The slim lines of the upcoming iMac models would be impossible if it weren't for a bit of intellectual property from Cambridge, England-based TWI.
TWI developed a technique called friction-stir welding in 1991 that doesn't require melting metals to join them together. Through the use of a rotating tool made out of a wear-resistant material, metals are softened and then merged under frictional heat. The method has been used in the aerospace industry for years to produce rocket propellant tanks, airplane wings, and is used at Denver's Lockheed Martin facilities on the
