Spark plug production comprises resistance welding earth electrode of nickel alloy containing chromium and aluminum to metal envelope containing central electrode

摘要

The production of a spark plug (100), made up of a metal envelope (1), an electrically insulated central electrode (3) and an earth electrode (4) facing the central electrode with the interpolation of a spark gap (5), comprises: (a) elaborating the earth electrode, made up of a nickel-based alloy containing 10% or more of chromium and 1.5% or more of aluminum; and (b) connecting the electrode to the metal envelope by resistance welding, in an oxygen-free atmosphere. An Independent claim is also included for a spark plug produced as above.