R. MAISONNEUVE, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY R. MAISONNEUVE, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Computer-controlled welding. A shower of orange sparks from an arc-welding robot appears behind a computer screen. The screen display monitors the job in progress. Arc-welding uses electricity to melt metals. Electrodes carrying high-voltage current are connected to the welding rod and the metal to be welded. When the rod is held near the metal, an arc of lightning bridges the gap, gener- ating an intense heat that melts the metal. This high-precision welding rod is moved by a computer- controlled robot and monitored by a camera (black, centre right).
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