Patent ID: 8496029

Claim:
A flow substrate comprising: a substrate body formed from a solid block of a first material, the substrate body having a first surface and a second surface opposing the first surface; a plurality of pairs of component conduit ports defined in the first surface of the substrate body; a plurality of fluid pathways extending between each respective pair of component conduit ports and in fluid communication with each component conduit port of the respective pair of component conduit ports, each respective fluid pathway being formed in the second surface of the substrate body; and at least one cap formed from a second material, the at least one cap having a first surface that is constructed to seal at least one fluid pathway of the plurality of fluid pathways, and a second surface opposing the first surface of the at least one cap; wherein the substrate body includes a weld formation formed in the second surface of the substrate body and surrounding the at least one fluid pathway to facilitate welding of the at least one cap to the substrate body along the weld formation, the weld formation including a recessed flat wall surface surrounding the at least one fluid pathway and a swaged lip, the recessed flat wall surface being recessed from the second surface of the substrate body and having an inner edge and an outer edge, and the swaged lip being disposed adjacent the inner edge of the recessed flat wall surface.