Electric heating – Metal heating – For deposition welding
Patent
1991-04-18
1992-09-15
Shaw, Clifford C.
Electric heating
Metal heating
For deposition welding
219 7612, B23K 904
Patent
active
051479966
ABSTRACT:
A method is provided for applying grooved bands of hardsurfacing on a tool joint for earth boring drill pipe. The hardfacing of the tool joint has tungsten carbide granules in an alloy steel matrix. The tool joint is rotated and an arc between an electrode and the tool joint is provided to create a weld puddle. The electrode is reciprocated parallel to the tool joint axis and the granules are fed into the weld puddle with the puddle being applied to the grooved bands around the exterior of the tool joint to a groove depth of from between about 0.75 inches to about 0.150 inches. The feed of the granules into the weld puddle is discontinued and the weld puddle is continued to be applied around the tool joint and in the grooved bands to provide a protruding substantially tungsten carbide free hardfacing surface about the outer diameter of the tool joint of from between about 0.050 inches to about 0.175 inches, and the hardfacing surface is machined down to substantially the outer diameter of the tool joint. A tool joint having the above charateristics also is provided.
REFERENCES:
patent: 4228339 (1980-10-01), Scales et al.
patent: 4243727 (1981-01-01), Wisler et al.
patent: 5010225 (1991-04-01), Carlin
Grant TFW, Inc.
Shaw Clifford C.
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