A major scandal is brewing in the U.S. Navy after lawmakers ordered an investigation into reports of dangerous welding flaws on submarines and aircraft carriers. These aren’t just any ships—they are some of the most powerful vessels in the Navy, and some are already in use while others are still being built. The problem? Faulty welding that may have been done intentionally.

This alarming news came to light when Newport News Shipbuilding, one of the main companies that builds U.S. Navy sh...