Flat laminar gasket, e.g. for cylinder head, has aperture machined through coating at welding point

摘要

The gasket (12) has several sheet metal layers welded to each other at one point (14) or more. At least one has a partial coating (20a) of lower electrical conductivity that the sheet layers. An aperture (34) is machined through the coating at the weld point. The weld joint can then be created by electrical resistance welding.