| 摘要 |
A threaded pipe fitting which is fabricated from two pieces of pipe or other cylindrical tubing or stock. The upper piece of pipe is relatively thick, so that pipe threads (either internal or external) may be machined therein without unduly weakening the fitting; also, a seat is provided at the other end of the thick pipe, typically by machining. The second piece of pipe has an outer diameter which is less than that of the first piece, but greater than the internal diameter of the first piece; that is, the two pieces cannot be telescoped with respect to each other, except for that small distance made possible by the step of machining said seat. The second piece of pipe will usually be much thinner than the first piece, too. The two pipe sections are assembled by physically engaging them in an end-to-end fashion, with an appropriately prepared end of the smaller pipe mating with the machined seat in the larger pipe. The two pipes are rigidly held together and sealed with at least one circumferential weld, which is preferably external. The free end of the smaller pipe has a radius or shape cut therein so that the fitting may fit flush against a run pipe or other structure, for being welded to same.
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