Method of hard facing a substrate, and weld rod used in hard facing a substrate
AssigneeDresser Industries, Inc.
InventorJames Edward Boyce
Life of this patent
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Abstract
A weld rod is prepared by placing a plurality of tungsten carbide/cobalt nuggets, preferably mixed with loose material, into a steel tube. The nuggets are previously sintered and have a generally ellipsoidal shape. A substrate is hard faced by progressively melting the weld rod onto the surface to be hard faced, and allowing the melted material to solidify on the surface.
Claims39
An article of manufacture, comprising a nugget formed of a sintered mixture of hard, nonmetallic particles embedded in a metallic matrix, the nugget having a generally ellipsoidal shape wherein the nugget has a major axis and a minor axis, and wherein the ratio of the length of the major axis to the length of the minor axis is from about 1.2:1 to about 3.5:1.
An article of manufacture, comprising:
- a steel tube closed at the ends;
- and
- a plurality of generally ellipsoidal nuggets within the steel tube, each nugget being formed of a sintered mixture of hard, nonmetallic particles embedded in a metallic matrix.
A method of hard facing an article, comprising the steps of:
- providing an article having a substrate surface that is to be coated with a hard facing;
- providing a hard-facing rod, the hard facing rod comprising a plurality of generally ellipsoidal nuggets in a steel tube, each of the nuggets comprising a sintered mixture of hard, nonmetallic particles embedded in a metallic matrix;
- progressively melting the hard-facing rod to form weld metal;
- and
- applying the weld metal to the substrate surface and solidifying the weld metal in contact to the substrate surface.
Dependencies are inferred from the claim text.