05/06/2026
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During World War II, the United States needed cargo ships faster than any nation had ever built them before. German U-boats were sinking Allied vessels faster than they could be replaced, and the entire war effort depended on keeping supply lines open across the Atlantic. The solution was the Liberty Ship program — a standardized welded steel cargo ship design that could be built with assembly-line efficiency in American shipyards. At their peak, American workers were completing one Liberty Ship every single day. But on November 12, 1942, the workers at Kaiser Shipyards in Richmond, California set a record that has never been broken.
The SS Robert E. Peary was built in 4 days, 15 hours, and 27 minutes from keel-laying to launch. The ship weighed 14,000 tons. It required thousands of individual welds across hundreds of structural components. Workers operated in overlapping shifts around the clock with no breaks in production. The previous record had been 10 days. The SS Peary smashed it by more than half. It was not a flimsy showpiece — the ship went on to serve actively in both the Atlantic and Pacific before being scrapped in 1963 after a full operational career.
What made the Liberty Ship program possible was the switch from riveting to welding as the primary method of ship construction. Welded hulls could be prefabricated in sections and assembled far faster than riveted ones. The entire shipbuilding industry was transformed in a matter of years. Over 2,700 Liberty Ships were built between 1941 and 1945. They carried the food, ammunition, tanks, fuel, and supplies that kept Allied forces fighting across every theatre of the war. The most important ships ever built were not battleships or aircraft carriers. They were welded cargo ships built by ordinary workers moving as fast as human hands have ever worked.
Follow for the welds that changed the course of history.
