Abstract: An apparatus for coating an interior surface of a conduit. The apparatus has a center rod with a substantially square cross-section that extends axially along the interior surface of the conduit. An index carriage slidably engages the substantially square cross-section of the center rod so that the index carriage maintains a fixed rotational orientation relative to the center rod. An index motor having a variable index position is carried by the index carriage. A coating device for coating the interior surface of the conduit is rotatably attached to the index carriage and connected to the index motor. As such, the coating device has an elevation position that corresponds to the index position of the index motor. A drive motor carried by a drive carriage propels the drive carriage longitudinally along the center rod.

Abstract: An improved cone crusher for crushing rock and the like has a welded metal hardfacing pattern made by welding beads of chromium carbide or similar hardfacing material to selected portions of its crushing surfaces. Tungsten carbide particles are introduced into the weld puddle as the beads are deposited. Predetermined spacing is maintained between adjacent beads to expose portions of the crushing surfaces. The beads can be deposited in recessed grooves in the crushing surfaces for increased lateral support. In the preferred embodiment, the beads are welded in a concentric circular pattern on the mantle and bowl liner of the cone crusher.