Metal working – Method of mechanical manufacture – Combined manufacture including applying or shaping of fluent...
Patent
1989-11-17
1991-07-30
Gorski, Joseph M.
Metal working
Method of mechanical manufacture
Combined manufacture including applying or shaping of fluent...
2940218, 29458, 29460, 295272, 29DIG7, 29DIG48, 228147, 228202, 427433, B23P 1700, B05D 118
Patent
active
050350420
ABSTRACT:
An improved method of manufacturing galvanized steel tubing from steel strip having at least one galvanized surface, which surface becomes the exterior surface of the tubing is provided. In the method of the invention, after the steel strip is roll-formed and welded to complete the tubing and the welded seam is scarfed to remove irregularities, a quantity of an acid solution is applied to substantially only the scarfed area to react with oxidized metal, and then rinsed, leaving the non-scarfed galvanized exterior surface intact. The tubing is then heated to a temperature sufficient to cause the galvanized coating of the exterior surface to begin to flow and the tubing is regalvanized to produce an improved galvanized exterior surface, which is resistant to cracking along the scarfed area. Also provided is an apparatus for applying a pickling acid solution to substantially only the scarfed area of continuously formed tubing, which apparatus may be used to modify conventional continuous roll-forming mill tubing production lines to perform the method of the invention.
REFERENCES:
patent: 1336886 (1920-04-01), Callender
patent: 1343493 (1920-01-01), Bennett
patent: 1424171 (1922-08-01), Lee
patent: 1623294 (1927-04-01), Williams et al.
patent: 2286745 (1942-06-01), Liebhafsky
patent: 2500568 (1950-03-01), Puschel et al.
patent: 2597893 (1952-05-01), Nordquist
patent: 3226817 (1966-01-01), Simborg et al.
patent: 3259148 (1966-07-01), Krengel et al.
patent: 3271850 (1966-09-01), Menne et al.
patent: 3559280 (1971-02-01), Mailhiot et al.
patent: 3561096 (1971-02-01), Krengel et al.
patent: 3927816 (1975-12-01), Nakamura
patent: 3956537 (1976-05-01), Raymond
patent: 4082212 (1978-04-01), Headrick et al.
patent: 4124932 (1978-11-01), Rogove et al.
patent: 4505760 (1985-03-01), Itoh et al.
patent: 4621399 (1986-11-01), Qureshi et al.
Maitra Kalyan K.
Patel Vijay B.
Allied Tube & Conduit Corporation
Gorski Joseph M.
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