Metal working – Method of mechanical manufacture – Repairing
Patent
1993-09-09
1995-08-01
Hughes, S. Thomas
Metal working
Method of mechanical manufacture
Repairing
294011, 2940211, 2940216, 2940219, 228119, 138 96T, 138 97, 138DIG6, 285 15, 285390, B23P 600
Patent
active
054370868
ABSTRACT:
A method of making a bi-metal pipe section, and especially reclaiming a used or damaged pipe section by making it into a bi-metal pipe section which resists corrosion. The bi-metal pipe section is used in constructing a pipe line or production tubing that resists corrosion at the pipe coupling where corrosion is especially prevalent in fluid conduits. The bi-metal pipe section is fabricated by first removing an annular marginal end of a length of the pipe section of the prior art, to provide a long length of pipe having a partially threaded cut end opposed to an opposite end. Next, an annular short length of pipe is axially aligned and butt welded to the cut, end of the long length of pipe. The short length of pipe preferably is an annular metallic alloy having greater resistance to corrosion respective to the long length of pipe. Next, the pipe section is placed in a turning lathe and threads are formed on the marginal end of the bi-metallic pipe, with the threads extending along the marginal cut end and along the short end of the bi-metallic pipe. The pipe section therefore has some of the original threads left at the opposed marginal ends thereof and therefore the new threads formed on the short end of the bi-metallic pipe must be a continuation of the old threads found on opposed ends of the first recited length of pipe.
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Bates Marcus L.
Hughes S. Thomas
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