Abstract: An apparatus and related method for cooling a hard metal applied in a molten or semi-molten state to the surface of a metal substrate employ a chill block chilled by a cryogenic coolant conducted through a coolant passage in the chill block with at least one ejector port in communication with the coolant passage arranged to eject cryogenic coolant from the chill block onto the hand metal for further cooling the hard metal. An alloy steel substrate preheated to 300 to 600 degrees Fahrenheit has a hard metal applied thereto by an arc welding process.

Abstract: An apparatus and related method for cooling a hard metal applied in a molten or semi-molten state to the surface of a metal substrate employ a chill block chilled by a cryogenic coolant conducted through a coolant passage in the chill block with at least one ejector port in communication with the coolant passage arranged to eject cryogenic coolant from the chill block onto the hand metal for further cooling the hard metal. An alloy steel substrate preheated to 300 to 600 degrees Fahrenheit has a hard metal applied thereto by an arc welding process.

Abstract: A hardfacing apparatus includes a deposition head including a heat source, a hardfacing material source, and a chill block having a chill block surface. The deposition head is positioned at a location so as to deposit a mass of the hardfacing material onto the workpiece surface. The chill block is positioned remote from the deposition head with the chill block surface in a facing-but-spaced-apart relation to the workpiece surface, separated from the workpiece surface by a gap having a dimension between the chill block and the workpiece surface of a standoff distance D.sub.S. Molten hardfacing material is deposited onto the workpiece surface from the deposition head. Simultaneously, the workpiece surface is moved relative to the hardfacing apparatus so that the molten hardfacing material passes into the gap and is molten as it enters the gap.

Abstract: There is disclosed a process for forming a hardfacing surface including particulate refractory metal carbide by directing a plasma transferred arc against a wear surface of an element and passing a powder comprised of refractory metal carbide particles admixed in a suitable hard metal matrix through the plasma arc to thereby form on the wear surface of the element a hardfacing surface including particulate refractory metal carbide of a thickness of from 0.04 to 0.25 inches.