The Baltimore Sun is reporting that the Ravens have signed six-year veteran Chad Slaughter to a one-year contract.  The O-lineman will add depth to a line that has already had some injuries.  The team tried to come to terms with lineman with John Welbourn, a four-year starter for the Chiefs, but nothing could be reached.  The paper is reporting that  Welbourn sat in the team hotel for hours as the sides tried to agree to a contract, and Welbourn walked away from a one-year deal worth the NFL minimum. Slaughter can play on either side of the line, and is a big boy at 6-8, 340 pounds.  “I think they were looking to find someone with experience,” said Angelo Wright, Slaughter’s agent.