A combination of a substrate piece and a component fitted inside the substrate piece, the component being hermetically isolated from the exterior of said piece, the piece comprising: a. at least two substrate layers (10, 11), b. a conductor layer fitted between said substrate layers, c. a component fitted inside the substrate piece, the component being hermetically isolated from the exterior of said piece, d. a first conductor made of the conductor layer, the first conductor extending from the periphery of said piece to the component for providing an electrical connection, and wherein a hermetic feedthrough comprising the first conductor is fitted between the substrate layers (10, 11), characterized in that e. the substrate layers (10, 11) and the conductor layer have a common interface region, the substrate layers (10, 11) and the conductor layer are pressed together and joined with each other by means of at least one weld made with a focused laser beam, wherein the at least one weld encircles the component at the height level of the common interface region, and wherein each weld extends substantially from a first edge (1.1) of a conductor to its second edge or to a second edge (1.2) of another conductor adjacent to it, such that said hermetic feedthrough comprises a zone, which is located between the first conductor and a weld (3,3'), wherein joints located within said zone between the layers are not welded together, f. opposite surfaces of the substrate layers (10, 11) facing towards the conductor, a first surface (10.1) and a second surface (11.2), are constricted against the conductor due to thermal tensions caused by welding heat, wherein the joints between the conductor and said surfaces, as well as all other joints remaining in the area between adjacent welds (3, 3'), are hermetic. a. at least two substrate layers (10, 11), b. a conductor layer fitted between said substrate layers, c. a component fitted inside the substrate piece, the component being hermetically isolated from the exterior of said piece, d. a first conductor made of the conductor layer, the first conductor extending from the periphery of said piece to the component for providing an electrical connection, and wherein a hermetic feedthrough comprising the first conductor is fitted between the substrate layers (10, 11), characterized in that e. the substrate layers (10, 11) and the conductor layer have a common interface region, the substrate layers (10, 11) and the conductor layer are pressed together and joined with each other by means of at least one weld made with a focused laser beam, wherein the at least one weld encircles the component at the height level of the common interface region, and wherein each weld extends substantially from a first edge (1.1) of a conductor to its second edge or to a second edge (1.2) of another conductor adjacent to it, such that said hermetic feedthrough comprises a zone, which is located between the first conductor and a weld (3,3'), wherein joints located within said zone between the layers are not welded together, f. opposite surfaces of the substrate layers (10, 11) facing towards the conductor, a first surface (10.1) and a second surface (11.2), are constricted against the conductor due to thermal tensions caused by welding heat, wherein the joints between the conductor and said surfaces, as well as all other joints remaining in the area between adjacent welds (3, 3'), are hermetic.