Manufacturing Industry

Aluminum bumpers assembled by electric current from coils.(PROCESS TECHNOLOGY)(Brief article)

Advanced Materials & Processes, May, 2007

Aluminum car bumpers can be assembled through an electric current generated by an electromagnetic coil in a process developed by Kobe Steel Ltd., Japan. The process is designed for the stays that attach the bumper beam to the chassis. The stays consist of a pipe fitted through a plate. The pipe and plate are made of aluminum and are bound together by running a current of several thousand amperes through an electromagnetic coil placed inside the pipe.

The electromagnetic force causes the pipe to expand and flange out slightly on either side of the plate, creating a tight fit. This technique eliminates the need for welding and, depending on the shape of the stays, can reduce assembly time by as much as half. The current sent through the coil is built up in a...

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