About 55 people had to leave when the fire broke out as welding was being done on the outside of the Trafalgar class submarine, said the Royal Navy.

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Before heading to Iowa State University for a doctorate, he enjoyed a three-month stint as a welding inspector at Finland's Oy Tampella Ab, a manufacturer of industrial parts.

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Friction stir welding is at least twice as strong and 20 times as fast as hand-riveting.

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Despite the upheaval of the past four years, the same employees and suppliers are for the most part grinding, polishing and welding for same customers just as they ever did.

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Instead of welding several pieces of steel together as reinforcement (which adds weight), those important structural elements are heated to 900 degrees Fahrenheit, then stamped into the desired shape and rapidly cooled almost simultaneously.

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