Stock material or miscellaneous articles – All metal or with adjacent metals – Helical or with helical component
Patent
1992-06-15
1999-09-28
Zimmerman, John J.
Stock material or miscellaneous articles
All metal or with adjacent metals
Helical or with helical component
428612, 428677, 428685, 138142, 138143, 138144, F16L 902, F16L 918, B32B 108
Patent
active
059586028
ABSTRACT:
A multi-walled steel pipe includes at least two pipe bodies of different diameters. The two pipe bodies are overlapped with one another. Either the inner surface of the outer pipe body or the outer surface of the inner pipe body is a rough surface having a roughness of 10 to 30 .mu.m. The rough surface is made by brasting, etching, or brushing or by the use of rolls. At least one of the overlapping surfaces is plated with copper to provide a brazing layer by which the overlapping surfaces are brazed together. The pipe bodies are double-walled stainless pipes, seamless stainless pipes, or electroseamed pipes.
REFERENCES:
patent: 2104884 (1938-01-01), Quarnstrom
patent: 2375661 (1945-05-01), Karmazin
patent: 2529884 (1950-11-01), Reynolds
patent: 3091262 (1963-05-01), Donaldson
patent: 3584655 (1971-06-01), Frank
patent: 3610290 (1971-10-01), Anderson
patent: 4244482 (1981-01-01), Baumgart et al.
patent: 4723602 (1988-02-01), Huigen et al.
patent: 4862549 (1989-09-01), Criswell
Howard H. Manko, "Solders and Soldering", McGraw-Hill Book Co., 1964 (No Month), pp. 173-174.
Metals Handbook, 9.sup.th Ed., vol. 6 "Welding, Brazing, and Soldering", American Society for Metals, Metals Park, OH, 1983 (No Month), pp. 937-938 .
Budzyn Ludomir A.
Casella Anthony J.
Hespos Gerald E.
Usui Ko Kusai Sangyo Kaisha Limited
Zimmerman John J.
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