Abstract: A locally reinforced honeycomb core panel having a honeycomb core, at least one coiled insert in at least one honeycomb cell and at least one face sheet. These components are formed from high temperature resistant metals. Elongated foil strips are coiled into cylindrical shapes having diameters slightly less than the width of individual cells in the honeycomb panel and heights no greater than the depth of the cells. These coiled inserts are placed in individual cells in selected portions of the honeycomb core to locally improve density, strength and thermal transfer characteristics of the panel. The coiled inserts have sufficient resiliency so that when they are inserted into cells and allowed to unwind, they press tightly against the cell inside wall even if the cell shape has been distorted in handling. The cells are held in place by the face sheet(s) bonded to the honeycomb core. If desired, the coils may be bonded to the cell walls by diffusion bonding or brazing.

Abstract: A process for selectively electroplating the nodes of dimpled titanium material. A sheet of clean dimpled titanium material is placed on a electrolyte saturated absorbent fabric covered block of conductive material. A flat sheet of metal, such as, stainless steel is placed on the opposite surface of the dimpled sheet to provide dead weight to hold only the nodes of the dimpled sheet in contact the absorbent material the dimpled sheet serving as one electrode for the electroplating process. The conductive block being the other electrode. Current is then passed through the electrolyte solution between the electrodes causing only the nodes to become plated. The electrolyte may contain, for example, copper or nickel in solution. A plating mask in the form of a frame may be placed between the flat sheet of metal and the dimpled sheet to provide uniform plating of the node surfaces.