Production of an annular groove of the base of a steel piston of an internal combustion engine comprises providing the groove with a layer absorbing the energy of laser beams before or during hardening and impinging with laser beams

摘要

Production of an annular groove of the base (1) of a steel piston of an internal combustion engine comprises providing the groove with a layer absorbing the energy of laser beams (4) before or during hardening and impinging the layer with laser beams. An independent claim is also included for a piston of an internal combustion engine.