Abstract: A system and method is provided for protecting the exterior surface of drill pipe bodies from abrasion and wear during drilling operations alternatively using a hardbanded pipe collar inserted into a drill pipe body; a hardbanded pipe sleeve slid over a section of the drill pipe body; or a hardbanded circumferential built up section of the drill pipe body.

Abstract: Disclosed are methods of facing a surface of a weldable iron based material with a consumable iron based electrode and alloy forming elements by creating an electric arc between the electrode and the surface of the weldable base material effective to form a weld puddle of which the weldable base material provides from about 35% to about 80% by weight, and preferably a major portion, of the weld puddle formed by the electrode and the base plate and by depositing and melting a predetermined quantity of alloy forming elements in the weld puddle to form an alloy abrasion resistant or corrosion resistant facing. Also disclosed are plates having abrasion or corrosion resistant surfaces in which from about 35% to about 80% and preferably a major portion of the weld puddle formed by the electrode and the base material is the weldable iron based material.

Abstract: Disclosed are methods of hardfacing and hardfaced tool joints used for connecting together drilling pipe for drilling bore holes in the earth, such as drilling to possible oil and gas formations. The hardfacing is welded to the outer surface of the box member of the tool joint and forms a surface harder than silicious earth particles but a surface which does not cut casing through which the drilling pipe and tool joints move. Hardfacing alloys having the foregoing properties contain primary carbides in a matrix which are present in an amount to form a plurality of cracks of not less than one in 3 inches on cooling from molten to solid state are satisfactory. Such cracking causes no damage to the box member, provides an indication of the primary carbides present and hence the abrasion resistance of the hardfacing and provides a long wearing service life for the box member.