Abstract: A hard-clad coating composition for hardfacing is described. Also described is a weld hardfacing method for applying a coating composition to a base metal, and an apparatus for introducing the coating composition to the weld process.

Abstract: A hard-clad coating composition for hardfacing is described. Also described is a weld hardfacing method for applying a coating composition to a base metal, and an apparatus for introducing the coating composition to the weld process.

Abstract: A hard-clad coating composition for hardfacing is described. Also described is a weld hardfacing method for applying a coating composition to a base metal, and an apparatus for introducing the coating composition to the weld process.

Abstract: An isotherm sensor tracks space vehicle temperatures by a thermal protection system (TPS) material during vehicle re-entry as a function of time, and surface recession through calibration, calculation, analysis and exposed surface modeling. Sensor design includes: two resistive conductors, wound around a tube, with a first end of each conductor connected to a constant current source, and second ends electrically insulated from each other by a selected material that becomes an electrically conductive char at higher temperatures to thereby complete an electrical circuit. The sensor conductors become shorter as ablation proceeds and reduced resistance in the completed electrical circuit (proportional to conductor length) is continually monitored, using measured end-to-end voltage change or current in the circuit. Thermocouple and/or piezoelectric measurements provide consistency checks on local temperatures.

Abstract: Well completion system providing for an enhanced bond between a well casing and the surrounding cement sheath. The system comprises a casing string disposed within a well extending to a subterranean location within the earth's crust. A metal ribbon is disposed about the outer surface of the casing to provide a wrapping having a series of helical turns along the length of the casing. A cement sheath in the annulus about the casing encompasses the wrapping and enters into openings therein to provide a bond between the cement and the outer surface of the casing. The metal ribbon may take the form of an expanded metal ribbon having a staggered mesh structure so that a portion of the ribbon stands off from the surface of the casing.

Abstract: Well completion system providing for an enhanced bond between a well casing and the surrounding cement sheath. The system comprises a string of casing disposed within a well extending to a subterranean location in the earth. A wrapping of a metal wire is disposed about the outer surface of the casing in a conformation providing a plurality of helical turns which crisscross on another. A cement sheath in the annulus about the casing encompasses the metal wire to provide an enhanced bond between the cement and the outer surface of the casing. The wire may be provided with a plurality of protrusion elements which extend into the cement sheath to further increase the casing cement bond.