A spark plug, which carries electric current for igniting charge within the engine, has a metal threaded shell, electrically insulated from a central electrode by a ceramic insulator. The central electrode protrudes through the ceramic insulator into the combustion chamber.
The anti-abrasive, electrical resistance & temperature resistance properties of ceramic qualifies it for insulator material.
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Projection welding process is a type of resistance welding process where welding is localised by means of projections or raised sections present on one or both of the workpieces to be joined. One of the important application of projection welding method is in auto body assembly which consists of welding together more than 200 metal sheet parts.
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