On Thursday, Lockheed Martin officials said they hired more temporary workers. That brought the number to 70 temps working in manufacturing areas of the plant.
So far, the company has 145 temporary workers who are doing jobs that union members did before the strike.
More temporary workers are expected to be added on Monday, but the company has not determined how many more will be brought in.
About 3,500 machinists are picketing over health care costs and pension benefits.
They went to the picket line on April 23.