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  • "Stir welding plunges a rapidly rotating pin about the size of a pencil into the joint between two panels with more than 5,000 pounds of force per square inch; the friction makes the alloy pliable, and the rotation forces grains of metal to mingle behind the pin as it crawls up the joint." --"Rocket Builder," Wired (17.04, 26)

    April 30, 2009