Abstract: A retaining system (100) for a DTH hammer drill bit (25) having an outer surface with a plurality of stops (31) at an up-hole end (29) of the drill bit (25) the stops projecting radially outward from the outer surface and spaced by respective gaps (35). The retaining system has a ring (102) which is configured to pass over the stops (31) when in a first rotational position relative to the drill bit (25). However when the ring (102) is in a second rotational position relative to the drill bit (25) it prohibits passage of the stops (31) through the ring (102).

Abstract: This method combines etching of the strip by passing through reduced pressure electric plasma discharge zones and the direct off-line dip-coating of the etched strip in a bath of molten aluminum.The strip brought to cathode potential defilades continuously in registration with the magnet elements and anodes of a plurality of consecutively disposed magnetron devices and, therefore, directly into said molten metal bath.

Abstract: Tubes partly filled with a blend of two or more metals in powder form and containing loose hard bodies are subject to linear and oscillating motion; under the impact of the bodies knocking against each other, the metals alloy together mechanically and form a patterned amorphous coating on the surface of the clashing bodies.

Abstract: Efficient in-situ stirring in pressure casting is difficult. Here, the casting die is provided with internal mechanical agitating means which allow homogeneous distribution of the partially solidified phase at temperatures near liquidus and of optionally incorporated reinforcing materials. One form of agitating means is a masher type plate which moves back and forth within the mould.

Abstract: A molten metal is placed in contact with a bed of moving beads. The molten metal breaks up into fine particles which are rapidly cooled in contact with the beads and consequently acquire a structure which is typical for such rapid cooling.

Abstract: The metal substrate (4) is coated with a coating (6) of another metal of alloy of 4-50 .mu.m thickness by deposition of a molten metal or alloy (5) through a nozzle (2), the melting temperature of this metal or alloy being lower than that of the substrate metal. This coating comports, starting from the substrate, a layer of intermetallic compound of thickness comprised between 0.5 and 4 .mu.m, within a limit not exceeding 40% of the total thickness, the remainder of the coating being formed of the initial coating metal of alloy in a proportion of 97 to 99.5% by weight.

Abstract: The metal substrate (4) is covered with a coating (6) consisting of another metal or alloy having a thickness of 4 to 50 .mu.m, by deposition of molten metal or alloy (5) through a nozzle (2), this melting point [sic] being lower than that of the substrate metal. This coating comprises, at the interface with the substrate, a layer of intermetallic compound with a thickness of between 0.5 and 4 .mu.m not exceeding 40% of the total thickness, the remainder consisting of the initial metal or alloy used for the coating, in a proportion of between 97% and 99.5% by weight.