Method of hardfacing tool joints
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United States of America Patent
Stats
-
Oct 14, 1980
Grant Date -
N/A
app pub date -
Dec 28, 1978
filing date -
Dec 28, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved method for hardfacing tool joints for earth boring drill pipe. Annular bands of hardfacing are applied by an apparatus that creates an arc between a consumable steel wire and the tool joint. The steel wire is reciprocated across the width of the band as the tool joint is rotated. Granules of tungsten carbide flow by gravity from a hopper into the weld puddle. The flow of granules into the puddle is stopped just prior to reaching the tie-in point. The arc continues a short distance, creating an overlapping protuberance at the tie-in that is free of granules at the surface. This protuberance can be easily ground smooth with the remainder of the hardfacing.
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Cited Art Landscape
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