently been general manager of the Electric Boat Division. He will be succeeded as general manager at Electric Boat by Fritz G. Tovar, who has been general manager of Electric Boat's Quonset Point, R.I., facility. Mr. Tovar will be succeeded by William W. Bennet who has been assistant general manager at Quonset Point.