Clamshell mounted pipe nozzle weld milling machine with centering apparatus
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United States of America Patent
Stats
-
Mar 2, 1993
Grant Date -
N/A
app pub date -
Apr 8, 1991
filing date -
Apr 8, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A portable lathe especially designed to remove overlay welds used as a temporary fix to slow the propagation of IGSCC at the joints between pipes and nozzles in nuclear boiling water reactor systems comprises a clamshell-type portable machining lathe having a tool translating mechanism affixed to the rotatable portion of the clamshell where the tool translating mechanism provides both radial and axial movement of the tool bit relative to the weld material to be removed. To accommodate an arcuate surface of the nozzles, the tool translating mechanism includes a cam track whose profile or contour parallels that of the surface from which the weld material is to be removed. Completing the assembly is a positioning device which allows the clamshell to be precisely positioned on the pipe where the central axis of the clamshell is coincident with the center line of the pipe on which it is mounted and the plane of the clamshell is perpendicular to the pipe.
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